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

JXi200200K BTU22.9"6"22.1"26.5"117 lbs30100
JXi260260K BTU22.9"7"22.1"26.5"120 lbs30100
JXi400399K BTU22.9"8"22.1"26.5"126 lbs30100


  • 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.