JXI400NS | Jandy JXi 400 BTU Pool & Spa Natural ASME CUNI Heater

The Jandy JXi 400NS ASME Cupronickel Pool & Spa Heater delivers exceptional 399,000 BTU heating performance with 84% thermal efficiency, designed to meet the rigorous demands of both commercial and residential applications. Featuring a robust cupronickel heat exchanger and corrosion-resistant bronze headers, this heater ensures long-lasting durability, even in aggressive water conditions.

Its compact footprint and lightweight construction (approximately 168 lbs) make installation easy, whether for new builds or retrofits. The JXi 400NS is automation-ready, seamlessly integrating with Jandy’s AquaLink® systems for remote control via the iAquaLink® app. With its 180° rotatable top and flip-up electrical panel, it offers unmatched installation flexibility and easy maintenance access.

Energy-Efficient Heating

84% thermal efficiency rating and low-NOX design surpasses strict DOE Energy Efficiency requirements

Commercial Grade Models

Small but strong enough to handle the rigors of non-residential use, ASME compliant JXiQ heaters feature burly bronze headers and 30%1 thicker-walled, robust cupronickel heat exchanger tubes and corrosion-resistant bronze headers to meet the high stresses of commercial installations. Plumbing flexibility for quick MasterTemp® and Max-E Therm® replacement that requires no plumbing adjustments

Ultra-Compact Lightweight Design

Fits on a 2’ x 2’ pad and is 38% lighter with a 28% smaller footprint. Easy to install. Top easily removed and rotated 180 degrees for increased accessibility; includes flip up electrical panel.

Automation-Ready

Compatible with AquaLink® automation systems for anytime, anywhere control from your mobile device using the iAquaLink™ app.

The JXiQ™ ASME Compliant Gas Pool & Spa Heater for Commercial use takes the guess work out of pool heating making it easy to use, install and service.

Built with the brawn to withstand the high-use demands of commercial properties, ASME compliant JXiQ heaters are ultra-compact and constructed with bronze headers and thicker-walled cupronickel fin tubes.

• Commercial Grade Models
  Small but strong enough to handle the rigors of non-residential use, ASME compliant JXiQ heaters feature burly bronze headers and 30%1 thicker-walled, robust cupronickel or cupronickel heat exchanger tubes and corrosion-resistant bronze headers to meet the high stresses of commercial installations
  
• Energy-Efficient Heating
  84% thermal efficiency rating2 and low-NOX design surpasses strict DOE Energy Efficiency requirements
• Low Gas Pressure Sensor
  Ensures there’s enough gas pressure to safely ignite
  
• Optimize Flow
  Measures temperature rise between the inlet and outlet
  to optimize flow and avoid heat exchanger failures
  
• Auto-Sensing Power Input
  Automatically adjusts to supplied power when installed — no cards to flip and no wires to change
• Largest Display in the Industry
  Digital display is 50% larger than before and
  capable of showing 80 characters
• Best Drop-In Option
  Plumbing flexibility for quick MasterTemp® and Max-E Therm®
  replacement that requires no plumbing adjustments
• Flexible Installation. Easy Servicing.
  Top easily removed and rotated 180 degrees for increased accessibility; includes flip up electrical panel 
• Keeps Critters Out
  No more chewed up wires. The JXiQ is made with a fully encased shell to protect against rodent intrusion and damage
• Ultra-Compact Lightweight Design
  Fits on a 2’ x 2’ pad and is 38% lighter with a 28% smaller footprint

Specification

• Includes Versaflo Bypass - No
• Depth - 22.1"
• Efficiency - 0.84
• Exchanger - Cupronickel
• Fuel Type - Natural Gas
• Headers - Bronze
• Height - 26.5"
• Input Rate BTUH - 399K BTUH
• Max. GPM - 100
• Min. GPM - 30
• Pool Surface Area - up to 600 sqft
• Vent Diameter - 8"
• Weight - 168 lbs
• Width - 23.3"

Highlights

• Commercial-Grade Build: ASME-certified with bronze headers for superior corrosion resistance
  
• High Thermal Efficiency: 84% thermal efficiency for optimal performance and energy savings
  
• Compact and Retrofit-Friendly: Small footprint simplifies installation, even in tight spaces
  
• Automation Ready: Full integration with AquaLink® systems for remote control via iAquaLink®
  
• Optional VersaFlo™ Bypass: Enhances hydraulic performance and boosts energy savings

OEM Jandy JXi 400N ASME Pool & Spa Heater | 399,000 BTUs | Commercial Grade

The Jandy JXi 400N ASME Natural Gas Pool & Spa Heater is engineered for high-use commercial environments, offering robust 399,000 BTU heating performance, superior durability, and energy efficiency in an ultra-compact, easy-to-install design.

Commercial-Grade Construction

ASME-Certified Durability

Built with bronze headers and 30% thicker-walled cupronickel heat exchanger tubes to withstand high-stress commercial applications.

Corrosion-Resistant Build

Engineered for long-lasting performance, even in harsh, high-demand settings.

Energy-Efficient Heating

84% Thermal Efficiency

Exceeds strict DOE energy efficiency standards for lower operational costs.

Low-NOx Design

Environmentally friendly combustion reduces harmful emissions.

Ultra-Compact, Lightweight Design

Space-Saving Footprint

Fits on a 2’ x 2’ pad, 28% smaller footprint, and approximately 38% lighter than similar models.

Easy Handling

Top panel easily rotates 180° and includes a flip-up electrical panel for faster setup and servicing.

Seamless Automation Integration

AquaLink® Compatible

Control heating remotely via the iAquaLink® app for ultimate convenience.

Auto-Sensing Power Input

Automatically detects and adjusts to supplied voltage — no rewiring needed.

Optimized for Commercial Retrofits

MasterTemp® and Max-E-Therm® Replacement

Designed to simplify retrofitting without requiring plumbing changes.

Critter-Proof Shell

Fully enclosed shell prevents rodent damage for added reliability.

Performance Enhancements

Optional VersaFlo™ Integrated Bypass

Boosts hydraulic performance and further increases energy savings when installed.

Flow Optimization Technology

Built-in sensors measure inlet/outlet temperature to optimize flow rates and protect the heat exchanger.

Specifications

Fuel Type

Natural Gas

Input Rate

399K BTUH

Efficiency

84% Thermal Efficiency

Heat Exchanger

Cupronickel (ASME-grade thickness)

Headers

Bronze

Flow Rate

30 to 100 GPM

Dimensions

22.1" Depth × 23.3" Width × 26.5" Height

Vent Diameter

8"

Weight

168 lbs

Installation

Professional installation required; automation compatible