Therm 4.0 kW [15" x 2"] FloThru Heater [Dual Sensor Systems] (C2400-0807-TPS) airbuttons Relays are useful because they

Relays are useful because they support dependable multi-circuit switching where the original control design requires a dedicated relay component

A properly selected Intermatic timer contributes to more dependable weekly control and helps tailor operation to more specific usage patterns

When the visible upper section of a valve begins to fail

and keep the replacement focused on the component that actually failed

Retrofit design

Therm 4.0 kW [15" x 2"] FloThru Heater [Dual Sensor Systems] (C2400-0807-TPS) airbuttons Relays are useful because theyThe Therm 4. 0 kW flo thru heater is designed for compatible 2 inch by 15 inch 240 volt applications that use a dual sensor system. Heaters with application specific sensor support are useful because they help preserve the control logic and monitoring setup that the spa was originally built around. This replacement is especially useful when the original heater has failed, is heating inconsistently, or needs replacement while maintaining compatibility