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Nicol Heating Services - Combi Boilers

Choosing the Right Boiler for Your Home
Combi Boilers
  • Ideal for homes with one bathroom
  • Hot water is generated only when it's required
  • No need for water tank
  • Compact, suited to smaller homes


Combi (short for combination) boilers contain everything needed to heat your radiators and deliver hot water to your taps in one compact unit, saving valuable space in the home as there is no need for a hot water cylinder or water tanks in the loft.

A combi boiler heats water instantly when you turn on a hot tap. The water comes straight from the mains, so the flow rate at the tap is usually very good. And because it only heats the water you need, when you need it, it is extremely energy efficient.

Combi boilers are particularly suitable for homes with one bathroom, as the flow of hot water can be reduced if more than one hot tap is running at a time. A system boiler may be more suitable for homes with multiple bathrooms, low mains water pressure or a high demand for hot water. Your Gas Safe registered heating engineer can survey your property and advise you on the most appropriate boiler to suit your needs.

Since the Building Regulations changed in April 2018, known as Boiler Plus, all boiler installations must include a timer and room thermostat. In addition, combi boiler installations must also include one of the following extra energy efficiency measures:
  • Weather compensation
  • Load compensation
  • Flue gas heat recovery
  • Smart control with automation and optimisations
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