everything with cental heating appears to work fine, including heating of water within immersion tank using gas. I therefore presume that thermostat strapped to immersion tank is working fine. However, when i attempt to heat water using electrical switch in kitchen, water is very over heated and immersion tank begins to shake and is quickly turned off BY MYSELF !
The electric immersion heater has its own built in stat, sounds like this is faulty. Shouldn't be a costly repair. Your boiler should heat up the water a lot quicker and cheaper than the immersion heater, this is generally only used as a stand by if the boiler is faulty
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