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Product Overview

The Raypak 017708 B-R407A-EN-C Digital Low NOx ASME Natural Gas Heater is a high-capacity pool and spa heater designed for powerful heating performance, digital operation, and commercial-grade ASME construction. With a 399,000 BTU natural gas heating capacity, this model is well suited for larger commercial pools, spas, facility pools, and residential applications where ASME-rated equipment is required.

This heater features a copper heat exchanger for efficient heat transfer and bronze headers for added durability in demanding pool and spa environments. As a Low NOx model, it is designed for applications where reduced emissions compliance is required.

With natural gas operation, electronic ignition, digital controls, ASME construction, and Raypak’s service-friendly design, the 017708 is built to deliver dependable heating performance in commercial, public, and code-sensitive installations.

Ideal For

The Raypak 017708 heater is ideal for:

• Commercial swimming pools
• Commercial spas and therapy pools
• Large residential pools requiring ASME equipment
• Apartment, HOA, hotel, and facility pools
• Natural gas installations
• Low NOx emission-regulated areas
• Applications requiring bronze headers
• Pool and spa systems requiring high BTU heating performance
• Replacing older Raypak B-R407A ASME natural gas heaters

Key Features

399K BTU Heating Performance

The Raypak B-R407A-EN-C provides 399,000 BTU of natural gas heating power, making it a strong choice for larger pool and spa systems that require fast heat-up and reliable temperature maintenance.

Low NOx Emissions Design

This heater is designed as a Low NOx model, making it suitable for areas or applications where reduced emissions equipment is required by local code.

ASME-Rated Construction

Built to ASME standards, this heater is designed for commercial, public, and code-sensitive installations where ASME-rated equipment may be required.

Natural Gas Operation

Designed for use with natural gas, making it a practical option for properties with existing natural gas service.

Copper Heat Exchanger

The copper heat exchanger provides efficient heat transfer and dependable performance when pool or spa water chemistry is properly maintained.

Bronze Headers

Heavy-duty bronze headers provide added strength and durability, making this heater suitable for demanding commercial and residential pool environments.

Digital Control System

The digital control panel allows users to set and monitor pool or spa water temperature easily. Built-in diagnostics also help simplify troubleshooting and service.

Electronic Ignition

Electronic ignition provides reliable startup when there is a call for heat and eliminates the need for a constant standing pilot.

Service-Friendly Raypak Design

Raypak heaters are designed with accessible components and a practical service layout, helping pool professionals perform maintenance and troubleshooting more efficiently.

Benefits

The Raypak 017708 B-R407A-EN-C gives pool owners, facility managers, and service professionals a strong combination of high-output heating, ASME construction, Low NOx compliance, and easy digital operation. Its 399K BTU rating makes it a dependable option for larger commercial pools, spas, and residential systems that require powerful natural gas heating.

The copper heat exchanger supports efficient heat transfer, while the bronze headers add durability for heavier-use applications. Digital controls make everyday operation simple, and built-in diagnostics help service professionals identify issues more efficiently.

Specifications

Important Installation Notes

This heater should be installed by a licensed pool, gas, or HVAC professional. Proper gas line sizing, electrical wiring, water flow, bonding, ventilation, clearances, and local code compliance are required for safe operation and warranty protection.

Because this is an ASME model, it may be required for certain commercial, public, or code-sensitive pool and spa applications depending on local code. Always confirm project requirements before ordering.

This model is designed for natural gas. It should not be used with propane unless the correct factory-approved propane model is selected.

For installations in emissions-regulated areas, confirm that this Low NOx model meets local requirements before purchase and installation.

Customer-Facing Q&A

Q: Is this heater natural gas or propane?
A: This model, Raypak 017708 / B-R407A-EN-C, is the natural gas version.

Q: How many BTUs is this heater?
A: This model is rated at 399,000 BTU, also commonly referred to as 399K BTU.

Q: What does Low NOx mean?
A: Low NOx means the heater is designed to produce reduced nitrogen oxide emissions compared with standard gas heater models. This may be required in certain regulated areas.

Q: What does ASME mean?
A: ASME means the heater is built to a recognized pressure vessel construction standard. ASME heaters are commonly used for commercial, public, or code-sensitive pool and spa installations.

Q: What is the benefit of bronze headers?
A: Bronze headers provide added strength and durability compared with standard residential header materials, making them suitable for demanding installations.

Q: Does this heater have a copper heat exchanger?
A: Yes. This model uses a copper heat exchanger for efficient heat transfer.

Q: Does it have digital controls?
A: Yes. The heater includes a digital control system for temperature adjustment, monitoring, and service diagnostics.

Q: Is this heater suitable for commercial pools?
A: Yes. This ASME model is designed for commercial and code-sensitive pool and spa applications, but local code requirements should always be confirmed before installation.

Q: Does this heater require professional installation?
A: Yes. Gas pool heaters must be installed by a qualified professional to ensure proper gas, electrical, venting, water flow, and bonding compliance.