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Combination boilers
Combi boilers have become the best selling boiler type for gas central heating in the UK. They are small; fitting into cupboards, and very economical to run. And because they heat water directly from the mains, you don’t have to wait for water to heat up - and your stream of hot water will be endless.
They are more economical than other types too. Because combi boilers don’t use an external hot water tank, there is no cylinder to heat first, and no need to reheat the same water again if you’ve let it run cold.
However, for this same reason - the lack of a hot water storage tank - your nice hot shower will be interrupted if anyone else starts running the hot water in your home at the same time.
Is this the right boiler for me?
If you live in a small house or flat, without multiple bathrooms, or are short for space then a combination boiler will be an excellent choice for you.
If you currently have a cold-water tank in the loft but want to covert your loft space into an additional room, swapping your old boiler for a combination boiler will eliminate the need for the tank, and free up more space.
A combination boiler is the only way to have instant, on-demand hot water in your home without the inconvenience of having to wait for the water tank to be heated and you’ll also get drinkable water from every tap.
Sealed system boilers
A system boiler (also known as a closed or sealed system boiler) works on the principle of stored hot water. This means that you will need an airing cupboard or other space for the hot water storage tank.
Although a tank is needed in the airing cupboard, a system boiler still needs less space than a traditional open vent or heating only boiler, which utilises a second tank in the loft. Also, many of the individual components of the heating and hot water system are built in, which means that installation is quicker, neater, easier and more efficient.
With a system boiler you can run hot water from a range of outlets simultaneously, without someone else’s shower running cold on them. You will also get good water pressure.
Is this the right boiler for me?
A system boiler is a great choice for a larger home or family with hot water needs that can’t be met by a combi boiler, but you will need a tank in the airing cupboard though.
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