Find your parts diagram
Sticker on the pump body (the part with the basket), not on the motor. Motor labels from Century, A.O. Smith or Regal won't match parts.
Label on the side of the tank near the base. Size is in sq ft, e.g. 420 sq ft = C4030 or CCP420.
Rating plate inside the front access panel. Note the BTU and gas type (NG or LP).
Molded into the body or printed on top. Robotic cleaners: on the power supply.
Still not sure? Call (818) 818-6559 and we'll find it for you.
HPX2181 | Hayward HeatPro Water Pressure Flow Switch
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CA P65 Warning: Cancer and reproductive harm. www.p65warnings.ca.gov
The Hayward HPX2181 Water Pressure Switch is a reliable OEM component for HeatPro® series pool heat pumps, designed to monitor proper water flow before allowing heater operation. This high-accuracy switch detects inadequate circulation or pressure drops in the system and prevents heater activation until the required flow is restored—helping to protect the heat pump from damage and ensuring safe, efficient performance. Engineered to the original manufacturer specification, it provides direct fitment and smooth operation without the need for modification.
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OEM-Specified Compatibility: Built specifically for HeatPro® series heat pumps by Hayward, ensuring direct replacement fit and preserving original equipment hydraulics.
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Flow-and-Pressure Sensing Protection: Monitors water movement and system pressure, preventing heater operation when flow is insufficient—reducing risks of overheating or freeze damage.
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Durable Construction for Pool Environments: Manufactured with materials that withstand pool chemical exposure, temperature fluctuations, and standard HVAC-pool mechanical stresses, delivering long service life.
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Quick and Straightforward Swap: Designed for ease of replacement in the heater’s plumbing circuit—minimizing downtime and installation complexity.
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Enhances System Reliability: By ensuring the flow switch is performing correctly, you maintain consistent heater cycling, guard against unnecessary shutdowns, and help preserve warranty-compliance on your HeatPro unit.
- Hayward HeatPro Heat Pumps