| http://www.w3.org/ns/prov#value | - If your boiler also makes DHW {domestic hot water for your faucets and taps} then there is a coil or tank somewhere that on one side of it is full of high pressure domestic/potable water, if this leaks it will leak into your boilers water supply and raise the pressure...Next if that all checks out is the expansion, when you heat this water it has to go somewhere, so we have expansion tanks, either
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