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There are some heat losses but these are minimal as the insulation on the units are very good. Invariably the unit will work on an unvented water supply, that is, directly connected to the mains water supply. A pressure reducer may be required if the mains pressure is exceptionally high for safety reasons. The main safety design concern expansion of water with heat and a small water expansion tank will be required and the piping directly from the system requires to be of a certain length before stop taps are inserted to allow for adequate expansion should they ever be closed. All the typical temperature control systems are included.

One of the advantages of this system rather than gas is that there are no fume disposal problems and no annual gas testing and servicing requirements. Typical power usage is supplied by a 3 KW heater. The heating is mainly on demand which gives an efficient usage and there is little heat lost in the down times. There is a descaling anode included but it is worth descaling the anode from the heater on a regular basis to give the longest life and the most efficient heat transfer. This is a professional approach at a good cost rating.

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