Need help choosing this Raypak heater? Call 725-205-1783 or email sales@poolsupplydepot.net with your existing heater model, fuel type, installation ZIP code and equipment-pad photos. We can help confirm the replacement and shipping or freight options. Local pickup is available in Henderson, Nevada; confirm availability before visiting.

Product Overview

The Raypak Digital® P-R406A-EN-C #51 Natural Gas Heater is designed to deliver powerful residential pool and spa heating in higher-elevation installations. With 399,000 BTU heating performance, electronic ignition, polymer headers, and a copper heat exchanger, this heater provides high-capacity natural gas heating for larger residential pool and spa applications.

This #51 model is configured for 2,000–6,000 ft elevation applications, making it a suitable choice for customers who need a Raypak digital heater designed for higher-altitude operation. Its digital control panel allows easy temperature adjustment and system monitoring, while durable construction helps support long-term outdoor performance.

Ideal For

This heater is ideal for residential pool owners who need a high-output natural gas pool heater designed for higher-elevation installations.

Recommended for:

• In-ground pools and attached spas
• Larger residential pools
• Pool and spa combinations
• Higher-elevation installations from 2,000–6,000 ft
• Outdoor equipment pad installations
• Natural gas pool heating systems
• Customers replacing an older Raypak 406A high-altitude heater
• Customers who want digital controls with electronic ignition

Key Features

Digital Control Panel
The easy-to-use digital interface allows simple temperature adjustment and helps monitor heater operation and service diagnostics.

399,000 BTU Heating Performance
Provides powerful heating capacity for larger residential pools and spas, helping reduce heat-up time compared to lower BTU models.

High-Altitude #51 Configuration
Designed for 2,000–6,000 ft elevation applications.

Natural Gas Operation
Designed for use with natural gas fuel systems.

Electronic Ignition
Starts efficiently without the need for a standing pilot.

Copper Heat Exchanger
Delivers effective heat transfer for standard residential pool applications.

Polymer Headers
Help resist corrosion and support long-term durability.

Corrosion-Resistant Cabinet
Built to withstand outdoor pool equipment environments.

High-Wind Resistance
Designed to perform reliably in outdoor equipment pad environments.

Unitherm Governor
Helps prevent condensation and supports efficient heater operation.

ProTek Shield Technology
Helps protect the heat exchanger and internal components from corrosion.

Remote Compatible
Can be connected to compatible 2-wire or 3-wire pool control systems for added convenience.

Benefits

The Raypak Digital® P-R406A-EN-C #51 gives pool owners dependable natural gas heating in a high-altitude configuration. Its 399,000 BTU output makes it a strong choice for larger residential pools, attached spas, and customers who want faster heat-up performance.

The digital control system makes everyday operation simple, while built-in diagnostics help make service and troubleshooting easier. Durable features such as the copper heat exchanger, polymer headers, corrosion-resistant cabinet, high-wind-resistant design, and ProTek Shield technology help support long-term performance in outdoor pool environments.

For customers replacing an existing Raypak 406A high-altitude heater, this model may also provide a familiar installation footprint and operating experience.

Specifications

Customer-Facing Q&A

Is this heater natural gas or propane?
This listing is for the natural gas Raypak P-R406A-EN-C #51 model.

What does #51 mean on this Raypak heater?
The #51 version is configured for higher-elevation applications, typically from 2,000–6,000 ft.

Is this a digital heater?
Yes. This model includes Raypak’s digital control system for easy temperature adjustment and operational diagnostics.

Does this model have electronic ignition?
Yes. This heater uses electronic ignition.

Is the heat exchanger copper or cupro-nickel?
This model uses a copper heat exchanger. It is not the cupro-nickel version.

Can this heater be used with saltwater pools?
This model may be used with properly balanced pool water. For saltwater pools or more demanding water conditions, many customers often prefer a cupro-nickel heat exchanger model for added corrosion resistance.

Does this heater require professional installation?
Yes. Gas pool heaters should be installed by a licensed plumber, qualified pool professional, or gas appliance technician according to local code requirements.

Can this heater be installed at sea level?
This #51 model is intended for higher-elevation applications from 2,000–6,000 ft. For lower elevations, customers should select the standard elevation model instead.

Can this heater be installed indoors?
This model is commonly used for outdoor installation. Indoor installation requires proper venting and must follow the manufacturer’s instructions and local code requirements.

Is this heater Low NOx compliant for California SCAQMD areas?
This standard model may not meet all Low NOx requirements in certain California jurisdictions. Customers in areas with strict emissions rules should confirm local code requirements before purchasing.