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  1. S

    Replacing 15mm pipe with 22mm in gravity system

    I have a gravity fed hot water system (header tank in roof with hot water cylinder upstairs). The hot water system is plumbed with 22mm as far as the upstairs bathroom, but where it drops down into the kitchen downstairs it uses 15mm pipe. The hot water flow rate in the kitchen is not...
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    Boiler doesn't fire at all if hot water selected

    I have a Worcester Danesmoor (circa 1990) oil fired boiler with Honeywell Y plan control system. All been working fine for many years, but I now have a strange problem. As of this weekend we are having an issue with Heat vs Hot Water. With CH On and HW Off from the programmer then CH works...
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