Product Overview

The Jandy JXiQ 400K ASME Natural Gas Pool & Spa Heater delivers commercial-grade heating performance for demanding pools, spas, hotels, resorts, HOAs, and aquatic facilities. This 399,000 BTU natural-gas model combines a heavy-duty copper heat exchanger, corrosion-resistant bronze headers, ASME-compliant construction, and advanced JXiQ diagnostics. With an 84% thermal efficiency rating, compact footprint, intelligent sensors, and Bluetooth-enabled service features, the JXIQ400NC is engineered for reliable commercial pool and spa heating.

Ideal For

Hotels, resorts, HOAs, and commercial pools

Commercial spas and aquatic facilities

High-use pool heating applications

Projects requiring ASME-compliant equipment

Key Features

399,000 BTU natural-gas heating input

ASME-compliant commercial heater construction

Heavy-duty copper heat exchanger

Corrosion-resistant bronze headers

84% thermal efficiency

Low-NOx combustion design

Intelligent inlet and outlet temperature sensors

Low gas-pressure monitoring

Bluetooth-enabled professional diagnostics

Compact equipment-pad footprint

Benefits

The JXiQ ASME platform is engineered specifically for demanding applications where durable heater construction and serviceability matter. Its bronze headers and commercial copper heat exchanger provide a robust configuration for frequent pool and spa heating cycles.

Built-in sensors continuously monitor operating conditions and help technicians diagnose flow, temperature, and combustion-related issues. The JXiQ platform can also provide estimated heat-up time information, making system operation easier to manage.

Its compact cabinet provides substantial heating capacity without requiring an oversized equipment-pad footprint.

Specifications

Warranty & Compatibility

Important Jandy Purchase Notice

Jandy commercial heaters require professional installation and proper gas, electrical, plumbing, venting, and combustion-air configuration. Warranty eligibility may depend on installation, application, and current Jandy warranty requirements. Before ordering, confirm fuel type, installation location, required venting, gas-supply capacity, water flow, and applicable local codes. Professional installation by a qualified pool and gas-equipment technician is strongly recommended.

Compatibility

The JXIQ400NC is specifically configured for natural gas. It uses 2-inch water connections and is designed for operating flows between approximately 30 and 100 GPM.

Gas supply must be properly sized for the heater's 399,000 BTU input. The heater uses a 3/4-inch NPT gas-valve connection; however, the required supply-pipe diameter depends on gas pressure, pipe length, total connected load, and applicable codes.

Do not substitute this model when propane operation is required.

Order the Correct OEM Part with Confidence

Choose the genuine Jandy JXIQ400NC when your project requires a 400K-class natural-gas heater with ASME commercial construction. Confirm your fuel type, gas capacity, water flow, venting requirements, and installation configuration before purchasing, then order with confidence knowing you selected the correct Jandy commercial heater for the application.

Customer-Facing Q&A

Q: Is this the ASME model?
A: Yes. The JXIQ400NC is the commercial ASME configuration with bronze headers.

Q: Is this heater propane compatible?
A: This specific model is factory configured for natural gas. Choose the appropriate propane model when LP fuel is required.

Q: Can it replace another 400K heater?
A: Potentially, but plumbing, gas supply, venting, electrical service, clearances, and flow requirements must be verified first.