This heater rattles, I worry that it won't last. Also it trips the 50 amp GFCI breaker quite often. I don't know if draws too much power or it is a problem with the local power company.
The heater works very well and heated an Intel Pool of 18 x 9 of 52 high in 24 hours; almost 6 thousand gallons of water.
It reaches 95 degrees.
Thanks