Coates Heater Electric Pool/Spa Heater Replacement Parts 23000102 Flow Switch, 1" dia. (ST s/n TJ01999 & below) CPH PHS CE ST

The Coates Heater Replacement Part 23000102 (Flow Switch, 1" diameter, for ST models s/n TJ01999 & below, compatible with CPH, PHS, CE, and ST series) is a vital safety and control component for Coates electric pool and spa heaters.

This flow switch is designed to monitor water movement within the system, ensuring the heater only operates when proper circulation is present. By preventing dry firing and protecting heating elements from damage, it plays a crucial role in maintaining safe and efficient performance. Its 1-inch diameter design makes it suitable for specific plumbing configurations, and as a direct replacement part, it integrates seamlessly into designated Coates heater models, supporting reliable operation, equipment longevity, and consistent heating efficiency in both residential and commercial aquatic environments.