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Central heating types in Belgium: guide for expats

  • Writer: Eutradesmen
    Eutradesmen
  • Jul 27
  • 6 min read

Heating control panel in Belgian home

Belgium’s most common central heating options are condensing gas boilers, air-to-water heat pumps, biomass/wood pellet boilers, electric boilers, air-to-air heat pumps, district heating, and hybrid systems. For well-insulated homes, the single most efficient combination is an air-to-water heat pump paired with hydraulic underfloor heating: the floor circuit runs at just 30–35 °C, which is precisely where a heat pump reaches its highest seasonal COP of 3–5.

 

Key facts to know before you choose:

 

  • Around 70% of Flemish homes already have enough insulation potential to support a heat pump without major envelope works.

  • Wallonia offered grants up to €3,600 for air-to-water systems in 2026; always check the current regional scheme before committing.

  • Subsidies differ significantly between Wallonia, Brussels, and Flanders, and they materially change the payback calculation.

 

Table of Contents

 

 

What are the main central heating types in Belgium?

 

Before comparing systems, one distinction changes everything: heat generators (heat pumps, boilers) produce heat, while heat emitters (radiators, underfloor heating, fan coils) distribute it. You choose them together, not as alternatives. Pairing the wrong emitter with a generator kills efficiency.

 

System

Best for

Installed cost (Belgium)

Efficiency

Grants available?

Air-to-water heat pump

Well-insulated houses, new builds, renovations

€8,000–€18,000

COP 3–5

Yes (all regions)

Air-to-air heat pump

Apartments, mild climates, no wet circuit

€3,000–€12,000

Good

Yes (varies)

Condensing gas boiler

Older/poorly insulated homes, phased renovations

€2,500–€5,000

>90%

Limited

Biomass/pellet boiler

Rural homes with storage space

€10,000–€25,000

Good, carbon-neutral

Yes (varies)

Electric boiler/storage radiators

Small flats, low-install-cost priority

€800–€2,400

Low (high running cost)

Minimal

Hybrid system

Mid-insulation homes, phased transition

€6,000–€13,000

Very good

Yes

District heating

Urban apartments with existing connection

Varies

Good

Depends on provider


Comparison infographic of heating types in Belgium

Air-to-water heat pump is now the standard choice for new builds and full renovations across Belgium. It captures heat from outside air and transfers it to your water circuit. Even on cold Belgian days, recoverable thermal energy is present in the air.

 

Condensing gas boilers are not obsolete. In a Brussels apartment with old cast-iron radiators, or a Waterloo townhouse with poor insulation, a condensing boiler is the most practical option until a deeper renovation is possible. It supplies high-temperature water without touching emitters.

 

Facq’s 2026 guidance: “An air-to-water heat pump combined with hydraulic underfloor heating is the system that offers the best overall efficiency, the greatest thermal comfort, and the lowest energy bills. The underfloor heating operates at 30–35 °C, the temperature at which the heat pump reaches its maximum COP.”

 

Biomass/pellet boilers suit rural properties near Leuven or Waterloo where storage space exists. Running costs are low, but installation is expensive and you need room for a pellet store.

 

Oil (mazout) boilers are now banned for new installations in Belgium. Existing units may continue operating, but regional restrictions are tightening.


Biomass pellet boiler in utility room

Hybrid systems combine a heat pump with a gas boiler. The boiler takes over only on the coldest days, protecting comfort without sacrificing average seasonal efficiency. Cost range: €6,000–€13,000.

 

On emitters: underfloor heating runs at 30–35 °C (optimal for heat pumps); low-temperature radiators at 45–55 °C (compatible with a well-sized pump); old cast-iron radiators at 70–75 °C (heat pump struggles here without upgrades). A dry underfloor system raises floor height by only 2–4 cm, making retrofits feasible in many Tervuren or Brussels renovations.

 

Before you finalise anything, check your energy budget options and current subsidy availability, as regional schemes change.

 

How to choose an installer and what to ask

 

Getting the right installer matters as much as choosing the right system. Here is a practical checklist.

