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Hi, i've got an old fan heater that runs off the central heating. Due to many changes of pipework over the years its not possible to tell which is the flow and which is the return. The heater matrix lies flat but isn't symmetrical, with one connection about an inch higher than the other...

Hi, I've had this since new (10 yrs ago) and it's worked without fault. Have replaced the sacrificial anode as and when but have recently noticed that it is kettleing slightly. Also the amount of hot water produced has suddenly decreased dramatically i.e the amount of hot water from a...