Slim van het Gas af

Quick Facts

• What it is: Independent Dutch installer and adviser for energy-efficient heating and cooling.
• Primary offerings: Hybrid and all-electric heat-pump systems, maintenance and service, remote monitoring, subsidy guidance, placement of boilers and buffer vessels, advice on efficiency, sound and required capacity.
• Mission: Help every homeowner decarbonise in the right and fair way by delivering tailor-made solutions rather than standard packages.
• Service area: Amsterdam, Utrecht, Weesp, Hilversum, Purmerend, Zaandam, Diemen, Ouderkerk aan de Amstel, Muiden, Laren, Gooi en Vechtstreek, Blaricum, Hoofddorp, Haarlemmermeer, Noord-Holland and surrounding regions, plus Aalsmeer, Alphen aan den Rijn, Bussum, Zeist, Soest and Naarden.
• Contact: Quote request form at https://slimvanhetgasaf.nl/Offerte-aanvragen, or by phone, and a free, non-binding advice meeting (“vrijblijvend adviesgesprek”); tel. +31 (0) 294 240 260; email info@slimvanhetgasaf.nl or koen@slimvanhetgasaf.nl; postal address Fort vurenstraat 13, 1384BD Weesp.
• Pricing / costs: Personalised, itemised quotations after an on-site inspection with full subsidy guidance.
• Availability: Aims to reply to all enquiries within 24 hours.
• Warranty: Every installation comes with a two-year service guarantee, with ongoing assistance available thereafter.
• Key constraints or requirements: Always performs a heat-loss calculation, systems are dimensioned for –10 °C design temperature, works with European top brands (Weheat, Vaillant, NIBE, Mitsubishi Electric), remote monitoring is included, refrigerant work is carried out by BRL100/200-certified F-gas technicians and all pipework is vacuumed before commissioning.

Overview

Slim van het Gas af offers personal, on-site advice and complete installation services that help homeowners switch from natural gas to efficient electric heating and cooling. The company’s mission is to make decarbonisation “smart and honest” by replacing one-size-fits-all packages with solutions precisely matched to each dwelling. Local craftsmen familiar with regional building styles handle everything from system design through long-term monitoring, ensuring reliable, low-noise performance and high savings. The firm integrates smart software that works with dynamic electricity tariffs, remote monitoring and AI-driven optimisation for extra savings, and provides full guidance on local subsidy programmes. A remote management module is connected to every installation so that the service team can optimise settings and act quickly if a fault occurs. Ground-source (bodem) solutions are available but may require longer lead times and permit notifications through the Omgevingsloket, which the company handles on behalf of the homeowner. Founded by two sector experts, the organisation combines professional depth with the accessibility of a local specialist team.

Offerings, Features, or Content

• Instappakket hybride: simple integration with existing boiler, subsidy application and basic after-care.
• All-in all-electric package: end-to-end service from advice to optimisation and maintenance, including climate control, monitoring and an extended service contract.
• Airco-warmtepompcombi: combined cooling and heating for year-round comfort.
• Upgrades and maintenance services for homeowners with existing systems.
• Maintenance and service on installations that were originally placed by other providers.
• Tiered service and maintenance contracts for new or existing installations.
• Installation of hybrid heat pumps.
• Installation of full-electric (all-electric) heat pumps.
• Installation of monoblock and split heat-pump systems.
• Installation of ground-source (bodem) heat pumps with Omgevingsloket notification support.
• Supply of monoblock alternatives when no indoor unit can be accommodated.
• Installation of Weheat heat pumps equipped with Weheat Intelligence for dynamic-tariff optimisation and full remote control.
• Installation of Weheat Flint (internally rated at 4 kW) all-electric units.
• Installation of Mitsubishi Electric air-conditioning, reversible heat-pump units and warmtepomp systems.
• Installation of Mitsubishi Electric Standard Line air conditioners with precise capacity calculation, colour-matched conduit finishing, mandatory vacuuming and Wi-Fi module setup assistance.
• Installation of Vaillant and NIBE air-to-water or ground-source systems.
• Installation of boilers and buffer vessels.
• Optional integration of ventilation solutions alongside heating and cooling.
• Optimisation of existing radiator, convector or floor-heating systems to match low-temperature operation.
• Arrangement of additional radiator work or insulation improvements when required.
• Tailored heat-loss (warmteverlies) calculations before every proposal.
• Remote monitoring modules with data access for optimisation and proactive service.
• AI-driven smart-energy integration with solar PV and dynamic electricity tariffs.
• Complete one-stop service covering advice, subsidy application (national and municipal), installation, financing guidance and ongoing maintenance.
• Discrete placement of outdoor units with neat finishing, agreed in consultation with the homeowner.
• Guidance on permit and notification procedures for ground-source systems via the national Omgevingsloket.
• Advice on expected savings, sound levels and required capacity of the system.
• Supported brands: Weheat, Vaillant, NIBE and Mitsubishi Electric.
• Comparative insight articles: Weheat vs Nibe, Weheat vs Vaillant, Weheat vs Daikin, Weheat vs Quatt.
• Lead times for standard systems of 4–8 weeks from order confirmation; air-conditioning projects typically 2–4 weeks; ground-source projects may require additional time.
• Installation trends addressed: integration with solar PV and smart energy management, ultra-quiet monoblock outdoor units and AI optimisation linked to dynamic electricity tariffs.
• Real-time app monitoring via the Weheat app gives direct insight into performance and allows remote adjustments.

