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I suspect, from experience of neighbours houses, I have both a mixer valve and a scale problem. Some have changed the valve and it cured the problem. The 'boiler' circuit seemd OK to me as the radators get fully hot and the pumps sound and feel OK. I do have a complete set of manuals as left by...

Many thanks for your advice. I have got the valve and will change it soon. John Webb

Yes, both pumps are working. I, however, thought the domestic water was solely mains water pressure. I thought one pump heated the water in the tank, the other pump circulated that same water through the heating system and the hot water system was fed by mains pressure cold water flowing through...

The central heating side is working fine thanks. It responds rapidly from the heat store as radiators get hot before the boiler has kicked in to keep the tank hot.

I have two problems with this 'device'. It has a separate header tank in the loft and the boiler is beside and slightly above. I have got the boiler thermostat on high and the tank half way such that the boiler is controlled by the Boilermate OK. First problem is the header tank pipe is very hot...