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Hello Guys, thank you for all your answers and suggestions, Andy was correct  worm water rises, I have gone ahead and changed  bottom immersion heater for new one, however draining boiler was not that easy i believe drain valve does not work properly and had to drain it through immersion heater...

Hey guys, I have boiler with 2 immersion heaters, few days ago one of them broke and caused my fuses to popout and this is for e7  feed, as i did not used "Boost" immersion heater i have decided to swap feeds around, however before that i have done some tests and turn on boost to see how boiler...