Heat Only Boilers are the most simplistic form of an Electric Boiler, but their compact format means they can be placed almost anywhere you have the space. Whilst the Heat Only Boiler's larger cousins feature built in pumps and vessels the Heat Only only has the essentials, this means any additional items such as the pump can be placed external to the boiler. This boiler is normally the go to boiler for space issues or where pump & expansion arrangements are not required. This box contains the Heat Only Boiler, Wall fixings & mounting guide and Installation manual.