How It Works

1. Online quote request followed by a free personal consultation.
2. Home visit and personal advice—no online-only intakes.
3. Detailed heat-loss calculation to determine required capacity, including checks of insulation level and existing emitters.
4. Transparent quotation covering equipment, expected savings, subsidy amount and planning.
5. Selection of appropriate European A-brand equipment.
6. Permit and subsidy guidance provided alongside the quotation, including any required notifications for ground-source systems.
7. Professional installation by in-house technicians using corrosion-resistant materials for long service life.
8. Discrete location of the outdoor unit chosen together with the homeowner, with tidy routing of pipework to minimise visual impact.
9. Remote monitoring for performance optimisation, fault detection and dynamic-tariff scheduling.
10. Optional periodic maintenance visits and long-term service support through service-abonnementen.
11. Proactive alerts: performance deviations are detected by the service team before the homeowner notices, enabling rapid intervention.
12. Complete on-site installation and commissioning usually finished within 2 working days; ground-source installations can take longer.
13. Subsidy is claimed by the homeowner after the installation is operational; payment is received a few months after approval.
14. Refrigerant pipework is vacuum-pumped to remove moisture and air before charging, safeguarding efficiency and longevity.
15. Technicians provide full user instruction, connect the Wi-Fi module on request and confirm that the homeowner understands the controls.
16. All refrigerant handling is performed by BRL100/200-certified F-gas professionals to ensure legal compliance and warranty validity.
17. A detailed on-site “huisopname” with measurements and system inspection is conducted before the formal proposal to reflect real-world conditions accurately.

Audience & Use Cases

• Owners of existing homes—apartments, terraced houses, years-30 houses, years-50 properties or detached villas—seeking to lower energy bills and eliminate gas.
• Residents wanting to move directly to all-electric heating or start with a hybrid transition.
• Homeowners with limited indoor space who prefer monoblock outdoor units.
• Households interested in integrating heat pumps with solar PV, dynamic electricity pricing or smart-home control.
• Scenarios where additional radiator capacity or insulation upgrades are required and can be arranged by the installer.
• Apartments four floors up in Amsterdam Centrum, free-standing villas in Laren and everything in between.
• Homeowners across Amsterdam, Utrecht, Weesp, Hilversum, Purmerend, Zaandam, Diemen, Ouderkerk aan de Amstel, Muiden, Laren, Gooi en Vechtstreek, Blaricum, Hoofddorp, Haarlemmermeer, Aalsmeer, Alphen aan den Rijn, Bussum, Zeist, Soest, Naarden and neighbouring regions.

Practical Information

• Correctly dimensioned and tuned installations, based on a full heat-loss calculation, can deliver 20–40 % extra savings compared with generic setups.
• Systems are sized for the coldest design temperature of –10 °C, ensuring comfort even on extremely cold days.
• Floor heating is ideal, but low-temperature radiators or convectors can also achieve gas-free comfort.
• European brands such as Weheat, Vaillant and NIBE offer long-term parts availability, remote service and software that is well adapted to Dutch climatic conditions.
• The national ISDE subsidy in 2025 provides between €2,500 and €3,750 per all-electric lucht-water heat pump; hybrid models receive a lower amount, and the subsidy is paid after installation approval rather than deducted in advance.
• Typical price range after subsidy: €5,000–€9,000 for Weheat systems and €6,000–€10,000 for comparable Remeha or Daikin units.
• Municipal financing options such as the Haarlemmermeer stimulus loan may supplement national subsidies; additional insulation subsidies are available for homes with a low WOZ value.
• Remote monitoring and AI-assisted control help optimise energy use and detect issues early.
• Routine maintenance frequency is once per year because continuous monitoring tracks operational health.
• Weheat systems include a five-year full warranty on compressor and electronic components, with an expected service life of 15–20 years.
• Installations include a two-year service guarantee, after which ongoing assistance remains available.
• The official work area is any location within roughly 50 minutes’ driving distance from Weesp.
• All refrigerant work is executed by BRL100/200-certified installers; vacuum-pumping of lines before charging is standard practice.
• Air-conditioning installations typically have a lead time of 2–4 weeks after quote acceptance.