 

Before you call anyone:

 

  1. Find your PEB/EPC certificate (mandatory on every Belgian rental or sale) and note the rating.

  2. Measure the space available for an outdoor unit, hot water cylinder (roughly 60×60 cm floor space), or pellet store.

  3. Note your current radiator type: cast iron, panel, or underfloor.

  4. Check your electrical panel. A heat pump may need a three-phase upgrade from your network operator.

  5. Gather 12 months of energy bills to give installers an accurate load picture.

 

Questions to ask every installer:

 

  1. What seasonal COP do you project for my home, and on what assumptions?

  2. Will my existing emitters work, or do they need replacing?

  3. What warranty do you offer on parts and labour?

  4. Who handles the regional subsidy paperwork?

  5. What is the installation timeline and how many days will heating be off?

  6. Do you carry out a hydraulic balance check after installation?

 

Pro Tip: Always get at least two quotes. Ask each installer for a reference from a similar property in Brussels, Waterloo, Tervuren, or Leuven. An installer who has worked locally will know the typical electrical supply situation and building types in your area.

 

A plumbing upgrade checklist is worth reviewing before any cylinder or radiator work begins.

 

Eutradesmen: your local English-speaking heating support team

 

Sorting out a heating upgrade in Belgium is straightforward when you have an English-speaking team who already knows the local building stock. Eutradesmen has 20+ years of experience working across Brussels, Waterloo, Tervuren, and Leuven, with English-speaking electricians, plumbers, and project coordinators who handle exactly this kind of work.

 

The team covers electrical checks and three-phase upgrades, radiator and cylinder plumbing, underfloor heating compatibility assessments, and grant paperwork assistance. Whether you are switching from a gas boiler in Ixelles or planning a full heat pump install in Waterloo, Eutradesmen can coordinate the site survey, trades, and staged works so nothing falls through the gaps.

 

Ready to solve your issue? WhatsApp +32 466 900 281 for a free quote today!

 

Key takeaways

 

An air-to-water heat pump paired with hydraulic underfloor heating is Belgium’s most efficient central heating combination in 2026, because the floor circuit’s 30–35 °C operating range maximises the pump’s COP of 3–5.

 

Point

Details

Best efficiency combo

Air-to-water heat pump + hydraulic underfloor heating; floor runs at 30–35 °C for maximum COP.

Flanders suitability

Around 70% of Flemish homes can adopt a heat pump without major insulation works.

Wallonia grant

Up to €3,600 available for air-to-water systems in 2026; check current scheme before committing.

Old homes

Condensing gas boilers remain the practical choice for poorly insulated properties with high-temperature radiators.

Eutradesmen

English-speaking electricians and plumbers in Brussels, Waterloo, Tervuren, and Leuven handle surveys, upgrades, and grant paperwork.

FAQ

 

What is the most efficient central heating system in Belgium?

 

An air-to-water heat pump paired with hydraulic underfloor heating delivers the highest efficiency, with a COP of 3–5 under suitable conditions. It suits well-insulated homes rated PEB C or better.

 

Can I get a grant for a heat pump in Belgium?

 

Yes. Wallonia offered grants up to €3,600 for air-to-water systems in 2026, and regional incentives also exist in Brussels and Flanders. Schemes change, so confirm the current terms before signing any contract.

 

Is a condensing gas boiler still a good option in Belgium?

 

For older, poorly insulated homes with existing high-temperature radiators, yes. A condensing boiler achieves efficiency above 90% and requires no changes to emitters or the building envelope.

 

Do I need a three-phase electricity supply for a heat pump?

 

Many Belgian homes have single-phase supplies that may need upgrading. Check your electrical panel early; your network operator handles the upgrade, but it takes planning time.

 

Can underfloor heating be retrofitted in an existing Belgian home?

 

A dry system raises the floor by just 2–4 cm, making it feasible in many renovations. A wet screed system requires 4–7 cm with an extended drying period.

 

This article provides general information only. Always confirm current subsidy rules and technical requirements with a qualified installer or your regional energy authority before making decisions.

 

Contact Eutradesmen

 

WhatsApp: +32 466 900 281 Telephone: +32 2 808 70 31 Email: info@eutradesmen.com

 

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