{"product_id":"pentairtubesheetcoilkit400kpool777070234pen777070234","title":"Pentair Tubesheet\/Coil Kit 400K Pool | 77707-0234","description":"\u003cdiv\u003e\n  \u003ch2\u003ePentair MasterTemp \/ Sta-Rite Max-E-Therm 400 Tube Sheet Coil Assembly Kit (Old Tub Design) | 77707-0234\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Pentair 77707-0234 is a factory replacement \u003cstrong\u003etube sheet coil (heat exchanger) assembly kit\u003c\/strong\u003e for\n    select \u003cstrong\u003e400,000 BTU\u003c\/strong\u003e pool and spa heaters. It is used to restore heating performance when the existing\n    coil is leaking, scaled, or internally damaged. This kit is intended for \u003cstrong\u003eMasterTemp 400\u003c\/strong\u003e (models\n    \u003cstrong\u003e400NA\u003c\/strong\u003e and \u003cstrong\u003e400LP\u003c\/strong\u003e) and compatible \u003cstrong\u003eSta-Rite Max-E-Therm 400\u003c\/strong\u003e applications\n    where this part number is specified.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Pentair MasterTemp 400 heaters, models \u003cstrong\u003e400NA\u003c\/strong\u003e and \u003cstrong\u003e400LP\u003c\/strong\u003e (where 77707-0234 is specified)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAlso used on:\u003c\/strong\u003e Sta-Rite Max-E-Therm 400 heaters (where 77707-0234 is specified)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDesign note:\u003c\/strong\u003e Commonly associated with \u003cstrong\u003eheaters manufactured before January 12, 2009\u003c\/strong\u003e (old tub design). Verify your heater’s parts list to confirm.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat This Kit Does\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eReplaces the heater’s tube sheet\/coil assembly (heat exchanger section) that transfers heat to pool water\u003c\/li\u003e\n    \u003cli\u003eHelps correct internal leaks, reduced heat output, and performance loss caused by coil damage or heavy scaling\u003c\/li\u003e\n    \u003cli\u003eProvides the required sealing components for proper reassembly (kit contents vary by heater design revision)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eTube sheet coil (heat exchanger) assembly for MasterTemp\/Max-E-Therm 400 applications\u003c\/li\u003e\n    \u003cli\u003eRequired \u003cstrong\u003eO-rings\u003c\/strong\u003e for sealing the coil\/tube sheet connection points (as supplied with the kit)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInsulation components\u003c\/strong\u003e (as supplied with the kit)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIgniter\u003c\/strong\u003e (as supplied with the kit)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBlower gaskets\u003c\/strong\u003e (as supplied with the kit)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Signs You Need a New Coil Assembly\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eWater leaking from the heater cabinet or evidence of internal water damage\u003c\/li\u003e\n    \u003cli\u003ePoor heating performance after confirming proper gas supply, airflow, and clean filter flow\u003c\/li\u003e\n    \u003cli\u003eRepeated “sooting” or overheating symptoms related to restricted heat transfer (often from scaling)\u003c\/li\u003e\n    \u003cli\u003eVisible corrosion or damage to the existing coil\/tube sheet assembly during service\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eThis is a major heater repair. Installation is best handled by a qualified pool heater technician.\u003c\/li\u003e\n    \u003cli\u003eVerify your exact heater model and manufacturing\/design revision before ordering.\u003c\/li\u003e\n    \u003cli\u003eAfter replacement, confirm proper water flow, combustion airflow, and venting to prevent repeat damage.\u003c\/li\u003e\n    \u003cli\u003eAddress the root cause of coil failure (water chemistry, scale, low flow, freeze damage) before restarting the heater.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRelated Products\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=77707-0119\"\u003eCoil\/Tubesheet Sealing O-Ring Kit (400NA\/400LP) - 77707-0119\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=77707-0016\"\u003eManifold Kit (400NA\/400LP) - 77707-0016\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=77707-0010\"\u003eThermal Regulator Kit - 77707-0010\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=42001-0060S\"\u003eWater Pressure Switch - 42001-0060S\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=U178-920P\"\u003eDrain Plug - U178-920P\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=MasterTemp%20400%20parts\"\u003ePentair MasterTemp 400 replacement parts\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=Max-E-Therm%20400%20parts\"\u003eSta-Rite Max-E-Therm 400 replacement parts\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eMaintain balanced water chemistry (especially pH and alkalinity) to reduce scaling and corrosion inside the heat exchanger.\u003c\/li\u003e\n    \u003cli\u003eKeep flow in spec: clean the filter, baskets, and pump strainer to avoid low-flow overheating and coil stress.\u003c\/li\u003e\n    \u003cli\u003eIf you operate in hard-water areas, consider periodic scale prevention practices and monitor heater outlet temperature.\u003c\/li\u003e\n    \u003cli\u003eWinterize properly in freeze-prone areas—freeze damage is a common cause of coil and header failures.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n","brand":"Pentair","offers":[{"title":"Default Title","offer_id":52589953122620,"sku":"77707-0234","price":1029.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/3280\/9276\/files\/pentair-tubesheetcoil-kit-400k-pool-77707-0234-heater-parts-2674860.jpg?v=1771459093","url":"https:\/\/aquapoolsupply.com\/products\/pentairtubesheetcoilkit400kpool777070234pen777070234","provider":"Aqua Pool Supply","version":"1.0","type":"link"}