{"product_id":"jandy-r0589405-heat-exchanger-tube-assembly-jxi-400k-btu-pool-spa-heaters-genuine-oem","title":"Jandy R0589405 Heat Exchanger Tube Assembly — JXi 400K BTU Pool \u0026 Spa Heaters — Genuine OEM","description":"\u003cp\u003eThe \u003cstrong\u003eJandy R0589405 Heat Exchanger Tube Assembly\u003c\/strong\u003e is the genuine Zodiac\/Jandy OEM copper heat exchanger for \u003cstrong\u003eJXi 400K BTU\u003c\/strong\u003e pool and spa heaters. It replaces a leaking, corroded or scaled exchanger and restores proper heat transfer and efficiency.\u003c\/p\u003e\n\n\u003ch2\u003e⚠️ Check Your Heater Size\u003c\/h2\u003e\n\u003cp\u003eThis exchanger fits \u003cstrong\u003e400K BTU\u003c\/strong\u003e JXi heaters only. The 260K model uses \u003cstrong\u003eR0589403\u003c\/strong\u003e and the 200K model uses \u003cstrong\u003eR0589402\u003c\/strong\u003e. Check the rating plate on your heater before ordering — replacement parts are final sale.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Zodiac\/Jandy OEM:\u003c\/strong\u003e Correct tube geometry and header fit for the JXi 400 combustion chamber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper construction:\u003c\/strong\u003e Efficient heat transfer for standard pool water chemistry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNatural gas and propane:\u003c\/strong\u003e Fits all four JXi 400 variants — JXI400N, JXI400NK, JXI400P and JXI400PK.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRestores efficiency:\u003c\/strong\u003e A corroded exchanger wastes fuel and can leak pool water into the combustion chamber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent-level repair:\u003c\/strong\u003e Far less costly than replacing the complete heater.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e R0589405\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Heat exchanger tube assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 400,000 BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Jandy JXi 400 heaters — JXI400N, JXI400NK, JXI400P, JXI400PK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel:\u003c\/strong\u003e Natural gas and propane\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCupro-Nickel Version:\u003c\/strong\u003e R0746905\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther Sizes:\u003c\/strong\u003e R0589403 (260K), R0589402 (200K)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Jandy \/ Zodiac (Genuine OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWill this fit my JXi 200 or JXi 260?\u003c\/h3\u003e\n\u003cp\u003eNo. Each heater size has its own exchanger — \u003cstrong\u003eR0589402\u003c\/strong\u003e for the 200K and \u003cstrong\u003eR0589403\u003c\/strong\u003e for the 260K. Only the 400K models take this part.\u003c\/p\u003e\n\n\u003ch3\u003eShould I use copper or cupro-nickel?\u003c\/h3\u003e\n\u003cp\u003eCopper is correct for pools with well-managed water chemistry. If you run a salt system, or your pH and chlorine levels swing outside ideal ranges, the cupro-nickel version \u003cstrong\u003eR0746905\u003c\/strong\u003e lasts considerably longer in those conditions.\u003c\/p\u003e\n\n\u003ch3\u003eDoes it fit both natural gas and propane heaters?\u003c\/h3\u003e\n\u003cp\u003eYes. The exchanger is common to all four JXi 400 variants, including the VersaFlo bypass models.\u003c\/p\u003e\n\n\u003ch3\u003eWhat symptoms indicate a failed heat exchanger?\u003c\/h3\u003e\n\u003cp\u003eWater leaking inside the heater cabinet, rising copper levels in your pool water, visible corrosion or scale on the tubes, or a heater that fires but will not hold temperature.\u003c\/p\u003e\n\n\u003ch3\u003eCan I return it if it turns out to be the wrong part?\u003c\/h3\u003e\n\u003cp\u003eReplacement parts of this type are generally final sale and cannot be returned once fitted. Confirm your heater model and serial number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eWho should install it?\u003c\/h3\u003e\n\u003cp\u003eA qualified pool heater technician. The work involves gas and combustion components and requires the heater to be fully isolated, drained and depressurised.\u003c\/p\u003e","brand":"Jandy","offers":[{"title":"Default Title","offer_id":52974988624189,"sku":"R0589405","price":1099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/6741\/8429\/files\/r0589405.jpg?v=1788566446","url":"https:\/\/poolsupply4u.com\/products\/jandy-r0589405-heat-exchanger-tube-assembly-jxi-400k-btu-pool-spa-heaters-genuine-oem","provider":"PoolSupply 4U","version":"1.0","type":"link"}