Therm 4.0kW Heater [240V] [Caldera Highland Series Heater] (C2400-C3330-1A) pooltool A properly selected replacement helps

A properly selected replacement helps preserve the intended support and internal path of the valve instead of forcing the repair to rely on a near-fit substitute

That makes the union-style design a practical advantage in addition to its flow-control role

Matching the correct DSI igniter helps preserve intended startup function and supports a cleaner repair

Useful when original bearings are worn or rough

Epoxy putty helps fill

Therm 4.0kW Heater [240V] [Caldera Highland Series Heater] (C2400-C3330-1A) pooltool A properly selected replacement helpsThe Therm 4. 0 kW heater is designed for compatible 240 volt Caldera Highland Series applications where the heater assembly needs to be replaced with the correct series specific part. Application specific heaters are useful because they help preserve the fit, wiring expectations, and general operating characteristics the spa was built around. This replacement is especially useful when the original heater has failed, stopped heating consistently, or is