JXi™ Pool & Spa Heater

The Total Package Pool & Spa Heater

VersaFlo™ Integrated Bypass technology for JXi available installed from the factory (select models) or as an easy retrofit to any JXi pool and spa heater on site.

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The Total Package Pool & Spa Heater

The JXi sets a new standard in pool and spa heating technology with its ultra-compact size, lightweight design, and installation flexibility, making it a top choice for pool professionals and pool owners everywhere. The high-efficiency, low-NOx JXi pool and spa heater is available in three BTU sizes, 200K, 260K, 399K, and offered in both natural and propane gas models.

Pro-driven features for the fastest, most customer-friendly pool heater installation include:

  • Ultra-compact, 2'x2' footprint for small space requirements and maximum installation flexibility*
  • Lightweight design, weighs less than 126 pounds unpackaged, for easy maneuverability and transport
  • Best retrofit option, no plumbing adjustments required for quick and easy replacement of Mastertemp® and Max-E-Therm® heaters
  • 83% thermal efficiency rating and low-NOx design surpasses strict DOE energy-efficiency requirements

VersaFlo Integrated Bypass technology for JXi available installed from the factory (select models) or as an easy retrofit to any JXi on site.

  • Offers up to 20 percent additional energy savings**
  • Automatic actuation of flow bypass valve is based on call for heat and does not require human interaction
  • The flow bypass valve is integrated into the JXi's header, requiring no external plumbing modifications
  • The hydraulic savings of VersaFlo make it the perfect complement to Versa Plumb®, which reduces plumbing costs and maximizes energy efficiency in the smallest footprint available
*Refer to JXi manual for proper heater clearances that may apply.
**Versus a similar system without VersaFlo Integrated Bypass.

Available for sale only at your local pool store. This product can not be purchased online.


  • Energy-efficient - 83% thermal efficiency rating and low-NOx design
  • Ultra-Compact Lightweight Design - Easy to store, transport, and install, the JXi pool and spa heater is 38% lighter with a 28% smaller footprint.*
    *Smaller footprint compared to major competitor models
  • Flexible Installation - 180° rotatable top so you never need to rotate headers.
  • Versa Plumb-Ready - Installation in the Versa Plumb system reduces plumbing costs and increases energy efficiency, all using the smallest footprint available. Sweep elbow included in all JXi models
  • Easy Access - Electrical panel flips up for ease of service.
  • Easy Replacement - 3-port header for easy plumbing and drop-in replacement of MasterTemp, Max-E-Therm, and Jandy Pro Series pool heaters.
  • Sidewall Ventilation - Provides versatility and ease of installation.
  • High-Efficiency Gas Train and Heat Exchanger Design
    • Copper fin heat exchanger tubes for efficient heat transfer
    • Single stainless steel burner with robust design
    • Blower-driven gas and air mix for reliable performance
    • Hot surface ignitor for consistent start-ups
  • User-Friendly Control - Digital interface for effortless temperature control and diagnostics with run-time and cycle meter.

Technical Details

  • Corrosion-resistant stainless steel header bar for extreme heat exchanger durability.
  • Venturi-driven air and gas mix for enhanced performance.
  • Reliable, balanced flow and temperature control with thermal regulator valve.
  • Differentiated limit switches meet applicable product safety standards.
  • Corrosion-resistant temperature sensors for reliable operation.


Model Number Firing Rate Heater Width Vent Diameter Depth Height Weight Min. GPM Max. GPM
JXi200 200K BTU 22.9" 6" (15cm) 22.1" 26.5" 117 lbs* 30 100
JXi260 260K BTU 22.9" 7" (18cm) 22.1" 26.5" 120 lbs 30 100
JXi400 399K BTU 22.9" 8" (20cm) 22.1" 26.5" 126 lbs 30 100

*Actual weight may vary.


Models Description
JXI200N Jandy Pro Series JXI Pool Heater 200 Natural
JXI200P Jandy Pro Series JXI Pool Heater 200 Propane
JXI260N Jandy Pro Series JXI Pool Heater 260 Natural
JXI260P Jandy Pro Series JXI Pool Heater 260 Propane
JXI400N Jandy Por Series JXI Pool Heater 400 Natural
JXI400P Jandy Pro Series JXI Pool Heater 400 Propane
JXI400NK Jandy Pro Series, JXi Pool Heater, 400K BTU Natural, With VersaFlo Bypass
JXiVFKIT VersaFlo Bypass Accessory Kit for JXi Heaters

Parts Breakout Diagram

JXi Heater Parts

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Frequently Asked Questions

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Heater pounding or knocking

1. Look for obstruction or closed valve in system.
2. Check for damaged internal bypass.
3. Variable-speed pump set too low.
4. Dirty filter or baskets.

Igniter lights but does not fire

1. Flip the switch to “on” position.
2. Cycle ignition sequence until air is out of the gas line.
3. Replace gas valve.
4. Check controls for proper operation.
5. Check supply pressure.

Low temperature rise

1. Heater is condensing. Flue product moisture will condense at the start-up until the heater water temperature reaches the normal operating conditions.
2. Faulty or broken Thermal Flow Regulator.
3. Correct the plumbing.
4. TRV failure.

Not enough heat - heater is slow to heat up, heater not maintaining set temperature

1. Gas meter too small.
2. Gas line from meter to heater too small.
3. Correct gas supply pressure to 4.0" W.C.
4. Replace with heater of higher input.
5. Check blower inlet grill for obstruction.

Pump not operating

1. Check circuit breakers and power source.
2. Replace the pump.
3. Recheck wiring.
4. Check time clock setting.

Unstable combustion - heater turns off and on, heater ignites slowly, flame lifts and goes out, short yellow streaked flame

1. Make sure the gas supply matches the gas type
indicated on the rating plate.
2. Correct gas supply pressure to 4.0" W.C.
3. Increase offset gas pressure. Rotate adjustment screw clockwise.
4. Correct gas supply pressure to 4.0" W.C
5. Decrease offset gas pressure. Rotate adjustment screw counter-clockwise.
6. Check offset pressure is set to —0.2” W.C. If this is set properly, connect manometer to blower throat and gas valve port to obtain differential. Make sure the differential value falls within the specified range for the heater size (see Table TBD in the owner's manual).


JXiTM Heater Brochure

Item #: SL6355
File Size: 4287203
Language: EN-CA

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Installation and Operation Manual: JXi Heater

Item #: H0574300
File Size: 20351373
Language: EN-CA

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Brochure Chauffe-eau JXi�

Item #: SL4355
File Size: 3357736
Language: EN-CA

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Item #: H0579800
File Size: 15005901
Language: EN-CA

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