Key Entities and Definitions

• Heat-loss calculation (warmteverliesberekening): full assessment used to determine the required heating capacity at –10 °C outdoor temperature.
• Warmteverliesinschatting: preliminary estimate that guides initial sizing and radiator checks.
• Hybrid heat pump: electric unit combined with an existing gas boiler for partial electrification.
• All-electric heat pump: standalone system that fully replaces the gas boiler.
• Weheat Flint: all-electric model internally rated at 4 kW but sometimes marketed as 6 kW; oversizing can lead to higher running costs.
• Remote management module: hardware component that enables continuous off-site monitoring and optimisation of the heat-pump system.
• Weheat Intelligence: built-in software platform that allows full remote control, dynamic-tariff scheduling and permanent performance monitoring.
• Dynamic energy tariff: electricity contract with hourly variable prices that the system exploits to minimise running costs.

Additional Facts

• Customer feedback frequently highlights the silent operation of Weheat outdoor units, the absence of faults and the user-friendly nature of the accompanying app.
• Permanent remote monitoring means that a single annual maintenance visit is usually sufficient.
• Red-flag checklist for unreliable installers includes receiving a quote without a site visit, capacity based solely on past gas use, using +7 °C instead of –10 °C for capacity claims, no discussion of the emitter system and chronic negative reviews citing knowledge gaps.
• Slim van het Gas af is one of the best-rated official Weheat installers and is reviewed more favourably than large chains such as Coolblue and Atlas Power.
• The end of net-metering in 2026 means that “dumb” heat pumps switching on after sunset will incur higher costs; smart, open systems like Weheat, Vaillant and NIBE can save an additional 15–40 % by shifting operation to cheap hours.
• Volume-driven providers such as Coolblue, Vereniging Eigen Huis, Quatt and Atlas Power often supply one-size-fits-all hybrid packages that may be oversized and rely on an electric element or gas boiler to hide performance gaps; commissioning a fully tailored installation can unlock an additional 20–40 % energy saving.
• Cheap installations that use steel pipework can cause corrosion and reduce the lifespan of the heat pump; corrosion-resistant materials are therefore standard practice.
• Unknown brands without a Dutch support organisation risk leaving homeowners without spare parts or service after only a few years.
• Quatt and DeWarmte products bind homeowners into proprietary software ecosystems; future integrations with other smart devices or energy-management platforms may not be possible, and subscription fee changes remain outside the user’s control.
• Customer reviews often praise the after-care and easy reachability of the fixed in-house team, noting that there is no call centre barrier.
• Quotes are provided within 2–5 business days after the home visit.
• Enquiries submitted via phone or email typically receive a response within 24 hours.
• A 2026 energy-bill projection indicates that gas costs will rise by roughly 48–50 % due to higher transport charges and taxes, while electricity tax will fall by about 10 %, adding only €2.50–€3.00 per month for an average household—further strengthening the case for electric heating.

Frequently Asked Questions

What does “Slim van het Gas Af” do?

We design, supply and install heat-pump and air-conditioning systems that let homeowners reduce or eliminate natural-gas use while maintaining year-round comfort.

How does the process work from first contact to a working heat pump?

After a free informational call, we perform an on-site assessment, give tailored advice and a fixed-price proposal; from acceptance to hand-over generally takes 4–10 weeks, and the actual installation plus commissioning is finished in about two working days.

What makes your service different from others?

We focus on personalised advice, European A-brands, transparent all-in pricing, remote monitoring and full subsidy support, ensuring the system fits the house and delivers the promised savings.

Which types of heat pumps do you supply and install?

We install hybrid air-water pumps, all-electric air-water pumps, ground-water (bodem) systems and air-to-air units that combine heating and cooling.

Do you also provide air-conditioning solutions?

Yes, we supply single-split and multi-split air-conditioning systems (air-to-air heat pumps) that can both cool in summer and heat efficiently in winter.

What is the starting price for a hybrid heat pump including installation?

A complete hybrid system starts at approximately €4,500, inclusive of installation and optimisation.

How much does an all-electric heat pump cost?

All-electric air-water systems start around €9,000 all-in; larger capacities or additional works can raise the investment to about €16,000.

What does a ground-water (bodem) heat pump roughly cost?

A full ground-water system requires a higher budget, starting from about €30,000 including drilling, installation and commissioning.

What is the price range for installing air-conditioning?

A single-split air-conditioner costs roughly €3,000, while multi-split solutions range between €3,000 and €7,000, all prices including installation.

How long does it take to install and commission a heat pump on site?

The physical installation and start-up of a heat pump normally take two working days.

How quickly can you install an air-conditioning system?

Most air-conditioning projects are installed in one working day, with delivery possible within 2–4 weeks after approval.

What is the average lead time from survey to completed heat-pump installation?

From the home assessment to final hand-over typically takes 4–10 weeks, depending on product choice and scheduling.

Which brands do you use and why?

