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I'm just about to replace my hot water cylinder (open vented pumped indirect). It's about 20 years old and predictably the flow for the indirect coil is considerably lower down the old tank compared to any new tank I have looked at. So I'll have to modify some of the pipe work. At the...

I have an old Ideal Classic NF50 boiler on an open vent system with a hot water tank. The radiators are always very hot but the hot water seems a bit variable. A lot of the time, no matter how long I run the boiler to heat the water, the water in the tank only gets warm....perhaps 50C. Then...