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Combination Gas Boiler (Combi Boiler)

Combination Boilers, more commonly known as “Combi Boilers” are the most popular type of domestic gas central heating boiler in Britain.

Combi type boilers are energy efficient because they provide instant hot water. Hot water is produced “as required” which means there is no need to heat up a  whole hot water tank or hot water cylinder.

Combi boilers are also popular because they are more compact than other boiler types. Back Boilers and System Boilers require extra water storage tanks or cylinders which use up storage space in your home or loft.

Combi Boiler Design

The diagram below provides a simplified example of how a Combination (Combi) Boiler generates hot water for your taps or central heating system.

• Cold water enters the combi boiler via the mains tap (Note there is no cold water storage tank)
• A sensor detects that heat is required and the burner inside the boiler is fired up
• The cold water is passed through a “Heat Exchanger” and reaches the required temperature
• Hot water is fed to your tap from the boiler

Summary