{"product_id":"raypak-sensor-well-105a-405-206-408-003765f","title":"Raypak Sensor Well 105A–405\/206–408 Heater Models | 003765F","description":"\u003ch2 class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eRestore proper temperature-sensor positioning and protect the sensing element inside a compatible Raypak pool or spa heater with the Raypak 003765F Sensor Well Kit. This genuine Raypak replacement part is also commonly referred to as a thermowell.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe sensor well installs in the heater’s water header and creates a sealed pocket for the temperature sensor. Pool water transfers heat through the metal wall of the well, allowing the sensor to monitor water temperature without being directly exposed to circulating water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA damaged, corroded, leaking, or heavily scaled sensor well can interfere with temperature readings and may allow water to leak around the sensor opening. Replacing the well helps restore proper sensor placement and a secure seal at the heater header.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe kit includes a stainless-steel thermowell, brass threaded fitting, and sealing O-ring. The temperature sensor itself is not included. Raypak recommends genuine factory-authorized replacement parts because they are designed to meet the manufacturer’s original performance requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eGenuine Raypak factory-authorized replacement part\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStainless-steel thermowell construction\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBrass threaded mounting fitting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIncludes sealing O-ring\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProtects the temperature sensor from direct water exposure\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSupports accurate water-temperature monitoring\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps repair leakage around the sensor opening\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDirect replacement for compatible Raypak heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for installation in the water header\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTemperature sensor is sold separately\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eManufacturer\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRaypak\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eManufacturer Part Number\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e003765F\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSKU\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e003765F\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eUPC \/ Barcode\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e840891001225\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eProduct Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHeater Temperature Sensor Well\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eAlternate Description\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eThermowell Assembly\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThermowell Material\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eStainless Steel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThreaded Fitting Material\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBrass\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThread Size\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e½-Inch Male Pipe Thread\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThermowell Length\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApproximately 3⅜ Inches\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eThermowell Outside Diameter\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApproximately ½ Inch\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHex Width\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApproximately ⅞ Inch\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eO-Ring Included\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eYes\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTemperature Sensor Included\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNo\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePublished replacement-part measurements identify an approximately 3⅜-inch stainless-steel tube, ½-inch male pipe thread, brass fitting, and included O-ring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe 003765F sensor well is used with numerous compatible Raypak heater families, including select:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e105A and 105B heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e185 through 405 heater models\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e185A through 405A models\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e185B through 405B models\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDigital 206A, 266A, 336A and 406A heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLow NOx 207A, 267A, 337A and 407A heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAdditional 206 through 408 configurations using the same sensor-well assembly\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCompatibility depends on the complete model number, production date, water-header design, and parts revision. Verify the heater identification label and applicable Raypak parts diagram before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Information\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTurn off electrical power, close the gas supply, stop the circulation pump, and relieve all system pressure before servicing the heater. Allow the heater to cool and drain the water header as necessary.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eRemove the temperature sensor carefully before loosening the existing well. Inspect the header threads and sealing surface for corrosion, cracks, debris, or scale. Install the supplied O-ring in the correct position and thread the new assembly into the header without overtightening it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eReinstall the sensor fully inside the well and secure it according to the heater service instructions. Restart circulation and inspect the connection for leaks before operating the burner.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProfessional installation by a qualified pool-heater technician is recommended.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003ePackage Contents\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eOne stainless-steel sensor well\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOne brass threaded fitting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOne sealing O-ring\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe temperature sensor, wiring, header, control board, installation tools, and labor are not included.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWarranty Information\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWarranty coverage is subject to Raypak’s current replacement-part terms, proof of purchase, correct application, and proper installation. Damage caused by freezing, corrosion, overtightening, damaged header threads, improper installation, or incompatible equipment may not be covered.\u003c\/span\u003e\u003c\/p\u003e\n\u003csection id=\"psd-manuals-sell-sheets\"\u003e\u003ch2\u003eManuals \u0026amp; Sell Sheets\u003c\/h2\u003e\n\u003cp\u003eManufacturer equipment references for an OEM part listed in the factory parts chart. Confirm your equipment model and production revision before use.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/s3.amazonaws.com\/AWSProd\/sites\/raypakcom\/documents\/6000.75.pdf\" target=\"_blank\" rel=\"noopener\"\u003eSell sheet: Digital Low NOx ASME 207A–407A — Digital heater brochure\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/s3.amazonaws.com\/AWSProd\/sites\/raypakcom\/documents\/241236.pdf\" target=\"_blank\" rel=\"noopener\"\u003eManual: Digital Atmospheric 206A–406A — Installation and operation manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/s3.amazonaws.com\/AWSProd\/sites\/raypakcom\/documents\/241793.pdf\" target=\"_blank\" rel=\"noopener\"\u003eManual: Digital Low NOx ASME 207A–407A — Installation and operation manual\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e","brand":"Raypak","offers":[{"title":"Default Title","offer_id":52762988249398,"sku":"RAY003765F -H","price":79.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/1167\/9798\/files\/raypak-sensor-well-003765f-pool-supply-depot-2648895.webp?v=1792464512","url":"https:\/\/poolsupplydepot.net\/products\/raypak-sensor-well-105a-405-206-408-003765f","provider":"Pool Supply Depot","version":"1.0","type":"link"}