Install or replace
Heat Pump or Gas Boiler: Which is Right for a Brussels Home?
Between the price of gas, electricity costs and the often less-than-perfect insulation of Brussels housing stock, there's no one-size-fits-all answer when comparing heat pumps and gas boilers. Here are the criteria that really tip the balance.
By DPS Chauffagiste · Published on 2 September 2026 · Updated on 19 September 2026 · 2 min read
This article was translated from French.
The air/water heat pump is riding a wave of popularity, and rightly so: it uses electricity to produce several times its equivalent in heat, and fits neatly into a broader move away from fossil fuels. But it isn't automatically the best choice, especially in the older housing typical of much of Brussels.
The criterion that trumps all others: insulation
A heat pump works all the better when the required flow temperature is low. In a poorly insulated house with high-temperature radiators, its efficiency drops sharply and the electricity bill can end up higher than gas would have cost. Conversely, with underfloor heating or large low-temperature radiators and decent insulation, it becomes highly competitive.
The middle ground: the condensing gas boiler
For a home whose insulation hasn't yet been upgraded, a modern condensing gas boiler remains a pragmatic choice: lower installation cost, compatible with existing radiators, and already offering markedly better efficiency than an old standard boiler.
- Poorly insulated building with existing high-temperature radiators: a condensing gas boiler is often more cost-effective in the short term
- Decent insulation with low-temperature emitters (underfloor heating, large radiators): a heat pump generally wins out over time
- Full renovation project (insulation plus heating): a heat pump is almost always the right choice
We carry out an on-site assessment before making any recommendation - the right choice depends on your specific home, not on a general rule.
Further reading
Cast-iron radiators in older Brussels homes: keep them with a new boiler or a heat pump?
Many older Brussels homes have kept their original cast-iron radiators, prized for their heat retention and their look. We explain when they remain perfectly compatible with a modern boiler or a heat pump, and when partial replacement is needed to preserve the system's efficiency.
27 September 2026 · 7 min read
Install or replaceAir-to-water heat pump in Brussels: where to install it without disturbing the neighbours
In the city, the location of an air-to-water heat pump needs careful thought before installation, not after the first complaint from a neighbour. We run through the distance, orientation and equipment-choice criteria that help you avoid unpleasant surprises.
23 September 2026 · 7 min read
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