The best type of central heating system and boiler for your home should be energy efficient, so you use less energy making your bills lower, whilst providing the best hot water and heating performance.
A combi boiler is the most common type as it is small and compact, so can be easily housed in a kitchen or garage, and it provides instant hot water as well as controlling your heating. Add to this the fact that no additional water tanks are required and it’s no surprise that combi boilers are the most popular choice for smaller homes with one bathroom.
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In contrast to the combi boiler, the standard boiler is ideal for larger houses with several bathrooms requiring hot water. It is also useful if water pressure in your house is low, but it does need two separate tanks, one for hot and one for cold water.
The system boiler is very like the standard system but does not require the cold water tank in the loft. It is similarly an ideal option for larger homes with multiple bathrooms and is economical to run.
A house with a back boiler is likely to be an older system where the boiler is located behind a fireplace and can work off gas, electric or solid fuel. A conversion to a combi boiler would reduce your energy costs.