{"product_id":"pentairwaterpoolandspainc_77707-0244","title":"Pentair Cupro Nickel Tube Sheet Coil Assembly Kit for MasterTemp HD Series | 77707-0244","description":"\u003ch3\u003eOEM Replacement Heat Exchanger Coil for MasterTemp HD Series Heaters\u003c\/h3\u003e\n\u003cp\u003eThe Pentair 77707-0244 is the OEM Cupro Nickel Tube Sheet Coil Assembly Kit for the MasterTemp HD Series heater water system, confirmed for use on the 400HDNA and 400HD-LP models (\u003cstrong\u003emanufactured before 1\/13\/09\u003c\/strong\u003e).\u003c\/p\u003e\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003e⚠️ IMPORTANT: KIT LISTING\u003c\/strong\u003e\u003cbr\u003eThis listing is a kit assembly — not a single component. Confirm all included pieces are accounted for upon receipt before beginning service.\u003c\/p\u003e\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003e⚠️ IMPORTANT: VERSION-SPECIFIC PART — VERIFY BEFORE ORDERING\u003c\/strong\u003e\u003cbr\u003eThis assembly is for MasterTemp HD Series heaters manufactured \u003cstrong\u003ebefore 1\/13\/09\u003c\/strong\u003e. Heaters built on or after that date require a different assembly. Check the manufacture date on your heater's data label before ordering.\u003c\/p\u003e\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003e⚠️ IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED\u003c\/strong\u003e\u003cbr\u003eGas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification.\u003c\/p\u003e\n\u003cp\u003eThe tube sheet coil assembly is the primary heat transfer component within the MasterTemp HD Series heater's water system. The cupro nickel alloy construction provides enhanced resistance to corrosion in aggressive water conditions — including salt water and water with elevated mineral content — compared to standard copper coil assemblies. Replacing a degraded or failed coil assembly restores proper heat transfer between the burner system and pool water circulation.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003ePentair Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e77707-0244\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eCupro Nickel\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\u003eCapacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e400,000 BTU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eQuantity Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eKit\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\u003eVersion \/ Date Qualifier\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eFor heaters manufactured before 1\/13\/09\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, locate the manufacture date on your heater's data label — typically found on the inside of the front door panel or on the heater cabinet. This assembly is specific to units built \u003cstrong\u003ebefore 1\/13\/09\u003c\/strong\u003e. If your heater was manufactured on or after that date, consult your equipment manual or contact us to identify the correct replacement assembly for your unit.\u003c\/p\u003e\n\u003c!-- wft:processed:manual:2026-04-06 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":53980251619603,"sku":"77707-0244","price":1965.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/pentair-cupro-nickel-tube-sheet-coil-assembly-kit-for-mastertemp-hd-series-77707-0244-9.webp?v=1790877493","url":"https:\/\/poolaroo.com\/products\/pentairwaterpoolandspainc_77707-0244","provider":"Poolaroo","version":"1.0","type":"link"}