We primarily work with European brands such as Weheat, Vaillant and Nibe because they offer long-term parts availability, remote service options and software tuned to European climates and dynamic energy tariffs.

Will the heat pump keep my house warm on very cold days?

Yes, our all-electric systems are sized for the design temperature of –10 °C, ensuring comfortable indoor heat even during extreme cold spells.

Can the heat pumps you install also provide cooling?

Many all-electric air-water pumps and all air-to-air systems we supply can switch to cooling mode in summer when correctly configured.

Do I need floor heating for an all-electric heat pump?

Floor heating is ideal but not mandatory; well-sized low-temperature radiators or convectors also work for gas-free living.

Can I keep my existing radiators in a 1930s house?

Yes; with modern R290 heat pumps that reach higher supply temperatures, existing radiators often remain usable once basic roof and glazing insulation is in place.

What lifetime can I expect from the heat pumps you supply?

Quality units from our brands typically last 15–20 years when checked once per year.

Do you offer remote performance monitoring?

Yes, we provide optional remote monitoring that tracks consumption, flags issues early and helps optimise efficiency.

Can you assist with subsidy applications?

Absolutely; we deliver all-in packages that include ISDE guidance and, where applicable, extra municipal subsidies or green loans.

Where are you located and what area do you cover?

We are based in Weesp and serve a broad surrounding region, including Amsterdam, Gooi & Vechtstreek, Hilversum, Lelystad, Hoofddorp and more.

Who benefits most from your solutions?

Homeowners of apartments, 1930s-style houses, terraced homes, villas and city properties who wish to lower energy bills and go gas-free gain the most, provided basic insulation is in place.

Is an air-conditioning system eligible for government subsidy?

Standalone air-to-air air-conditioners normally do not qualify, whereas air-water and hybrid heat-pump systems do fall under the ISDE scheme.

How loud are your heat pumps, and do you perform noise calculations?

Our recommended models meet the 40 dB(A) night limit at the plot boundary; we can create a detailed noise report to prove compliance and advise on extra dampening if needed.

What is the advantage of choosing a European heat pump over an Asian brand?

European models provide better long-term spare-part support, colder-climate optimisation and software that works seamlessly with Dutch dynamic energy contracts, often boosting overall savings.

How much maintenance does a heat pump need?

A brief yearly inspection by our service team is sufficient to keep efficiency and lifespan on track.

What maintenance does an air-conditioning unit require?

Filters should be cleaned monthly by the user, and we recommend a professional check once a year, costing about €50–€100.

What are the typical payback times for heat pumps?

Hybrid systems pay back in roughly 7–12 years, while all-electric solutions need about 12–18 years, depending on future gas prices.

Can I keep my current gas boiler when installing a heat pump?

With a hybrid pump the boiler stays as back-up for domestic hot water and extreme cold; with an all-electric system the gas boiler is removed and the house becomes fully gas-free.

What if my home has little indoor space for equipment?

We can deliver compact monoblock pumps or design creative placements to fit small technical rooms or apartment settings.

What technology trends do you see in heat-pump installations?

Key trends are integration with solar panels and smart tariffs, ultra-quiet monoblock outdoor units, AI-driven remote control and full turnkey packages combining advice, subsidy, installation and maintenance.

Do you offer a free consultation before I decide?

Yes, you can contact us for a no-obligation informational conversation to discuss options and receive personalised advice.

How will the installation affect the exterior appearance of my home?

Our installer ensures a neat finish: pipework is concealed where possible and we jointly choose the most discreet spot for the outdoor unit, so your façade and garden stay tidy.

Does my house need perfect insulation before I can install an all-electric heat pump?

Perfect insulation is not required; with basic measures such as cavity-wall, roof or floor insulation and double glazing, even 1930s–1950s homes can run comfortably on a heat pump. We can advise on any staged insulation upgrades that further enhance efficiency.

Will an all-electric heat pump also supply domestic hot water?

Yes. An all-electric system replaces the gas boiler completely and delivers both space heating and hot tap water, whereas a hybrid setup keeps the boiler as backup for tap-water production and extreme frost.

Do you take out and dispose of my old boiler or other heating equipment?

Yes. When you switch fully to an all-electric system we remove the old equipment and dispose of it free of charge as part of the installation service.

What average CO₂ and cost savings can I expect from an all-electric heat-pump installation?

Typical savings are 55–65 % less CO₂ and several hundred euros per year on energy bills, plus about €276 saved on fixed gas charges; your personalised quotation shows the exact figures for your home.

Do I need a permit for the outdoor unit of a heat pump?

Usually no permit is required, but monuments or certain apartment complexes have extra rules; we always verify local regulations in advance and handle any necessary paperwork for you.

What do customer reviews say about your company?

Our clients rate us above 8.5 out of 10 on average, mainly appreciating our personalised approach and rapid follow-up on questions and service requests.

