Product Overview

The Raypak P-R404A-EN-N Low NOx AVIA HD Natural Gas Heater | 018045 is a smart, high-performance pool and spa heater designed for fast heating, advanced diagnostics, and modern connected control. With a powerful 399,000 BTU input, this AVIA HD heater is built for residential pool and spa systems that need dependable natural gas heating with smart control features.

This model features Raypak’s NiTek heat exchanger, polymer headers, Low NOx combustion, and built-in Wi-Fi for convenient access through the Raymote app. The AVIA platform also includes homeowner-friendly temperature control, heat-time estimates, and professional diagnostic tools for service providers.

The P-R404A-EN-N configuration is a natural gas model with 399K BTU heating performance, a 3/4" NPT gas connection, 2" buttress water connections, and a listed weight of approximately 135 lb. Public product listings identify UPC 840891099222 for this item.

Ideal For

• Residential inground pools
• Pool and spa combination systems
• Natural gas pool heating systems
• Replacing older gas pool heaters
• Customers wanting built-in Wi-Fi heater control
• Pool owners wanting app-based temperature management
• Fast spa heat-up applications
• Equipment pads needing smart diagnostics
• Low NOx heater replacement applications
• Professional pool heater installations
• Pools requiring a durable NiTek heat exchanger

Key Features

• 399,000 BTU input — delivers powerful heating performance for pools and spas.
• Natural gas operation — designed for compatible natural gas equipment pads.
• Low NOx design — engineered for cleaner combustion and reduced emissions.
• NiTek heat exchanger — designed for enhanced durability and improved corrosion resistance compared with traditional copper exchangers.
• Polymer headers — corrosion-resistant header design for pool and spa heating applications.
• Built-in Wi-Fi — enables connected heater monitoring and control through compatible Raypak / Raymote setup.
• Raymote app compatibility — provides homeowner control and professional service diagnostics.
• Digital control interface — simple temperature control and heater status display.
• Heat-time calculator — helps estimate how long it will take to reach the desired water temperature.
• Smart diagnostics — gives pool professionals access to performance and service data.
• 3/4" NPT gas connection — standard connection reference for this heater model.
• 2" buttress water connections — supports professional pool plumbing installation.
• Compact AVIA platform — service-friendly design with top-access components.

Benefits

The Raypak AVIA HD 018045 gives pool owners strong heating performance with the convenience of smart connected control. The built-in Wi-Fi and Raymote app make it easier to adjust temperature, monitor heater status, and access support features without relying only on the equipment pad interface.

The NiTek heat exchanger is a major benefit for durability. It is engineered to provide stronger resistance to erosion and corrosion than standard copper heat exchangers, helping support longer heater life when water chemistry and flow are properly maintained. Raypak’s AVIA design also emphasizes easier service access and smart diagnostic data to help technicians troubleshoot more efficiently.

For customers replacing an older natural gas heater, the 399K BTU AVIA HD offers a strong combination of heating power, Low NOx performance, connected controls, and Raypak’s proven pool heating platform.

Specifications

Included Components

• 1 × Raypak P-R404A-EN-N AVIA HD natural gas pool and spa heater
• Integrated digital control system
• Built-in Wi-Fi connectivity
• NiTek heat exchanger assembly
• Polymer header assembly
• Electronic ignition system
• Manufacturer-supplied installation documentation

Gas line materials, shutoff valve, regulator if required, electrical wiring, bonding materials, plumbing valves, unions, venting components, pressure relief valve if required by local code, equipment pad materials, network setup accessories, and installation labor are sold separately unless specifically included by the supplier.

Compatibility Notes

This heater is designed for compatible natural gas pool and spa heating systems.

Common application references include:

• Residential inground pools
• Pool/spa combination systems
• Natural gas heater replacement installations
• Low NOx heater applications
• 399K / 400K BTU class pool heater replacements
• Systems requiring 3/4" NPT gas connection and 2" water connections
• Raymote-connected pool heating control setups

Always confirm fuel type, BTU requirement, gas line sizing, electrical service, water flow, elevation requirements, venting needs, and local code requirements before ordering.

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 natural gas supply sizing, gas pressure verification, electrical wiring, bonding, grounding, water flow verification, plumbing layout, combustion air, and venting where required.

Before installation, confirm that the fuel type is natural gas and that the gas supply can support a 399,000 BTU heater. The heater must also be installed with proper water flow and balanced water chemistry to protect the NiTek heat exchanger and connected pool equipment.

Wi-Fi setup and Raymote app configuration require compatible network access at the equipment pad.

Customer-Facing Q&A

Q: What is the Raypak 018045?
A: It is a Raypak AVIA HD Low NOx natural gas pool and spa heater rated at 399,000 BTU with a NiTek heat exchanger and built-in Wi-Fi.

Q: What is the SKU?
A: The SKU is 018045.

Q: What is the UPC?
A: The UPC is 840891099222.

Q: What is the model number?
A: The model number is P-R404A-EN-N.

Q: What fuel type does this heater use?
A: This model uses natural gas.

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

Q: How many BTUs is this heater?
A: It is rated at 399,000 BTU input.

Q: What heat exchanger does it have?
A: This model uses a NiTek heat exchanger.

Q: Does it have polymer headers?
A: Yes. This model is listed with polymer headers.

Q: Does this heater have built-in Wi-Fi?
A: Yes. It includes built-in Wi-Fi for compatible Raymote app control and monitoring.

Q: Is this a Low NOx heater?
A: Yes. This AVIA HD model is a Low NOx heater.

Q: What size gas connection does it use?
A: It is commonly listed with a 3/4" NPT gas connection.

Q: What size water connections does it use?
A: It is commonly listed with 2" buttress water connections.

Q: Should this heater be professionally installed?
A: Yes. Professional installation is strongly recommended because this heater requires proper gas, electrical, plumbing, venting, bonding, water-flow, and safety setup.