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Thanks for for your quick reply. Yes I quite agree, I have looked at the installation instructions myself and came to the same conclusion. Although I haven't opened the case and studied the wiring setup. I think that the installer chose to use the power supply to control the boiler as it reduced...

I recently had a new WB 30CDi System boiler installed as part of a solar HW installation, along with an unvented thermal store. Everything was installed by suitably qualified personnel. But I am not 100% sure about the installation. The boiler is controlled by the main power feed, i.e. when...