I have a pool water tankless instant heater that has two elements, each fed by a 220v 40amp double breaker.
When I measure the current to each element it is around 35amps.
When I check the heater a couple of times a day, often one of the circuit breakers has tripped. One trips more than the other, but both have tripped.
I never see it happen, of course. And when I reset the breaker it stays set. But when I go back a few hours later it'll be tripped.
Are there special breakers for this type of heater? Perhaps one with a time delay?
Suggestions welcome.
Stephen