Therm [Cal Spas] 16.25" 4.0kW Flo-Thru Incoloy Heater (26-0165-5S-K) poolcovers A circuit board is useful

A circuit board is useful because it manages core system functions

J&J cord connection

3 inch hole size

or electronic interface components have become damaged

Therm [Cal Spas] 16.25" 4.0kW Flo-Thru Incoloy Heater (26-0165-5S-K) poolcovers A circuit board is usefulTherm [Cal Spas] 16. 25" 4. 0kW Flo Thru Incoloy Heater (26 0165 5S K) provides a targeted heating solution for Cal Spas, combining the specified output and construction needed to restore consistent water heating without relying on a generic substitute. Its 4. 0kW heating output and 16. 25" heater length should be matched to the original equipment requirements before installation, since spa heaters are not universally interchangeable. A heater