Boiler Types Explained
From combi boilers to heat pumps — every type explained by our Gas Safe engineers so you can make the right choice for your home.
Combi Boiler
The UK's most popular boiler — instant hot water with no storage tank required.
System Boiler
Mains-pressure hot water with the capacity for larger households.
Heat-Only Boiler
The traditional choice — also known as a conventional or regular boiler.
Oil Boiler
Reliable heating for rural properties off the gas grid.
LPG Boiler
Gas heating without the gas main — using Liquefied Petroleum Gas.
Electric Boiler
A clean, silent heating solution — no flue, no gas required.
Biomass Boiler
Low-carbon heating fuelled by wood pellets, chips, or logs.
Air Source Heat Pump
Renewable heating that extracts warmth from outdoor air.
Ground Source Heat Pump
Ultra-efficient renewable heating using the earth's stored warmth.
Back Boiler
A legacy heating system hidden behind a fireplace — usually ready for replacement.
Floor-Standing Boiler
Heavy-duty heating for larger homes — mounted on the floor rather than the wall.
Condensing Boiler
The modern standard — all new UK boilers must be condensing by law.
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