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sounds like it needs to be closed the overflow pipe.ask gary arc systems. if the tap has wires going to it then the hot tap needs a new micro switch.the cold one is turning on the pump.

http://www.arcsystems.biz

Had a similar problem with mine a few months ago.  The hot water outlet from the heater leads to a T-piece.  One leg goes to the water system and the other to the overflow.  There is a non return valve in the T-piece which had failed in my case.

United British Caravans, Newcastle supplied and fitted the part free of charge, even though the van is out of warranty.  (No connection with company other  than as a satisfied customer).

It's a simple job to do - I had the valve off a dozen tiimes before I worked out what was wrong.