{"product_id":"pentair-tube-sheet-coil-kit-pool-spa-heater-77707-0234","title":"Pentair Tube Sheet Coil Assembly Replacement Kit | MasterTemp \u0026 Max-E-Therm 400 | 77707-0234","description":"\u003cp\u003eThe Pentair Tube Sheet Coil Assembly Replacement Kit (77707-0234) is the replacement heat exchanger assembly for the Pentair MasterTemp 400 and Pentair Sta-Rite Max-E-Therm 400 pool and spa heaters.\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: HEATER COMPONENT — PROFESSIONAL SERVICE 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\n\u003cp\u003eThis kit services the heat exchanger core of the MasterTemp 400NA, 400LP, and Max-E-Therm 400 heaters. It includes the 400,000 BTU tube sheet coil assembly and the coil tubesheet sealing O-ring kit, providing all primary components needed for a complete heat exchanger service.\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\u003ePentair Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e77707-0234\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\u003eBTU Rating\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 style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eKit Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eTube sheet coil assembly; coil tubesheet sealing O-ring kit\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\u003eCompatible Fuel Types\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eNatural Gas (NA); Liquid Propane (LP)\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\u003eCompatible Equipment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003ePentair MasterTemp 400NA, 400LP; Pentair Sta-Rite Max-E-Therm 400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePoolaroo Pro Tip\u003c\/h3\u003e\n\u003cp\u003eThe tube sheet coil assembly is a primary heat transfer component — scale buildup and corrosion from improper water chemistry are the leading causes of premature failure. Before installing this replacement kit, verify that your pool water's pH (7.4–7.6), total alkalinity (80–120 ppm), and calcium hardness (200–400 ppm) are within range. Heater manufacturers recommend balancing water chemistry before returning the heater to service after any heat exchanger repair. This service must be completed by a licensed pool professional or qualified HVAC technician.\u003c\/p\u003e\n\n\u003c!-- wft:processed:manual:2026-05-01 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":52770053816595,"sku":"77707-0234","price":1342.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/pentair-tube-sheet-coil-assembly-kit-pool-spa-heater-77707-0234-3.webp?v=1767650619","url":"https:\/\/poolaroo.com\/products\/pentair-tube-sheet-coil-kit-pool-spa-heater-77707-0234","provider":"Poolaroo","version":"1.0","type":"link"}