Since combi boilers do away with the hot water tank, they are much more energy efficient, since there are no heat losses associated with stored hot water, it is simply created as needed.
On the central heating side, combi boilers pump the water round the heating system in a completely sealed system.
In a typical UK household, more than half the money spent on fuel bills goes towards providing heating and hot water.
As fuel costs rise, having an efficient and cost effective heating system is vital, and it’s one of the main steps you can take to reducing your carbon dioxide emissions.
If you have a central heating system, you may consider these energy-saving improvements: Since 2005 virtually all gas boilers that have been fitted in the UK are more efficient, condensing boilers.
Condensing boilers have bigger heat exchangers that recover more heat from the burning gas, making them more efficient.
The system uses mains water pressure, so there are no overflow tanks.
The major downside is the flow of hot water is slower than systems that provide stored hot water – most systems will struggle to cope with houses with two bathrooms.
Boilers heat water, and provide either hot water or steam for heating.To produce the hot water that comes out of the taps, the cold mains water passes over a highly efficient heat exchanger.The heat exchanger transfers the vast majority of the heat from the burnt gas (90% or more) to the cold water, and then delivers it to the taps as required.Gravity Fed Systems Historically a gravity fed central heating system was the most common system installed in UK housing.They are less common now as combi and high pressure systems are both superior when a complete new system is being installed.