Heat pump vs gas boiler: the 15-year comparison
By KlimaGrid Energy Desk · March 18, 2026 · 7 min read
Heat pump or gas boiler for your Luxembourg home in 2026? The technical and economic comparison now clearly favours the heat pump, but context (insulation, current heating, budget) still matters.
Total cost of ownership over 15 years
A condensing gas boiler costs €5,000–€8,000 to install. An air-water heat pump costs €12,000–€22,000 gross, €4,000–€14,000 after Klimabonus (up to €8,000). Over 15 years, gas fuel for a 150 m² home runs ~€22,000 (€1,500/year at current prices). The heat pump uses ~3,500 kWh/year of electricity = ~€1,050/year, or ~€16,000 over 15 years. Gas-boiler total: €28,000. Heat-pump total: €22,000. Difference: +€6,000 for gas.
CO₂ impact, no contest
A gas boiler emits about 4.5 tonnes CO₂/year for 150 m². A heat pump, powered by the Luxembourg electricity mix (largely imported nuclear + hydro), emits about 1.2 tonnes. Paired with solar PV, the footprint drops under 0.3 tonnes. Over 15 years, a heat pump avoids 50 to 65 tonnes of CO₂ — equivalent to 3 years of emissions from a combustion car.
Thermal comfort and control
A gas boiler heats up fast but offers little control finesse. A heat pump runs continuously at low power, ideal with underfloor heating or low-temperature radiators. Some reversible models also work as summer air-conditioning — a real plus given more frequent heatwaves.
The regulatory lock-in to anticipate
The EU is gradually phasing out residential fossil heating. From 2027, new gas-boiler installations may be restricted in several member states. Investing in a gas boiler today means risking forced replacement before end-of-life. The heat pump is the investment aligned with the regulatory trajectory.