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Thanks for the quick reply. It has given me the shove in the direction I needed! I´ve taken off the cover, and can see how the thermostat is the old type, and can easily be replaced. I´ll find a replacement and swap it over, then see how we go on from there. Thanks a lot for your help. Ray

First post, so thanks in advance to anyone who takes the time to reply. Attached photo is our Super Seven immersion heater. Everything is original from when the house was built in the 80s. We´ve never needed the boost as the water from the E7 is sufficient for daily use, but now we´ve hit a...