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Hello I have economy 7 boiler with two immersion heaters, one of them is broken and I would like to replace it. Now What size of immersion heater do I need for 450mm diameter and made from which material, and can I install it my self. Any do's and don'ts Thanks

Hello I live on the ground floor in one bedroom shared ownership flat electricity only. Build in 1990, made from bricks with cavity wall which are not insulated. My first option was, the injections trough small holes however I spoke to my friend who do external insulation and he do...