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How do combi boilers work?

Combi or combination boilers are the most popular type of boiler for UK households, with more being installed in British homes each year.

Get your quote online

Simply answer a few multiple choice questions about your existing boiler and we’ll give you a fixed price for a new boiler including all parts and installation[28]

Most modern combi boilers are condensing, making them effective and energy efficient. Condensing boilers make more use of the energy supplied by extracting heat from flue gasses that would have otherwise been lost by a non-condensing boiler.

Combi boilers work by having one compact system heating both your hot water and radiators so there is no need to have an additional external cold water tank or hot water cylinder. Combi boilers provide instant hot water, by constantly being on standby when there is no water demand. As soon as you turn the hot water tap, the boiler will kick in and the water will become hot very quickly. When the request for hot water is trigged by someone turning on the hot tap, this signals the boiler to start heating water inside of the system. The heat exchanger transfers the majority of the heat from the burnt gas inside the boiler to the cold water, and then delivers it to the taps as required.

Inside combi boilers the control valves operate in different directions, to either allow water to flow through the central heating system or divert it to the appropriate hot water tap as required, but never both at the same time. You can pre-set your desired temperature and the boiler will work with the room thermostat to ensure your home is heated as you like and directed into the central heating system.

Want to talk your boiler options through?

A boiler is a big decision. If you want to talk through something in person, simply fill in the form below to give us an idea of where you are and one of our local advisors will give you a call back quick-sharp.

0203 763 2682

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[28] Exclusions apply. See www.help-link.co.uk/fixed-price-quote-faqs/

[79] Online discount is available to domestic gas and LPG customers who receive an online quote for all boiler brands excluding Vokera. Discount will be applied as long as the quoted price is still applicable at the point of sale. Online discounted price is only available for the duration of the 14-day quote validity which starts from the day the quote was given. Offer is not available to Help-Link UK Ltd employees.

Online discount can be applied as follows:
All boiler manufacturer types excluding Vokera are eligible for a 5% discount off the final quoted price. Conventional to combi boiler swaps also qualify for an additional £50 discount after 5% initial discount is applied.

This offer cannot be used in conjunction with any other offers.
Offer available from April 2017. Any boiler quotations before this date will not be eligible for the discount post purchase. Help-Link UK Ltd have the right to withdraw or change the offer at any time.
Online discount is automatically applied when the customer gets a quote using the online quote system at www.help-link.co.uk and as long as the customer meets all the above criteria.