Jandy | R0589405 | Heat Exchange Assembly, 400K BTU Heat Exchanger Tube, Fits JXi 400 and JXiQ 400 Heaters
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The Jandy R0589405 Heat Exchange Assembly is the genuine OEM heat exchanger tube for Jandy JXi and JXiQ 400,000 BTU gas pool and spa heaters. It is the core that moves combustion heat from the burner into the water, and it is the most common major repair part on this heater family.
When You Need This Part
A failing heat exchanger usually shows as a heater that runs but gives little or no temperature rise, a repeat high limit or flow lockout with no blockage, corrosion or scale at the tube fittings, or a water leak from inside the cabinet rather than at the unions. Most other JXi 400 heating complaints trace to this part, the igniter or the gas valve.
Key Features
- Genuine Jandy OEM: factory tube assembly built to the original equipment spec.
- Restores full heat transfer: brings the heater back to its rated 400,000 BTU output.
- Corrosion resistant: built for continuous exposure to treated pool and spa water.
- Direct bolt-in replacement: matches the mounting and plumbing connections of the original exchanger.
- Covers the full JXi and JXiQ 400 lineup: natural gas and propane variants.
Compatible Heaters
- Jandy JXi 400: JXi400NC, JXi400NK, JXi400NN, JXi400PC, JXi400PK, JXi400PN
- Jandy JXiQ 400
Specifications
- Part Number: R0589405
- UPC: 052337067157
- Type: Heat exchange assembly, heat exchanger tube replacement
- BTU Rating: 400,000 BTU
- Shipping Weight: 43 lb
- Brand: Jandy / Zodiac
Frequently Asked Questions
Does this include the burner, igniter or gas valve?
No. This is the heat exchange assembly only. If the heater fails to ignite rather than fails to heat, check the igniter and gas valve first.
How do I know the heat exchanger is the problem?
The heater fires normally, completes a cycle and still gives little or no temperature rise, often with a high limit trip or a leak inside the cabinet. A technician can confirm with a visual check for corrosion, scale or a cracked tube.
Will this fit my JXi 400?
It fits the JXi400 and JXiQ400 models listed above. Match the model and serial on the rating plate, or send it to us and we will confirm the fit.
Who should install it?
A qualified pool professional or licensed gas technician. Isolate the heater at the breaker, shut off gas and water, and pressure test the unions after reassembly. Gas heating equipment falls under code requirements for gas supply, venting, bonding and grounding.
What is the warranty?
Standard Jandy manufacturer warranty. On gas heating equipment coverage generally applies only when a licensed professional performs the installation. Keep your receipt and packaging until you have confirmed correct operation.
California 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.