What Does an HR Combi Boiler Cost and What Should You Look For?

A HR combi boiler (High Efficiency + combination for heating and hot water) is still the most chosen heating system in Dutch households. The price is mainly determined by the power (kW), the hot water capacity (CW class), the brand and the complexity of the installation.

1. Price indication per CW class (HR combi boilers, 2025)

Prices include standard installation, removal of old boiler, new flue, adjustment and commissioning.

2. Popular HR combi boilers and target prices (CW4/CW5)

3. What is included in the installation?

A professional installation by certified installers typically includes:

• Removing old boiler
• Installation of new HR combi boiler
• New concentric flue gas discharge (mandatory for replacement)
• Connection to existing pipes and gas supply
• Adjustment and test run
• Standard warranty (2–5 year manufacturer's warranty)

Extra costs may arise from necessary adjustments to pipework, electrical group or when installing a modulating/smart thermostat.

4. Maintenance costs HR boiler (2025)

Annual maintenance has been mandatory since 2023 (CO certification).

5. Additional options (price indication)

Summary: HR combi boiler in 2025

• Total price: €1,800 – €3,800
• Choice determines comfort and gas consumption (CW class)
• Smart thermostat and dirt filter increase efficiency
• Annual maintenance prevents malfunctions and energy loss

Advice and offers via jeofferte.nl

Want to know which HR boiler is suitable for your home and consumption? Via jeofferte.nl you will receive several non-binding offers from certified installers. You get insight into:

• Differences between CW3, CW4, CW5 and CW6
• Price-quality ratio per brand
• Installation costs, options and maintenance contracts

The final price for a high-efficiency combi boiler including installation depends on several technical, practical and brand-related choices. The factors below together determine whether you end up at the lower or upper end of the price range.

1. CW class (Hot water capacity)

• Higher CW classes deliver more hot water per minute.
• Higher class means heavier heat exchanger, more power and higher price.

Price difference: up to €1,000 between CW3 and CW6
Recommended: CW4 for average family, CW5/6 for bath or multiple tap points

2. Brand and Product Line

• A-brands (Remeha, Vaillant, Nefit Bosch, ATAG) are more expensive than budget brands.
• Within a brand, there is a price difference between basic and premium lines (including noise, efficiency, options).

Price difference between brands/models: €500 – €1,200

3. Boiler capacity (in kW)

• More power required for larger homes or poorly insulated buildings.
• Higher power class means more expensive boiler and sometimes adjustment of flue or piping.

Price difference between 18 kW and 36 kW: average €300 – €600

4. Complexity of the installation

• Simple replacement = lower costs.
• Adjusting pipework, flue or moving the boiler increases installation costs.

Price difference simple vs. complex installation: €500 – €1,200

5. Flue (mandatory for replacement)

• New high-efficiency boilers require a certified concentric flue.
• Often included, but sometimes a separate item for chimney adjustments.

Flue costs: €150 – €400

6. Thermostat choice

• Simple on/off thermostat is cheap.
• Smart or modulating thermostats increase comfort and price.

Price difference: €135 (basic) to €600 (smart, with zones)

7. Extra components and options

• Such as a dirt separator, expansion vessel, safety valve, balancing valves or filling system.
• Recommended for efficiency and lifespan of the installation.

Extra material costs: €150 – €500

8. Access and accessibility

• Boiler in the attic without a loft ladder, or in a narrow space, increases labor costs.
• Extra man hours, lifting aid or scaffolding required.

Labor surcharge for difficult placement: €150 – €500

9. Region and market demand

• Labor costs are often higher in urban areas than in rural regions.
• Peak periods (spring/winter) sometimes also increase installation rates.

Regional price difference: up to €300 on total price

10. Number of systems or linked extensions

• The price increases when combined with underfloor heating, solar water heater or zone system.
• Connecting multiple radiators can also require extra work.

Price increase upon expansion: variable, €300 – €2,000+

Summary table: price-determining factors

Advice via jeofferte.nl

Want to know which combination of factors in your situation has the most influence on the price? Via jeofferte.nl you will receive several non-binding quotes from recognized installers. This gives you insight into:

• Total costs and where you can save
• Correct CW class for your home
• Installation conditions and improvement options

A new high-efficiency combi boiler is an investment you make on average once every 12 to 15 years. Therefore, it is important to compare carefully and choose based on your personal situation, comfort requirements and future plans. The tips below will help you make an informed choice.

1. Determine your hot water needs (CW class)

The CW class determines how much hot water the boiler can deliver per minute.

• CW3: suitable for small households or apartments
• CW4: average family with shower and kitchen tap
• CW5: comfortable showering + bath or rain shower
• CW6: multiple bathrooms or simultaneous tap use

Tip: Go for at least CW4 if you live in a house with multiple people.

2. Choose the correct capacity (in kW)

The heating capacity depends on your house type, floor area and insulation level.

• Apartment or well-insulated terraced house: 18–24 kW
• Corner house or semi-detached house: 24–30 kW
• Detached house: 30+ kW

Please note: Too much capacity unnecessarily increases your consumption, too little causes comfort problems.

3. Pay attention to brand and reliability

Choose a reliable brand with good service, parts availability and warranty.

Popular brands of high-efficiency combi boilers:

• Remeha
• Intergas
• Vaillant
• Nefit Bosch
• ATAG

Tip: Read reviews and ask your installer about experiences with the brand.

4. Modulating operation = more efficient

A modulating boiler automatically adjusts the output to the heat demand. This saves gas and reduces wear.

Always combine with a modulating thermostat (OpenTherm or own brand protocol).

5. Check the installation conditions

When requesting quotes, pay attention to what is included:

• New flue gas discharge (mandatory)
• Connection to existing pipework
• Disposal of old boiler
• Adjustment and testing

Tip: Ask for a complete quote, including any additional costs.

6. Consider hybrid or hybrid-ready

Do you want to become more sustainable, but not (yet) completely off gas?

• Then choose a hybrid central heating system (HR + small heat pump)
• Or a hybrid-ready HR boiler (suitable for later expansion)

Subsidy hybrid systems 2025: €1,500 – €2,250 via ISDE

7. Pay attention to placement and accessibility

Boilers in the attic or in difficult corners can incur higher installation costs.

Tip: Discuss the accessibility of the boiler location with your installer in advance.

8. Think ahead: smart thermostat or zones

A smart thermostat increases comfort and saves energy. Some systems offer zone heating per room.

Smart thermostats: Tado, Honeywell Evohome, Nefit Easy, Vaillant vSmart
Average costs: €400 – €600 (incl. installation)

9. Maintenance = Security

Opt for a maintenance contract for annual inspection and direct assistance in case of malfunctions.

Tip: Inquire whether malfunctions and call-out charges are included.

10. Always compare multiple quotes

Don't be guided by the lowest price alone. Look at:

• Specifications and CW class
• Installation content and warranty
• Installer experience

Via jeofferte.nl you can easily compare multiple quotes from certified installers — completely without obligation.

In summary: what do you pay attention to?

Would you like to receive personalized advice based on your home type, household and wishes? Request free and non-binding quotes via jeofferte.nl.