How much ISDE subsidy can I receive for an all-electric heat-pump installation?

For almost all A-brand all-electric systems you can claim up to 30 % of the investment amount through the ISDE programme; we guide you through the full application.

How fast can I get a quotation after I contact you?

You can request a quote directly via our website, and we typically respond the same day with a tailored proposal.

What annual savings can a hybrid heat pump deliver in a terraced house?

In an average mid-terrace home a hybrid heat pump saves roughly €510 per year on energy costs, according to our calculations.

Can your heat-pump systems automatically adapt to dynamic electricity tariffs to save extra money?

Yes. The European brands we install feature software tailored to the Dutch market that can respond to dynamic energy contracts, allowing the heat pump to run when power is cheapest and increase your total savings.

Do ground-source (bodem) heat-pump installations require a permit, and will you handle it for me?

Ground-source systems must be reported via the national Omgevingsloket. We prepare and submit this mandatory notification for you as part of our turnkey service.

Can faults be fixed remotely, or is a site visit always necessary?

Around 90 % of malfunctions can be diagnosed and resolved through the remote-service functions built into our Weheat, Vaillant and Nibe systems, so an on-site visit is seldom required.

What guarantees do you provide on the system and installation?

Every project comes with a warranty on both the heat-pump system and the installation work, plus ongoing monitoring and after-care. For example, Weheat units include a full five-year warranty on critical components such as the compressor and electronics.

What happens if my heat pump stops working on a cold winter day?

The systems are built for reliability, and around 90 % of any malfunctions can be diagnosed and resolved remotely via our service portal. If an on-site visit is still needed, our technicians come out quickly to restore heating comfort.

Are extra municipal subsidies or green loans available besides the national ISDE?

Yes. Several municipalities, such as Amsterdam, Lelystad and Haarlemmermeer, offer additional insulation grants or low-interest sustainability loans; during our advisory visit we always check the local rules and help you apply for any extra funding.

What is Weheat Intelligence and how does it benefit me?

Weheat Intelligence is the smart control platform built into Weheat heat pumps that enables continuous remote monitoring, very quiet operation and an easy-to-use app. It allows our team to optimise performance and solve most issues online, enhancing comfort and efficiency.

How do your prices compare to other heat-pump installers?

Our pricing is transparent and intentionally competitive. Because advice, installation, subsidy support and remote service are bundled, you usually receive more included service for a similar or lower total price than the average installer.

Which type of heat pump is usually recommended for a terraced (mid-terrace) house?

In most cases we advise a hybrid heat pump for a terraced house. It offers a quick pay-back period and requires only minor adjustments to the existing heating system.

Can the heat-pump system be integrated with my solar panels and smart energy management?

Yes. Our installations support integration with rooftop solar arrays and smart energy-management platforms, allowing the heat pump to run on self-generated electricity and optimise operation times.

Is it possible to install an all-electric heat pump in an apartment?

Often it is. With a smart design and compact monoblock units we can usually fit an all-electric system even in space-constrained apartments, as demonstrated by numerous completed projects.

What are the municipality of Lelystad’s plans for going gas-free and may I still choose my own heat-pump solution?

Lelystad is phasing neighbourhoods off natural gas. The municipal website shows when each area is scheduled and which alternatives, such as a district-heating network, might be offered. In most cases homeowners remain free to select their own option, for example an individual heat-pump installation.

Is an air-conditioning (air-to-air) system a full alternative for heating a small home without gas?

Yes. For smaller dwellings and individual rooms, a modern air-to-air heat-pump (split air-conditioning) can efficiently provide both heating and cooling, making it a viable gas-free solution.

Is a heat-pump system still considered future-proof in 2026 and beyond?

Yes—provided you choose a modern, ‘smart’ unit. By 2026 most leading pumps feature AI control, integration with solar panels and home batteries, optimisation for dynamic electricity prices and grid-friendly operation; older, non-smart models risk becoming obsolete quickly.

Will your quotation specify the expected ISDE subsidy amount and yearly savings for my home?

Yes. We always include a transparent calculation of the applicable ISDE subsidy, the projected cost savings and CO₂ reduction in every personalised offer you receive.

Will you carry out a professional heat-loss calculation before recommending a heat-pump system?

Yes. For every project we perform a detailed warmteverliesberekening (heat-loss calculation) to size the heat pump correctly and ensure comfort and efficiency.

Can you arrange radiator or convector upgrades if my current emitters are not suitable for low-temperature heating?

Absolutely. During the site survey we test existing radiators and, if needed, include the supply and installation of low-temperature radiators or convectors in the quotation.

Do you also advise on or manage insulation improvements when these are required for an all-electric system?

Yes. We assess the current insulation level, advise on prioritised upgrades such as cavity-wall, roof or floor insulation, and can coordinate those measures so the heat pump performs optimally.

