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Chrishutt - the boiler, the expansion bottle and the pump are all sited high up in my garage above a mezzanine floor. The pump is level with the mid point of the boiler with about 1.5m of piping between the boiler outlet and the pump inlet. The boiler had to go this high to allow the fan flue...

Nige F, Thanks very much for your quick reply. The isolation valves on the pump were changed when the new hot water tank was installed - the engineer said that they were beginning to look their age i.e. 11 years old. Your comments have set me thinking though - if we set the pump speed to...

This is my first post so I hope I am giving enough info for someone to help. On moving into our house 11 years ago we renewed most of the central heating system- new boiler (Glow Worm Ultimate 80FF), new pipework, new radiators, new controllers. We have a sealed system operating in a Y plan...