Understanding the Combi Boiler and How it Works

best combi boiler

A combi (or combination) furnace is an ingenious space-saving idea, and a popular choice in UK houses. In fact, combis now account for well over half of all the new domestic central heating boilers installed in Britain every year. A combi boiler is both a high-efficiency hot standard water heater and a central boiler, combined (hence the name) within one compact device. Therefore, no separate hot standard water cylindrical tube is needed, offering space save within the property. Further benefits of a combi boiler includes hot standard water being provided through your taps or shower at mains pressure. So you can enjoy powerful bathing without the need for a pump.

Controlling both your central water and hot water, a combi boiler is an all-in-one solution that serves as both a central heating boiler and hot water cylinder. An almost ‘intuitive’ fit for any family, a combi boiler reacts when a hot water tap is switched on, or when it detects the household is below than the preset temperature. Instantly responding by sending hot standard water to the essential tap, or firing up the central heating, a combi boiler means hot standard water is available 24/7 and provided at mains pressure, so no pump is needed for a ‘power shower’.

How a combi boiler warms water

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To provide hot water, combi central heating boilers are on constant standby and connected to the main water supply. When a tap is switched on, the boiler is triggered into action and it warms the standard water through a heat exchanger, for on-demand hot water any time of day.

Will a Combination Boiler save me Money?

The answer to the specific question of whether combi central heating boilers are cheaper to run than traditional central heating boilers depends entirely on your lifestyle. If you have a large family, bathing and showering all the time then a combi is probably going to turn out more expensive than a normal boiler. If you use little water however, a combi is the way to go. A condensing boiler changes this equation somewhat.

Are there any disadvantages of a combi boiler?

If you have a large, busy family with multiple bathrooms, you could lose standard water pressure, depending on the main pressure in your area. You should check the pressure levels in your area before choosing your boiler type. The nature of the combi boiler means all of the heating takes place within one main device. Because of this, the device must priorities certain actions, meaning when the hot water is switched on, the central heating will be paused. It should, however, automatically switch back when hot water is no longer needed.

If your home has a very old central heating system then you may be wise to invest in a newer model, as this could help you will save up to 35% on your average yearly heating bill. Small houses benefit from combi central heating boilers for the reasons mentioned above, so it’s no surprise that they are the best combi boiler type for gas central heating, accounting for around 70% of new boiler purchases. However, if this is your choice then you will also need to decide which combi boiler to install.