Combi or Closed Vented

Combi Boilers

A combination or ‘combi’ Boiler Repairs Lytham is both a high efficiency water heater and a central heating boiler in a single compact unit. Combi boilers heat water directly from the mains when you turn on a tap, so you won’t need a hot water storage cylinder or a cold water storage tank in the roof space.

They are also very cost-effective and energy-efficient as water is heated instantly rather than being heated and stored in a cylinder. An added benefit is that hot water is delivered at mains pressure, which means that you could get a powerful shower without the need for a separate pump.

The only significant downside to a combination boiler is that when more than one hot water source is run at the same time then the flow rate can be affected since the boiler can only heat so much water at a time.

These factors mean that combination boilers are ideal for homes where space is at a premium and where only one bathroom is likely to be in use at any one time.

Closed vented (mains pressure) system boilers

Closed vented system boilers require a pressurised cylinder for storing hot water, however the major heating and hot water system components are built into the boiler itself. In addition, there is no need for a tank in the loft, so it can be an option in a home with little or no loft space or where the space is earmarked for a conversion.

As the water is coming into the hot water cylinder at mains pressure you also don’t have the issue of poor pressure in the loft shower for example.

Additionally, the fact that there is a ready supply of hot water at all times makes this system ideal for homes where multiple sources of hot water are required simultaneously – family homes with more than one bathroom, for instance.

Finally if you are planning on fitting water underfloor heating to your house it would be wise at this point to consider replacing an open vented system boiler with a mains pressure system boiler as the former probably won’t have been specified to take the extra load of an underfloor heating system on top of the hot water and central heating demands.

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