Combination boilers are extremely economical, making them the best selling gas boiler in the country. In fact, over 50% of boiler sales in the UK are combination boilers.
The sealed system boiler has stored hot water. Therefore, there must be adequate space for a hot water tank – an airing cupboard is often preferable.
The idea of two tanks and a storage cylinder may initially put people off the open vent boiler. But the fact it can supply a number of outlets at once is a major advantage.
Biomass is the environmentally friendly alternative to the more conventional gas and oil boilers.