Jandy JXiQ400NK JXi™ 400K BTU Natural Gas Pool & Spa Heater with VersaFlo™

SKU/Part Number: JXiQ400NK
Vendor/Brand: Jandy (Fluidra)
Condition: New

Product Overview

The Jandy® JXiQ400NK is a 400,000 BTU low‑NOx natural gas pool and spa heater engineered for superior efficiency and performance in a compact footprint. Featuring VersaFlo™ integrated bypass technology, this heater improves hydraulic efficiency and reduces pump energy usage when bypass is activated. Its lightweight, compact design makes installation and service faster and easier than traditional heaters, without compromising heating power.

Key Features

• 400,000 BTU heating capacity for rapid pool & spa heat‑up

• Natural Gas, Low‑NOx design compliant with strict air quality regulations (including California & Texas)

• VersaFlo™ Integrated Bypass Technology: boosts hydraulic efficiency and energy savings

• Ultra‑compact & lightweight: 2’ x 2’ footprint, lighter than traditional 400K BTU heaters

• Flexible installation: top or front plumbing, field‑convertible from left to right side connections

• Easy digital control interface with automation compatibility (Jandy AquaLink®)

• Corrosion‑resistant polymer headers and durable copper heat exchanger

• High thermal efficiency (meets or exceeds federal standards)

• Automation‑ready: integrates seamlessly with AquaLink RS or iAquaLink® systems

What’s Included

• Jandy JXi™ 400K BTU Natural Gas Heater (JXiQ400NK)

• VersaFlo™ integrated bypass system

• Owner’s/installation manual

Technical Specs

• BTU Input: 400,000 BTU/hr

• Fuel Type: Natural Gas

• Emissions: Low‑NOx compliant

• Thermal Efficiency: ≥ 84%

• Connections: 2” universal unions

• Dimensions (Approx.): 38” L x 24” W x 23” H

• Weight: ~126 lbs

• Ignition: Hot surface

• Heat Exchanger: Copper (cupronickel option available in other models)

• Controls: Digital LED display; AquaLink automation compatible

Ideal For

• Medium to large in‑ground pools and spas needing fast heat‑up

• Energy‑conscious owners seeking high efficiency with integrated bypass

• Installations requiring a compact footprint and lightweight design

Installation & Warranty

Professional installation is required. Incorrect installation may void manufacturer warranty. Jandy/Fluidra offers a standard limited warranty (coverage varies by region and installer certification). Always confirm warranty terms before purchase.

Compliance & Notes

• Meets/exceeds federal energy efficiency standards

• Certified Low‑NOx for areas with strict emissions rules

• For outdoor installation only (indoor with proper venting kit)

• Must follow all local gas, venting, and electrical codes

Customer‑Facing Q&A 

Q: What size pool can this heater handle?
A: The 400K BTU output is ideal for medium to large pools and attached spas, providing rapid heating capacity.

Q: Is the VersaFlo feature optional?
A: Yes, VersaFlo can be activated or deactivated depending on plumbing design and efficiency needs.

Q: Can this connect to automation?
A: Yes. The JXiQ400NK integrates with Jandy AquaLink RS and iAquaLink systems for remote control.