JXIQ400NK | Jandy JXiQ 400 BTU Natural Gas | Copper HX | VersaFlo Poly Heater

OEM Jandy JXiQ 400NK Natural Gas Pool & Spa Heater | 399,000 BTUs | VersaFlo™ Technology. The Jandy JXiQ 400NK Natural Gas Pool & Spa Heater delivers powerful, efficient heating with 399,000 BTUs and an 84% thermal efficiency rating, making it an ideal solution for both residential and commercial pools and spas. Built with a durable copper heat exchanger and corrosion-resistant polymer header, the JXiQ 400NK offers long-lasting, reliable performance.

Designed for maximum energy savings, it features VersaFlo™ Integrated Bypass Technology, which optimizes water flow for better hydraulic efficiency when heating isn't needed. SMART sensors monitor system health, while Bluetooth® connectivity and a large 80-character digital display enable real-time diagnostics via the Fluidra Pro App. Fully automation-ready, it integrates seamlessly with Jandy AquaLink® systems for remote control through iAquaLink®.

Heat when you want. Save energy
when you don’t.

Innovative VersaFlo Integrated Bypass technology automatically directs water through the heat exchanger only when heat is needed.Installation in the Versa Plumb system reduces plumbing costs and increases hydraulic efficiency.

Flexible Installation. Easy Servicing.

Top is easily removed and rotated 180 degrees for increased accessibility; includes flip up electrical.

Optimize Flow

Measures temperature rise between the inlet and outlet to optimize flow and avoid heat exchanger failures

Low Gas Pressure Sensor

Measures temperature rise between the inlet and outlet to optimize flow and avoid heat exchanger failures. Ensures there’s enough gas pressure to safely ignite

Auto-Sensing Power Input

Automatically adjusts to supplied power when installed, no cards to flip and no wires to change.

Superior Corrosion Defense

A sacrificial anode draws corrosive elements in the water away from susceptible parts and equipment *Not included on JXiQ ASME models.

Automation-Ready

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

Specification

• Includes Versaflo Bypass - Yes
• Depth - 22.1"
• Efficiency - 84%
• Energy Star - No
• Exchanger - Copper
• Fuel Tipe - Natural Gas
• 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

• VersaFlo™ Integrated Bypass: Improves hydraulic efficiency and energy savings
  
• Durable Copper Heat Exchanger: Reliable performance for standard water chemistry pools
  
• SMART Sensors: Monitor installation conditions and operational safety
  
• Bluetooth® Connectivity: Enables easy troubleshooting through the Fluidra Pro App
  
• Automation Ready: Integrates with Jandy AquaLink® and iAquaLink® for full system control

OEM Jandy JXiQ 400NK Natural Gas Pool & Spa Heater | 399,000 BTUs | VersaFlo™ Technology

The Jandy JXiQ 400NK Pool & Spa Heater combines high-powered heating performance with advanced energy-saving features like VersaFlo™ Integrated Bypass, SMART monitoring, and Bluetooth® connectivity — perfect for modern residential and commercial installations.

VersaFlo™ Integrated Bypass Technology

Enhanced Hydraulic Efficiency

Optimizes water flow by bypassing the heat exchanger when heating isn’t needed, saving energy and reducing system strain.

Lower Operating Costs

Improves overall system efficiency by reducing unnecessary pressure loss.

Smart Performance Monitoring

SMART Sensors

Constantly monitor system health, installation conditions, and operational safety.

Bluetooth® Diagnostics

Connect via Fluidra Pro App for real-time diagnostics and easier servicing.

Durable, Energy-Efficient Design

84% Thermal Efficiency

High-efficiency operation meets DOE standards for energy-conscious heating.

Long-Lasting Materials

Copper heat exchanger and corrosion-resistant polymer headers ensure durability and reliability.

Seamless Automation Integration

AquaLink® Ready

Compatible with Jandy AquaLink® systems and iAquaLink® app for remote control and scheduling.

Auto-Sensing Power Input

Adapts automatically to the incoming power supply, eliminating manual adjustments.

Flexible Installation and Easy Service

Compact and Lightweight

Fits on a standard 2’ x 2’ pad, weighing only 126 lbs, for simple placement and retrofitting.

Service-Friendly Design

Top panel removes and rotates 180° for increased access; flip-up electrical panel for fast servicing.

Safety Enhancements

Low Gas Pressure Sensor

Ensures safe ignition by detecting sufficient gas pressure before startup.

Flow Optimization

Temperature sensors adjust flow to prevent heat exchanger failures.

Specifications

Fuel Type

Natural Gas

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