{"product_id":"jandy-r0589405-heat-exchange-assembly-400k-btu-heat-exchanger-tube-fits-jxi-400-jxiq-400-heaters-genuine-oem","title":"Jandy R0589405 Heat Exchange Assembly — 400K BTU Heat Exchanger Tube, Fits JXi 400 \u0026 JXiQ 400 Heaters — Genuine OEM","description":"\u003cp\u003eThe \u003cstrong\u003eJandy R0589405 Heat Exchange Assembly\u003c\/strong\u003e is the genuine OEM heat exchanger tube for Jandy JXi and JXiQ 400,000 BTU gas pool and spa heaters. It is the core component that transfers combustion heat from the burner into the water, and it is the single most common major-repair part on this heater family.\u003c\/p\u003e\u003ch2\u003eWhen This Is the Part You Need\u003c\/h2\u003e\u003cp\u003eA failing heat exchanger typically shows up as a heater that runs but produces little or no temperature rise, a persistent high-limit or flow-related lockout with no obvious blockage, visible corrosion or scale at the tube fittings, or a water leak from inside the heater cabinet rather than the plumbing unions. Because the exchanger sits at the center of the heat path, most other JXi 400 heating complaints trace back either to this part or to the igniter and gas valve.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Jandy OEM:\u003c\/strong\u003e factory tube assembly built to the exact specification of the original equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRestores full heat transfer:\u003c\/strong\u003e returns the heater to its rated 400,000 BTU output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-resistant construction:\u003c\/strong\u003e built to withstand continuous exposure to chemically treated pool and spa water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect bolt-in replacement:\u003c\/strong\u003e matches the mounting and plumbing connections of the original exchanger.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCovers the full JXi\/JXiQ 400 lineup:\u003c\/strong\u003e one part serves the natural gas and propane variants across the model range.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible Heaters\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eJandy JXi 400: JXi400NC, JXi400NK, JXi400NN, JXi400PC, JXi400PK, JXi400PN\u003c\/li\u003e\n\u003cli\u003eJandy JXiQ 400 heaters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\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 exchange assembly \/ heat exchanger tube replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBTU Rating:\u003c\/strong\u003e 400,000 BTU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproximate Shipping Weight:\u003c\/strong\u003e 43 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Jandy \/ Zodiac (Genuine OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eDoes this include the burner, igniter or gas valve?\u003c\/h3\u003e\u003cp\u003eNo. This is the heat exchange assembly only. If your heater is failing to ignite rather than failing to transfer heat, check the igniter and gas valve first — those are separate parts.\u003c\/p\u003e\u003ch3\u003eHow do I know if the heat exchanger is the problem?\u003c\/h3\u003e\u003cp\u003eThe classic sign is a heater that fires normally, runs through a full cycle, and still produces little or no water temperature rise, often alongside a high-limit trip or a leak from inside the cabinet. A qualified technician can confirm with a visual inspection for corrosion, scaling, or a cracked tube.\u003c\/p\u003e\u003ch3\u003eWill this fit my JXi 400?\u003c\/h3\u003e\u003cp\u003eIt fits the JXi400 and JXiQ400 model range listed above. Match the model and serial number on your heater's rating plate against your equipment manual before ordering, or send it to us and we will confirm the fit.\u003c\/p\u003e\u003ch3\u003eWho should install it?\u003c\/h3\u003e\u003cp\u003eA qualified pool professional or licensed gas technician. The heater must be isolated at the breaker and the gas and water supply shut off before the cabinet is opened, and the plumbing unions must be reconnected and pressure-tested correctly to avoid leaks.\u003c\/p\u003e\u003cdiv class=\"ps4u-faq\"\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the part number for this assembly?\u003c\/h3\u003e\n\u003cp\u003eJandy lists this heat exchange assembly under part number R0589405. Quote R0589405 when you cross-reference it against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.\u003c\/p\u003e\n\u003ch3\u003eHow do I confirm this fits my equipment?\u003c\/h3\u003e\n\u003cp\u003eMatch the part number on the component you are replacing, or look it up in the parts list for your Jandy heater. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.\u003c\/p\u003e\n\u003ch3\u003eDoes gas heater work need a professional?\u003c\/h3\u003e\n\u003cp\u003eYes. Gas heating equipment sits under specific code requirements covering gas supply, venting, bonding and grounding. Shut off the gas and cut power at the breaker before opening the heater, and have a licensed professional carry out the work.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty on this part?\u003c\/h3\u003e\n\u003cp\u003eIt carries the standard Jandy manufacturer warranty. The terms are set by Jandy, and on gas heating equipment the coverage generally applies only when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.\u003c\/p\u003e\n\u003c\/div\u003e\u003cp\u003e\u003csmall\u003eCalifornia Proposition 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.\u003c\/small\u003e\u003c\/p\u003e","brand":"Jandy","offers":[{"title":"Default Title","offer_id":67577403310444,"sku":"R0589405","price":1349.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1000\/0872\/2796\/files\/1803137.jpg?v=1790620651","url":"https:\/\/poolsupplyharbor.com\/products\/jandy-r0589405-heat-exchange-assembly-400k-btu-heat-exchanger-tube-fits-jxi-400-jxiq-400-heaters-genuine-oem","provider":"Pool Supply Harbor","version":"1.0","type":"link"}