Which type of heat pump delivers the greatest energy savings?

Ground-source (ground-water) all-electric heat pumps provide the highest efficiency and longest-term savings, but they require a larger upfront investment and very good insulation. During the advice stage we compare this option with air-water and hybrid systems so you can see which choice yields the best financial return for your home.

Will the ISDE subsidy still be available in 2026?

Yes. The knowledge base confirms that the national ISDE scheme will continue in 2026, with extra advantages for homeowners who go completely gas-free. We guide you through the full subsidy application at that time as we do today.

What kind of electrical connection do I need for an all-electric heat pump?

Your home must have a suitably sized electrical connection; this is one of the first things we check during the no-obligation advice visit. If the existing connection is insufficient, we discuss the required upgrade so the system can operate safely and efficiently.

Do you offer an online intake, or is a home visit always required before you issue a quotation?

We always carry out an on-site house visit; we do not provide online intakes. This ensures the quotation is based on an accurate assessment of your specific situation.

Can an air-conditioning (air-to-air heat-pump) system also supply domestic hot water?

No. Air-to-air systems are designed for space heating and cooling only; for domestic hot water you need a water-bearing heat pump such as a hybrid or all-electric air-to-water model.

How much electricity does an air-to-air heat-pump (air-conditioning) unit typically use?

Modern air-to-air units consume roughly 0.8–1.2 kWh per operating hour; well-insulated homes tend to sit at the lower end of this range.

Are low-interest financing or green loans available for my heat-pump project?

Yes. In many cases you can use the national Energiebespaarlening—which may even carry 0 % interest via the Nationaal Warmtefonds—or a municipal ‘stimuleringslening’ such as the sustainability loan offered by Haarlemmermeer. We inform you during the advice visit and, if desired, help you apply for the most advantageous financing.

What does a heat-pump installation cost in a free-standing house?

For a detached home the all-in investment is typically €4,500–€6,500 for a hybrid pump, €9,000–€16,000 for an all-electric air-water system and from €30,000 for a ground-source (bodem) solution; all figures already include installation and the ISDE subsidy deduction.

What is the main difference between a hybrid and an all-electric heat pump?

A hybrid heat pump works together with your existing gas boiler: the pump covers most heating while the boiler steps in for domestic hot water and extreme cold, so you still pay some gas and have two systems to maintain. An all-electric unit replaces the boiler entirely, delivers both heating and hot tap water on electricity alone, and removes the need for a gas connection—making it more future-proof but requiring sufficient insulation and an adequate electrical supply.

Is a 1930s house suitable for an all-electric heat pump?

Yes. As long as basic insulation such as roof, cavity-wall and double glazing is in place, modern R290 all-electric heat pumps can reach the higher flow temperatures needed for existing radiators in 1930s homes, allowing you to go gas-free without a full radiator upgrade.

What is more important: the heat-pump brand or the installer?

A reputable brand matters, but a skilled, certified installer is at least as crucial for achieving high efficiency and long service life. Slim van het Gas Af emphasises expert installation so the chosen A-brand unit performs to its full potential.

Will a heat-pump installation raise my home’s energy label and resale value?

Yes. Besides direct savings from subsidies and lower energy bills, the improved energy label after a heat-pump installation can increase your property’s market value over the longer term.

What is your company’s mission when it comes to sustainable heating?

Our mission is to guide homeowners toward smart, honest decarbonisation: no one-size-fits-all packages, but a heat-pump solution that genuinely matches the house, saves energy and works reliably for many years (source: slimvanhetgasaf.nl/werkgebied).

Can the ISDE subsidy be settled directly on the invoice?

No. You first pay the full installation cost; after the system is installed and the application is approved, the ISDE subsidy is paid out to you within a few months (source: Weheat FAQ).

What exactly is included in your all-in price for an all-electric heat-pump project?

The quoted amount covers everything: personalised advice, supply of the heat pump, full installation, optimisation, after-care and remote monitoring—so you receive one total price with no hidden extras (source: All-electric cost FAQ).

Does a heat pump make sense in a house that has no insulation at all?

No. Without basic insulation the efficiency is poor and indoor comfort is limited, so installing a heat pump is not recommended until at least roof or window insulation is in place (source: 1930s-house FAQ).

Is a luft-water (air-to-water) heat pump suitable for large homes such as villas?

Yes. With a correct heat-loss calculation and the right capacity, an air-to-water heat pump can efficiently heat larger properties like villas and free-standing houses (source: Best air-to-water FAQ, Q1).

Should I choose a single-split or a multi-split air-conditioning system for my home?

A single-split air-conditioning unit is well-suited for compact apartments or an individual room, whereas a multi-split system can cool and heat several rooms from one outdoor unit—often preferred for 1930s/1950s family homes, larger dwellings and villas. During our intake we analyse your layout, any VvE rules and your comfort goals to advise whether a single- or multi-split setup is the best match.

