The Jandy 399,000 BTU 84% AFUE Natural Gas Pool Heater with Copper Heat Exchanger JXiQ Series (JXIQ400NK) is a powerful and reliable pool and spa heating solution designed to deliver efficient temperature control and dependable performance for residential and commercial aquatic applications. Built as part of the Jandy JXiQ Series, this high-capacity natural gas heater combines advanced heating technology, durable components, and efficient operation for long-term pool comfort.

The Jandy JXIQ400NK delivers 399,000 BTU heating capacity with an 84% AFUE efficiency rating, providing fast and consistent heating performance for large pools and spas. Featuring a copper heat exchanger, this heater offers efficient heat transfer and reliable durability while maintaining dependable operation in demanding pool environments.

Key Features

• 399,000 BTU Heating Capacity – Provides powerful heating performance for large pools and spas
• 84% AFUE Efficiency Rating – Helps deliver efficient natural gas heating performance
• Natural Gas Operation – Provides reliable and fast pool heating using natural gas fuel
• JXiQ Series Design – Engineered for dependable and advanced pool heating applications
• Copper Heat Exchanger – Provides efficient heat transfer and reliable performance
• Fast Heat Recovery – Helps quickly raise and maintain comfortable pool temperatures
• Compact Installation Design – Allows flexible placement in pool equipment areas
• Durable Outdoor Construction – Designed for long-term operation in pool environments

Product Specifications

• Brand: Jandy
• Series: JXiQ Series
• Model: JXIQ400NK
• Product Type: Natural Gas Pool Heater
• Heating Capacity: 399,000 BTU
• Efficiency Rating: 84% AFUE
• Fuel Type: Natural Gas
• Heat Exchanger: Copper
• Application: Residential and Commercial Swimming Pools & Spas
• Installation Type: Outdoor Pool Equipment

Benefits

• Provides powerful heating for large pool and spa applications
• Extends the swimming season with reliable temperature control
• Copper heat exchanger supports efficient heat transfer
• Helps maintain consistent and comfortable water temperatures
• Designed for dependable long-term heating performance
• Suitable for demanding residential and commercial pool environments

Compatibility & Installation

The Jandy JXIQ400NK Natural Gas Pool Heater is designed for:

• Large residential swimming pools
• Commercial pool applications
• Spas and hot tubs
• Pool heating upgrades
• New pool equipment installations

Installation considerations:

• Confirm proper heater sizing based on pool volume, climate, and heating requirements
• Verify natural gas supply and connection requirements
• Ensure proper ventilation and installation clearances
• Maintain proper water chemistry for maximum heat exchanger life
• Follow manufacturer installation guidelines and local safety codes
• Professional pool equipment installation is recommended

Frequently Asked Questions

What is the heating capacity of the Jandy JXIQ400NK?
The heater provides 399,000 BTU of heating capacity for large pool and spa applications.

What fuel type does this heater use?
This model operates using natural gas.

What is the efficiency rating of this pool heater?
The Jandy JXIQ400NK features an 84% AFUE efficiency rating.

What type of heat exchanger does this heater have?
It features a copper heat exchanger designed for efficient heat transfer and reliable operation.

What series does this heater belong to?
This model is part of the Jandy JXiQ Series.