Raypak 018045 P-R404A-EN-N AVIA HD with NiTek Natural Gas Heater 399K BTU

The Raypak 018045 P-R404A-EN-N AVIA® HD with NiTek Pool and Spa Heater is a 404A-series natural gas heater designed for efficient residential pool and spa heating. This 399K BTU class heater features Raypak’s AVIA smart control platform, built-in Wi-Fi enabled control, Raymote™ app compatibility, and a NiTek heat exchanger for enhanced durability in demanding pool environments.

This model is commonly used on residential pools and spas where a 399 MBTU/h natural gas heater with AVIA controls, NiTek exchanger technology, and 120/240VAC electrical capability is required. Always confirm gas type, model number, altitude, plumbing, venting, electrical requirements, local code, and heater sizing before ordering.

Product Features

• Genuine Raypak AVIA® HD pool and spa heater
• Manufacturer part number: 018045
• Model: P-R404A-EN-N / R404A
• 399 MBTU/h natural gas heater
• NiTek heat exchanger for enhanced erosion and corrosion resistance
• Built-in Wi-Fi enabled control system
• Compatible with Raypak Raymote™ app control where supported
• Digital control system with onboard heater management
• Indoor and outdoor installation capability where approved and properly vented
• Category I and Category III venting capability where specified
• 120/240VAC single-phase electrical compatibility
• Designed for up to 100 GPM max water flow where specified

Product Details

Compatibility

• Residential pool and spa systems requiring a Raypak P-R404A-EN-N natural gas AVIA heater
• Applications requiring a 399 MBTU/h natural gas pool and spa heater
• Systems where AVIA digital control and Raymote™ app compatibility are desired
• Installations where NiTek exchanger construction is preferred for added durability
• Indoor or outdoor installations only when installed according to Raypak instructions and local code
• Equipment pads where gas supply, water flow, venting, electrical supply, and clearances meet Raypak requirements

Common Uses

• Heating residential swimming pools
• Heating attached spas when properly sized and plumbed
• Replacing a compatible Raypak AVIA 404A natural gas heater
• Upgrading to a smart Wi-Fi enabled Raypak heater platform
• Pool systems where a NiTek heat exchanger is preferred over standard copper or cupro-nickel construction

Important Notes

• This item is the heater only.
• Gas line, electrical wiring, bonding, venting, unions, plumbing fittings, automation wiring, check valves, external bypass plumbing when required, pressure relief valve where required, indoor vent components, and installation materials are sold separately unless otherwise stated.
• This model is natural gas only. Do not use propane unless the exact propane model is ordered.
• Verify model number P-R404A-EN-N and part number 018045 before ordering.
• Verify natural gas availability, gas line sizing, elevation requirements, venting category, clearances, and local code before installation.
• This AVIA HD with NiTek model is not the same as standard Raypak Digital copper, cupro-nickel, ASME, propane, or older atmospheric heater models.
• Wi-Fi and Raymote™ features require proper setup, compatible network conditions, and supported app/device configuration.
• Some jurisdictions require specific Low NOx, emissions, venting, or efficiency requirements. Confirm local requirements before purchase or installation.
• Improper water chemistry, low flow, scale, corrosive water, freeze damage, or improper bypass settings can damage the heater and heat exchanger.
• Gas heater installation and service should be performed by a qualified pool heater professional according to Raypak instructions and local code.

Installation Notes

• Confirm the model, fuel type, BTU size, heat exchanger type, voltage, venting requirements, and local code requirements before installation.
• Install the heater on a level, non-combustible equipment pad with proper service access and clearances.
• Size the natural gas line according to the heater demand, run length, gas type, and local code.
• Confirm proper water flow through the heater before firing.
• Use proper plumbing practices and install any required check valves to protect the heater from chemical backflow.
• Install an external bypass when required by the system design or Raypak installation guidance.
• Bond and wire the heater according to the installation manual and applicable electrical code.
• Verify inlet/outlet plumbing orientation before startup.
• Set up Wi-Fi and Raymote™ control only after the heater has been safely installed and commissioned.
• Check for gas leaks, water leaks, proper ignition, proper flow, and correct temperature operation during startup.
• Register the heater and keep installation records, serial number, and startup documentation for warranty and service reference.

Related Products

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• Raypak 017960F ProTek Shield Assembly, 399K BTU
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• Raypak 006737F 1.75 PSI Pressure Switch
• Raypak 006736F 120/240V to 24V Transformer
• Raypak 009223 P-R406A-EN-C #51 Digital Natural Gas Heater
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Maintenance Tips

• Maintain proper pool water chemistry to help protect the NiTek heat exchanger.
• Keep pH, alkalinity, calcium hardness, and sanitizer within recommended ranges.
• Clean the pool filter regularly to maintain proper heater flow.
• Inspect the heater area for leaves, debris, rodents, insects, and restricted airflow.
• Check the equipment pad for water leaks, gas odor, rust, or signs of overheating.
• Keep Wi-Fi credentials and app access updated if using Raymote™ features.
• Winterize the heater properly in freeze-prone conditions.
• Have ignition, gas pressure, flame quality, venting, safety controls, water flow, and heat exchanger condition checked by a qualified heater technician during routine service.