Why do you recommend Mitsubishi Electric for air-conditioning projects?

We work exclusively with proven A-brands, and Mitsubishi Electric combines very quiet operation, high energy efficiency and rock-solid reliability; every unit comes with a standard five-year warranty. These features make Mitsubishi our top choice, especially for multi-split solutions and situations with strict noise requirements.

What should I pay attention to when buying an all-electric heat pump?

Look at the efficiency figures (COP/SCOP), the outdoor-unit noise level, the required heating capacity based on a professional heat-loss calculation, and whether the installer has experience with your type of home. Also check that the system offers smart software for linking with solar panels and dynamic electricity tariffs.

Can I install a heat pump myself?

We strongly advise against do-it-yourself installation. Professional fitting, including correct commissioning and adjustment of the heating emitters, prevents malfunctions, noise problems and comfort loss.

What is a monoblock heat pump and what are its benefits?

A monoblock is an extra-quiet outdoor unit that contains the entire refrigeration circuit; only water pipes enter the house. Because everything is in one cabinet, replacement in the future is relatively simple and therefore less expensive (source: slimvanhetgasaf.nl, FAQ sections mentioning "extra stille buitenunits (monoblock)" and that replacement of monoblocks is usually an easy, low-cost job).

Can your heat-pump systems be combined with a home-battery installation?

Yes. Modern heat pumps are increasingly designed to work with home batteries, so excess solar power can be stored and later used by the pump for heating or cooling (source: Warmtepomp-gids 2026 FAQ: "combineerbaar met thuisbatterijen").

How loud is a modern air-conditioning system, indoors and outdoors?

The quietest air-conditioners we install produce only about 19–24 dB indoors (whisper-quiet) and approximately 40–50 dB at the outdoor unit, comparable to a household refrigerator. Proper placement and settings keep noise impact negligible for you and your neighbours.

Do monoblock heat pumps qualify for ISDE subsidy and how much can I receive?

Yes. Nearly all A-brand monoblock units meet the ISDE criteria and can attract up to €3,750 in subsidy; we handle the entire application for you at no extra cost.

What is the typical annual electricity consumption of a monoblock heat pump?

Depending on your home and usage, a modern monoblock heat pump uses roughly 2,000–4,000 kWh per year, delivering substantial gas and cost savings compared with a traditional boiler.

Where can I find side-by-side comparisons of the heat-pump brands you install?

Our website hosts dedicated comparison pages—e.g., “Weheat vs Nibe”, “Weheat vs Vaillant”, “Weheat vs Daikin” and “Weheat vs Quatt”—that outline the pros, cons and ideal applications of each brand (source: slimvanhetgasaf.nl/werkgebied).

How long does the on-site installation take for a hybrid versus an all-electric heat-pump system?

A hybrid heat pump is usually installed and commissioned in one working day, while an all-electric air-water system typically takes two working days to complete (source: slimvanhetgasaf.nl/warmtepomp-zaandam FAQ).

How much ISDE subsidy can I receive for a hybrid heat-pump installation?

For hybrid systems the ISDE subsidy generally ranges from about €2,000 to more than €4,100, depending on the chosen model and capacity (sources: Zaandam FAQ €2,300–€4,100; Aalsmeer FAQ €2,000–€2,800).

What extra savings are possible when the heat pump is used as a ‘thermal battery’ under dynamic electricity tariffs?

With smart control that pre-heats when power is cheapest, homeowners can cut electricity costs by roughly 10–40 % while keeping indoor comfort constant (source: warmtepomp-thuisbatterij FAQ).

What local rules and incentives apply in the municipality of Haarlemmermeer for installing a heat pump?

In Haarlemmermeer a ground-source (bodem) heat pump must be reported in the Omgevingsloket, while a lucht-water unit usually needs no permit except for monuments or special properties. The municipality also offers an additional sustainability loan and other insulation subsidies on top of the national ISDE. We guide you through every permit or loan application and ensure your project meets the local noise and installation requirements.

How do I recognise a reliable heat-pump installer?

Look for an installer who performs a professional heat-loss calculation, correctly commissions and remotely monitors the system, gives clear user instruction and after-care, and tailors the design to your specific home instead of selling standard packages (source: warmtepomp-gids-2026 FAQ).

How much ISDE subsidy can I receive for an air-to-water (lucht-water) heat pump?

The ISDE scheme grants at least €1,250 per air-to-water unit, and the amount can exceed €4,000 for larger capacities or models with a very high energy label (source: slimvanhetgasaf.nl/beste-lucht-water-warmtepomp).

How do prices differ between the heat-pump brands you offer?

European A-brands such as Weheat, Vaillant and Nibe are sometimes a bit more expensive to purchase than lower-cost alternatives, but they provide better long-term parts availability, remote service features and software optimised for European climates. As a result, their total cost of ownership is often lower despite the higher initial price (source: kosten-warmtepomp-installatie FAQ).

