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DIY Guides / Heat, Light & Electric

The Ins And Outs Of A Combi-Boiler

The Ins And Outs Of A Combi-BoilerAs the most popular type of boiler in the UK, a combi-boiler is proving to be the go-to choice for households throughout the UK due to their economical behaviour of only heating the water you use and saving space in the home. By the nature of their compact design, they can provide a household with instant hot water – whether it’s for your sink or shower – as well as immediate warmth for the central heating in the home.

Below, AEL Heating have given a brief overview of the ins and outs of a combi-boiler and the many perks of having one installed in your home:


Central Heating

The beauty of central heating is that if the temperature of a room or building dips below your pre-set thermostat level, a signal will be sent to the boiler to send hot water to all the radiators connected to the central heating system. Then once the pre-set temperature is reach, the thermostat will once again send a signal to the boiler to stop heating the room or area. This is perfect for winter and Autumn, or when house insurance dictates that the house should always be at a steady temperature.


Domestic Hot Water

Having a combi-boiler ensures that when you turn on a hot water tap or your shower, the boiler sensor will notice the flow of the water and will heat it as a result. This is achieved by a heat exchanger inside the boiler providing hot water to the specific tap you’ve operated and is the reason why you can get instantaneous hot water no matter where you are in the building.


Controlling The Combi-Boiler

Inside a combi-boiler is a variety of control valves which operate by either letting water flow through the central heating system or via diverting it inside the boiler to heat up the water required by the hot tap or shower that you want to use. It’s important to note that the Domestic Hot Water and the Central Heating won’t operate at the same time – this is so the Domestic Hot Water can take temporary priority over the Central Heating as and when it is needed.


Efficiency Of Combi-Boilers

Due to the fact that combi-boilers don’t store any hot water, heat losses are non-existent which means you can save a lot of money on your gas bill. Condensing combi-boilers go a step further and take advantage of the heat within exhaust gases rather than expelling them via a flue, so less fuel is needed to heat the water. This reduces your bills even more.


What Else Should I Know?

Combi-boilers will have a minimum water pressure which must be maintained in order to ensure a consistent flow rate of hot water – having a low water pressure will mean that the hot water coming out of your taps will be a trickle.

If this is a concern of yours, because you have two bathrooms for example, then a conventional boiler will be a much better option over a combi-boiler.


If hot water demand isn’t constant, then a combi-boiler is an effective and efficient choice for Central Heating and Domestic Hot Water. They are reliable, easy to install, compact and work on demand as and when required.

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