Spa Components 4.0 kW [15" x 2"] FloThru Heater [PS/SI Brett/Caldera] (B24040S) adhesives The Magna Flow design helps

The Magna Flow design helps preserve the intended seat character of the original setup

This version is especially practical when the system already uses a 2 inch threaded layout and you want to avoid introducing a different plumbing style during replacement

Thermostats are useful because they help keep heating performance within the intended range for dependable system behavior

5 HP impeller replacement is needed

This version is especially useful when the application calls for an 11

Spa Components 4.0 kW [15" x 2"] FloThru Heater [PS/SI Brett/Caldera] (B24040S) adhesives The Magna Flow design helpsThe Spa Components 4. 0 kW flo thru heater is designed for compatible 2 inch by 15 inch applications associated with Brett and Caldera style systems. Flo thru heaters are useful because they provide direct in line heating while preserving the intended plumbing layout of the spa system. This replacement is especially useful when the original heater has failed electrically, is no longer heating consistently, or has reached the point where a full heater