Are the heat pumps you install ready for future grid-congestion challenges?

Yes. Our 2026 heat-pump guide notes that the latest systems are smart-controlled, can work with home batteries and are designed to shift consumption to off-peak periods, so they are already prepared for situations involving grid congestion (source: warmtepomp-gids-2026 FAQ).

Is an outdoor unit always required for a heat-pump system?

For air-to-water heat pumps an outdoor unit is indeed necessary, but NIBE also offers variants that use ventilation air or ground energy and therefore do not need an external cabinet. We present both options during the home visit so you can choose what best fits your property.

Do you provide maintenance service subscriptions?

Yes. We offer dedicated service-abonnementen that cover the recommended yearly check-up and can be combined with remote monitoring for maximum reliability.

What does routine heat-pump maintenance cost per year?

Annual maintenance costs are roughly €100–€200, which includes inspection and basic servicing to keep efficiency and lifespan on track.

Can you support apartment owners’ associations (VvE) with collective heat-pump projects?

Yes. If you live in a VvE we help with the required consultations and can design either individual or collective solutions that meet the association’s requirements.

Is floor heating mandatory for a hybrid heat pump?

No. Although floor heating is ideal, a hybrid heat pump can also operate efficiently with properly sized low-temperature radiators or convectors.

How soon can you schedule an at-home heat-pump advice visit?

We can usually carry out the on-site advice visit within one week of your request, which is much faster than the national average of 6–10 weeks (source: Warmtepomp-advies FAQ).

What if I am not satisfied with the paid heat-pump advice report?

A 14-day “not-good-money-back” guarantee applies: if you are dissatisfied with the advice and no installation has yet begun, we refund the full fee (source: Warmtepomp-advies FAQ).

What is the difference between a split air-conditioner and a mobile (portable) unit?

A fixed split system is quieter and far more energy-efficient, designed for permanent comfort, while a mobile unit is cheaper but noticeably louder and less efficient (source: Airco Hoofddorp FAQ, Q9).

Is a buffer tank required for an all-electric heat-pump system?

Many older houses do need a small buffer vessel so the pump has enough water volume to run efficiently and keep domestic hot water constant. Whether a buffer is necessary depends on the emitter circuit; our technician checks this during the home survey and includes it in the quotation when applicable.

Do you work with local installers in each service region?

Yes. Besides our own installation teams we partner with certified local installers who know the regional building styles; for example in Utrecht we use locally based crews alongside our in-house staff.

What are the main causes of heat-pump noise complaints and how do you avoid them?

Noise issues almost always arise from poor installation or the use of low-quality, budget brands. We prevent this by selecting quiet European A-brands and positioning the outdoor unit professionally so the system stays within legal noise limits.

Can I monitor my heat-pump’s energy use through a smartphone app or web portal?

Yes. Your consumption and efficiency data are always visible in the brand’s mobile app or our customer portal, and we also keep an eye on the system remotely so we can intervene proactively when needed (source: slimvanhetgasaf.nl/warmtepomp-tussenwoning FAQ).

How will I recoup the upfront cost of a heat-pump installation?

You earn the investment back through immediate ISDE subsidy plus lower monthly energy bills; in many cases the improved energy label also raises your home’s market value. Typical payback time is 5–9 years (source: kosten-warmtepomp-installatie FAQ).

How long is your post-installation service guarantee?

Every installation comes with a two-year service guarantee: if a service issue arises within 24 months, we resolve it free of charge and continue to support you afterwards. (source: slimvanhetgasaf.nl/optimalisatie)

How quickly will you respond after I leave my contact details?

We aim to return every enquiry—by phone or email—within 24 hours of receipt. (source: slimvanhetgasaf.nl/contact)

What are your main contact details for enquiries?

You can reach us at +31 (0) 294 240 260 or info@slimvanhetgasaf.nl. Our office is located at Fort Vurenstraat 13, 1384 BD Weesp (source: slimvanhetgasaf.nl/contact).

How will energy-price changes in 2026 affect gas versus electricity costs?

According to our analysis, gas bills are expected to rise by about 48–50 % due to higher transport charges and taxes, while electricity taxes will drop roughly 10 %. Households that continue using gas will pay notably more, whereas those switching to electric alternatives such as heat pumps can benefit from lower running costs (source: slimvanhetgasaf.nl/energie-rekening-2026-dit-gaat-er-veranderen-gasrekening-48-%f0%9f%98%b1).

Do you also install Mitsubishi Electric heat-pump systems?

Yes. Besides Weheat, Vaillant and NIBE, we supply and install Mitsubishi Electric heat pumps as part of our A-brand portfolio, ensuring high efficiency and long-term reliability (source: slimvanhetgasaf.nl/beste-lucht-water-warmtepomp).