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
    • 84% 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.
    **Click here for Department of Energy ratings
    ***Versus a similar system without VersaFlo.


  • 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.