Product Overview

The Jandy JXi™ Liquid Propane Low-NOx Pool and Spa Heater | JXI400P is a compact, high-performance gas heater designed to deliver fast, reliable heating for residential pools, spas, and pool/spa combination systems. With a powerful 399,000 BTU input, this heater is ideal for customers who need quick temperature recovery and dependable propane-powered heating.

The JXi series is known for its ultra-compact 2' x 2' equipment pad footprint, lightweight design, low-NOx operation, digital controls, and professional-friendly installation layout. This model uses liquid propane gas, making it a strong option for properties without natural gas service.

Built with a copper heat exchanger, electronic ignition, digital temperature control, and flexible plumbing design, the JXI400P provides strong heating performance in a smaller, easier-to-install cabinet.

⚠️ Important Purchase Notice

This product is intended to be purchased and installed by pool professionals. Product support is not provided to homeowners.

Returns are not accepted on this or any electronic equipment.

Damages to product from shipping will be covered and must be reported promptly.

To prevent possible damage during transit, we strongly recommend selecting Freight.

By purchasing this item, you agree to the terms above.

Ideal For

• Residential inground pools
• Pool and spa combination systems
• Fast spa heat-up applications
• Liquid propane pool heating systems
• Homes without natural gas service
• Replacing older propane pool heaters
• Equipment pads with limited space
• Customers wanting compact heater design
• Pool owners needing 400K BTU class heating
• Professional pool heater installations
• Low-NOx heater replacement applications

Key Features

• 399,000 BTU input — delivers powerful heating performance for pools and spas.
• Liquid propane operation — ideal for properties using LP gas service.
• Low-NOx design — engineered for cleaner combustion and reduced emissions.
• Ultra-compact footprint — approximately 2' x 2' footprint helps save equipment pad space.
• Lightweight heater cabinet — easier to handle and position during installation.
• Digital control interface — allows easy temperature adjustment and heater monitoring.
• Electronic ignition — provides reliable startup without a standing pilot.
• Copper heat exchanger — efficient heat transfer for fast water heating.
• 120/240V electrical compatibility — supports common pool heater electrical configurations.
• 2" water connections — standard pool plumbing size for professional installation.
• Automation compatible — works with compatible Jandy AquaLink automation systems when properly configured.
• Versa Plumb® ready design — supports efficient Jandy equipment pad layouts and installation flexibility.

Benefits

The Jandy JXI400P provides strong propane heating power in one of the most compact heater designs in its class. Its 400K BTU class output helps bring pool and spa water up to temperature quickly, making it a great choice for spa owners and pool/spa combination systems.

The compact cabinet helps save space on crowded equipment pads, while the lightweight design makes installation easier for pool professionals. Digital controls simplify temperature management, and the low-NOx burner design supports cleaner heater operation.

For customers who rely on propane, the JXI400P offers a dependable, high-output pool and spa heating solution with Jandy’s professional-grade build quality.

Specifications

Included Components

• 1 × Jandy JXi JXI400P liquid propane pool and spa heater
• Integrated digital control panel
• Electronic ignition system
• Copper heat exchanger assembly
• 2" water connection components, depending on supplier packaging
• Manufacturer-supplied installation documentation

Propane gas line, gas regulator, shutoff valve, electrical wiring, bonding materials, venting components, plumbing valves, unions, check valves, equipment pad materials, and installation labor are sold separately unless specifically included by the supplier.

Installation Notes

This heater must be installed by a qualified pool professional, licensed gas technician, or licensed contractor as required by local code. Proper installation requires correct propane gas supply sizing, electrical wiring, bonding, grounding, plumbing layout, water flow verification, combustion air, and venting where required.

Before installation, confirm that the fuel type is liquid propane, the gas supply can support a 399,000 BTU heater, and the electrical service is compatible with 120/240V, 60 Hz operation.

Water chemistry must be maintained within recommended ranges to protect the heat exchanger and preserve heater performance. Improper water balance, incorrect gas pressure, poor water flow, or improper installation can damage the heater and may void warranty coverage.

Customer-Facing Q&A

Q: What is the Jandy JXI400P?
A: It is a Jandy JXi liquid propane Low-NOx pool and spa heater rated at 399,000 BTU input.

Q: What is the SKU?
A: The SKU is JXI400P.

Q: What is the UPC?
A: The UPC is 052337066501.

Q: What is the distributor product number?
A: The distributor product number is LAR-15-501.

Q: What fuel type does this heater use?
A: This model uses liquid propane / LP gas.

Q: Is this a natural gas heater?
A: No. This is the propane model. Natural gas versions use different model numbers.

Q: How many BTUs is this heater?
A: It is rated at 399,000 BTU input, commonly listed as a 400K BTU class heater.

Q: Does this heater have a copper or cupronickel exchanger?
A: This model is commonly listed with a copper heat exchanger.

Q: Is this a Low-NOx heater?
A: Yes. The JXi series is designed as a Low-NOx pool and spa heater platform.

Q: What voltage does it require?
A: It supports 120/240V electrical service.

Q: What size plumbing connections does it use?
A: It uses standard 2" water connections.

Q: Is this heater compact?
A: Yes. The JXi series is designed with an ultra-compact footprint of approximately 2' x 2'.

Q: Can this connect to Jandy automation?
A: Yes. It can connect to compatible Jandy AquaLink automation systems when properly installed and configured.

Q: Can a homeowner install this heater?
A: No. This product is intended to be purchased and installed by pool professionals.

Q: Are returns accepted on this item?
A: No. Returns are not accepted on this or any electronic equipment.