Jandy 400,000 BTU JXi™ Pool and Spa Heater

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The JXi™ heater sets the standard in pool and spa heating with unsurpassed energy-efficiency and optional cost-saving Integrated Bypass technology that diverts water flow away from the heater when there is no call for heat. Boasting an 84% thermal efficiency rating and a low-NOx design. The JXi also features an ultra-compact, lightweight design, that allows for faster and easier installation.

Jandy Item Code: JXI400N, JXI400NK, JXI400P, and JXI400PK


  • Energy-Efficient Heating - 84% thermal efficiency rating and low-NOx design surpasses strict DOE Energy Efficiency requirements.
  • Automation-Ready - Compatible with AquaLink® automation systems for anytime, anywhere control from your mobile device using the iAquaLink™ app.
  • 5-Year Heat Exchanger Warranty - JXi heaters with VersaFlo factory installed receive an industry leading 5-Year standard warranty on the heat exchanger.
  • Heat When You Want. Save When You Don’t. - The heater is typically only used 3.5% of average annual pump runtime, the other 96.5% of the time the heat exchanger can be bypassed.
  • Save Even More with VersaFlo Integrated Bypass - Variable-speed pumps can be run at a lower speed when bypassing the heater, saving up to $350 per year in electricity costs.***
  • Ultra-Compact Lightweight Design - Easy to store, transport, and install, JXi easily fits on a 2’ x 2’ pad and is 38% lighter with a 28% smaller footprint.
  • Best Retrofit Option - Plumbing flexibility for quick Mastertemp® and Max-E Therm® replacement that requires no plumbing adjustments.
  • Flexible Installation - Top can be easily removed for increased accessibility and rotated 180 degrees so you never need to rotate headers. Also includes a flip up electrical panel for convenient setup and service.
  • Versa Plumb® Ready - Installation in the Versa Plumb system*(standard on all models) reduces plumbing costs and increases hydraulic efficiency, all using the smallest footprint available.††

Venting Application

  • Jandy JXi Pro Series The "Original" Side Wall Vent Kit
    • Jandy Item Code: JXIVK
  • Jandy JXi Pro Series Hi-Rise Side Wall Vent Kit
    • Jandy Item Code: JXIHRK
  • Please visit our Heater Venting collection to add to cart.
  • To learn about the difference, please review owners manual for details.

*Not available with VersaFlo Integrated Bypass technology
**VersaFlo Integrated bypass is available factory-installed on select models or can easily be added to any JXi on site. See JXIVFKIT installation manual for more details.
***Versus similar system without VersaFlo. VersaFlo not available on ASME certified models.
Compared to major competitor models.
††Sweep elbow included in all JXi models

Jandy JXi Brochure

Jandy JXi VersaFlo Brochure

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Manuals & Attachments