The electric system boiler is wall mounted and has to be connected to a cylinder which will provide the hot water and the heating off the house can be taken of it as well be it under floor heating or radiators. The boiler has to be connected to the mains cold water. The boiler can be fitted in a kitchen cupboard thanks to their compact size and the cylinder sited somewhere else in the house. They work off the off peak economy 10 tariff. The boilers available are the ACV Etech W or Fusion.