Reg No. 534218
Comb boilers are now the most used form of central heating boilers. Most Combi's run on mains pressure water, thus do not require tanks to be placed in the loft. They also eliminate the need for a hot water cylinder as they instantly heat the water when it is needed. Another benefit with the combi is that, due to it running from the mains water supply, you can create an effective power shower without the need for a pump.
Combi boilers require the least amount of plumbing thus offer a cost saving when installing
Whilst all new central heating boilers have to meet government-set minimum standards of operating efficiency (SEDBUK Band D or above), like cars and household appliances such as washing machines, some boilers operate more economically than others...
Info - Combination boilers explained
Combination or combi boilers, combine the central heating (CH) with (tank less) domestic hot water (DHW) in one box. They are not merely infinitely continuous water heaters having the ability to heat a hydronic heating system in a large house. When DHW is run off, the combi stops pumping water to the hydronic circuit and diverts all the boiler's power to instantly heating DHW. Some Combi-Boilers have small internal water storage vessels combining the energy of the stored water and the gas or oil burner to give faster DHW at the taps or increase the DHW flow rate.
Combi boilers are rated by the DHW flow rate. The kW ratings for domestic units are 24 kW to 54 kW, giving approximate flow rates of 9 to 23 liters (2.4 to 6.1 US gal) per minute. There are larger commercial units available. High flow rate models will simultaneously supply two showers.
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