Astralpool IXI / Zodiac JXi Bypass Kit - R0589800

Astralpool IXI / Zodiac JXi Bypass Kit - R0589800

This is the genuine Zodiac bypass kit, part number R0589800, for Astralpool IXI and Zodiac JXi gas pool and spa heaters. The same part fits both heater sizes, the 200 and the 370. On the parts diagrams it is item 3 on the water system diagram.

• Physically Stocked, unlike most "drop-shipping" websites.
• Shipped from VIC, NSW, WA, QLD

What This Part Does

The bypass kit is item 3 on the JXi / IXI water system diagram, with the one part number, R0589800, for both heater sizes.

The heater has a flow bypass within its manifold. The Astralpool IXI manual says it lets the heater accept pump flows from a minimum of 114 L/min (30 gpm) up to 379 L/min (100 gpm), and the manual's professional service section includes header bypass reassembly recommendations.

The Rating Plate Rule (rev. IXJ-1.0)

Identify the part by the heater it came from:

1. Find the rating plate. It is inside the heater, on the outside of the combustion chamber, and shows the model number, serial number and gas type. Zodiac's JXi manual says these are needed to identify the correct part.
2. Check the badge. Astralpool IXI and Zodiac JXi heaters use the same part number for this part, so either badge is fine.
3. Check the size. R0589800 is listed for both the 200 and the 370, so the heater size doesn't change the part.
4. Match the diagram. On the water system diagram this part is item 3. The diagrams are on our IXI / JXi parts page.

Worked Example

Say the rating plate on your heater reads Astralpool IXI 370 and you need the bypass kit. The IXI and the JXi share this part, and R0589800 covers both the 200 and the 370, so R0589800 is the part to order. A Zodiac JXi 200 takes the same R0589800.

Confirmed Compatibility

• Zodiac JXi: 200 and 370
• Astralpool IXI: 200 and 370

Part Numbers and Cross-References

• Zodiac / Astralpool part number: R0589800
• Barcode: 9317545024394
• Jandy / Zodiac USA: the US Jandy JXi parts list uses the same number, R0589800
• Diagram item: 3 on the water system diagram

Other Water System Parts

• Item 1: VersaFlo Integrated Bypass (WG000016)
• Item 2: Thermal Regulator Valve (TRV)
• Item 4: Drain Plug Kit (R0446000)
• Item 5: Gasket & Seals Kit (R0589500)
• Item 6: 200 Manifold Backplate Kit (R0590002)
• Item 6: 370 Manifold Backplate Kit (R0590005)
• Item 7: 3 Port Manifold, No Backplate (R0590101)
• Item 8: Water Pressure Switch Kit
• Item 9: Goody Bag Kit (R0593500)
• Item 10: Universal Half Union Kit, needs two (R0522900)
• Item 11: Sweep Elbow AquaLink Temp Sensor (WSEAQL1001)
• Item 12: Drain Cap Assembly Kit (R0523000)

Fitting Notes From the Manual

A summary for the qualified technician doing the job. It does not replace the manufacturer's manual.

1. Turn off all power to the heater at the breaker and turn off the main gas supply. Make sure the pump is off and will stay off for the whole job.
2. Seat each union o-ring properly and tighten union nuts hand tight only. Don't overtighten, and don't use pipe joint compound or tape.
3. Only nominal 50 mm PVC or CPVC may be connected to the heater's water connections.
4. Return all valves to their operating positions, restore power, run the pump and inspect carefully for leaks, then restore the gas supply and check for proper flow.

Frequently Asked Questions

Does it fit the Astralpool IXI as well as the Zodiac JXi?
Yes. The Astralpool IXI and the Zodiac JXi use the same part number, R0589800, for the bypass kit.

Does it fit both the 200 and the 370?
Yes. R0589800 is listed for both heater sizes, the 200 and the 370.

My pump delivers more than 378 L/min. What else do I need?
The IXI manual calls for a manual bypass valve in any system where pump flow exceeds 378 L/min (100 gpm), connected between the heater's water inlet and outlet and adjusted to bring the flow into range. It suggests removing the valve handle afterwards to avoid tampering.

What is the minimum flow through the heater?
114 L/min (30 gpm). The IXI manual warns that lower flow can cause nuisance operation, with the heater turning off, or damage to the heater, and that heater failure due to insufficient water flow is not covered under warranty.

Is this a genuine part?
Yes. Heater and Spa Parts is an authorised Fluidra (Astralpool and Zodiac) dealer and warranty agent, and this is the genuine R0589800.

Manufacturer Catalogues, Diagrams & Part Numbers

Need exploded views, spare part numbers, product numbers or diagrams? See the manufacturer catalogues: Zodiac Catalogue 2026 | Astralpool Catalogue 2026. The exploded diagrams for these heaters, with every IXI / JXi part we list, are on our Astralpool IXI / Zodiac JXi Gas Heater Parts page.

Before ordering: confirm this part is correct for your equipment. Use the catalogues above, seek professional assistance, or contact us with photos of your existing part, model details, serial numbers and any labels. As with all products, this must be diagnosed and fitted by a qualified and experienced person.

Common search terms: Astralpool IXI Bypass Kit, Zodiac JXi Bypass Kit, R0589800, IXI 200 bypass kit, JXi 200 bypass kit, IXI 370 bypass kit, JXi 370 bypass kit, Jandy R0589800, IXI gas heater parts, JXi heater parts, WWDG SpaPro.