I have a double pole switch for the hot water emerssion heater, when I switch on the water (bath or sink) the CB breaker trips.
At first this only happened when I put on bath but now it happens on both.
When I disconect the wires from the element on the tank, the CB does not trip and I have power in the wires to the element.
Do I need to change the elment or the thermostat?
Do I need to drain the tank to do so, the element is at the top of the tank.

Thank in advance
Andrew1964