Replaces the obsolete 39525 and obsolete 39204 Newly designed and includes o-ring This high-limit thermistor sensor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 ...read more

Replaces the obsolete 39530 and obsolete 39205 Newly designed and includes o-ring This control thermistor is a safety device that measures the water temperature of your spa and communicates that temperature reading to the Motherboard It simply screws ...read more

The after-market thermistor kit (1 control and 1 hi-limit sensor included with o-rings as well as adapters) that fit with either the 4kW or 6kW after-market PDR Titanium double-barrel heater These sensors can plug in directly to the motherboard located ...read more