{"product_id":"hayward_hpx2181","title":"Hayward Water Pressure Flow Switch | HPX2181","description":"\u003cp\u003eThe Hayward Water Pressure Flow Switch (HPX2181) is the OEM replacement flow-sensing pressure switch for Hayward pool and spa heating equipment.\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003eIMPORTANT: PROFESSIONAL INSTALLATION REQUIRED\u003c\/strong\u003e\u003cbr\u003eElectrical control components must be installed or replaced by a qualified electrician or certified pool technician. Do not attempt to service this component without appropriate certification.\u003c\/p\u003e\n\n\u003cp\u003eThis pressure switch monitors water flow through the heating system and signals the control circuit to confirm adequate flow before allowing heating operation. Replacing a faulty flow switch restores proper safety interlock function and prevents the heater from operating under low- or no-flow conditions.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eHayward Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eHPX2181\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e610377807098\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eChannel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eOpen Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePoolaroo Pro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, verify this part number against your equipment's wiring diagram or service label. Flow switch specifications — including pressure differential rating and electrical rating — vary across Hayward heater and heat pump models. Consult your equipment's installation manual or Hayward's parts documentation to confirm HPX2181 is the correct switch for your specific unit.\u003c\/p\u003e\n\n\u003c!-- wft:processed:manual:2026-06-18 --\u003e","brand":"Hayward","offers":[{"title":"Default Title","offer_id":54303486869779,"sku":"HPX2181","price":81.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/hayward-water-pressure-flow-switch-hpx2181.webp?v=1784875960","url":"https:\/\/poolaroo.com\/products\/hayward_hpx2181","provider":"Poolaroo","version":"1.0","type":"link"}