Hayward THERMOSTAT W/O KNOB CZ & HM2 S

The Hayward Thermostat without Knob (CZ & HM2 S) is a replacement temperature‑control component used in select Hayward heater models, designed to regulate water temperature by sensing heat levels and activating or deactivating the heating element accordingly. Its compact, durable construction allows it to withstand the thermal cycling, moisture exposure, and vibration common in pool‑heater environments, while its precise sensing mechanism helps maintain stable, consistent water temperatures for efficient system performance. Although it is installed without the external adjustment knob, it integrates seamlessly with the heater’s control assembly and restores accurate temperature regulation when the original part wears out. Because it is a small, lightweight control component, the estimated weight generally falls in the range of 0.05 to 0.15 pounds.