JXI400P | Jandy JXi 400 BTU Propane Pool & Spa Heater

OEM Jandy JXi 400P Propane Pool & Spa Heater | 399,000 BTUs | Low-NOx | Automation Ready. The Jandy JXi 400P Propane Pool & Spa Heater delivers 399,000 BTUs of powerful and energy-efficient heating in an ultra-compact design. With an 84% thermal efficiency rating and low-NOx emissions, it meets strict DOE energy standards while offering eco-friendly performance for both residential and commercial pools and spas.

Weighing approximately 126 pounds and measuring just 22.1" D x 21.6" W x 26.5" H, the JXi 400P is perfect for fast installations and retrofits—often replacing heaters like MasterTemp® or Max-E-Therm® without plumbing modifications. It's fully automation-ready, compatible with Jandy’s AquaLink® systems and the iAquaLink® app for convenient remote control. Models with optional VersaFlo™ Integrated Bypass technology offer even greater energy efficiency.

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.

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 reduces plumbing costs and increases energy efficiency, all while using the smallest footprint available.

Specification

• Includes Versaflo Bypass - No
• Depth - 22.1"
• Efficiency - 84%
• Energy Star - No
• Exchanger - Copper
• Fuel Tipe - Propane
• Headers - Hi-Temp Poly
• Height - 26.5"
• Input Rate Bruh - 399K BTUH
• Max. GPM - 100
• Min. GPM - 30
• Pool Surface Area - up to 600sft
• Professional Installation Required - Yes
• Smart Product - Automation Compatible
  
• Vent Diameter - 8"
• Weight - 126 lbs
• Width - 22.9"

Highlights

• High-Efficiency Heating: 399,000 BTUs with an 84% thermal efficiency rating
  
• Ultra-Compact Footprint: Installs easily in tight equipment pads and retrofit applications
  
• Low-NOx Technology: Reduces emissions while meeting DOE standards
  
• Automation Ready: Integrates with Jandy AquaLink® and iAquaLink® for remote operation
  
• Optional VersaFlo™ Bypass: Improves hydraulic efficiency and reduces energy consumption

Additional Info

OEM Jandy JXi 400P Propane Pool & Spa Heater | 399,000 BTUs | Low-NOx | Automation Ready

The Jandy JXi 400P delivers powerful, eco-friendly propane heating with a compact, easy-to-install design, ideal for residential and commercial pools and spas.

High-Efficiency, Eco-Conscious Heating

84% Thermal Efficiency

Optimized for maximum heat output while minimizing energy usage.

Low-NOx Emissions

Meets strict DOE energy standards with reduced environmental impact.

Compact, Installation-Friendly Design

Ultra-Compact Footprint

Occupies less space with a 2’ x 2’ pad footprint — 38% lighter and 28% smaller than traditional heaters.

Lightweight and Portable

At only 126 lbs, the JXi 400P is easy to move, store, and install, even in tight spaces.

Seamless Automation Integration

AquaLink® and iAquaLink® Compatible

Manage your pool heater remotely with full system control via your mobile device.

Auto-Sensing Power Input

Simplifies installation by automatically adapting to the supplied electrical input.

Service and Retrofit-Friendly Features

Easy Maintenance Access

Top panel easily removes and rotates 180° for full service access; flip-up electrical panel simplifies setup.

Quick Retrofit Installations

Designed for fast replacement of MasterTemp® and Max-E-Therm® heaters without plumbing changes.

Flexible Installation

Versa Plumb® System Ready

Installs seamlessly into Jandy’s Versa Plumb® system to lower plumbing costs and increase energy efficiency.

Optional Hydraulic Optimization

VersaFlo™ Integrated Bypass (optional)

Enhances water flow efficiency when heating isn’t needed, saving even more energy and reducing pump strain.

Specifications

Fuel Type

Propane

Input Rate

399K BTUH

Efficiency

84% Thermal Efficiency

Heat Exchanger

Copper

Headers

Hi-Temp Polymer

Flow Rate

30 to 100 GPM

Dimensions

22.1" Depth × 22.9" Width × 26.5" Height

Vent Diameter

8"

Weight

126 lbs

Installation

Professional installation required; automation compatible