Authorized Ruud Distributor

When you purchase from AquaDoc, you're guaranteed to receive an authentic Ruud device. Order with confidence, knowing you'll receive top quality pool equipment.

  • 26 Natural Gas Low NOx Digital Heater 399K BTU 10025 - AquaDoc
1 1

#26 Natural Gas Low NOx Digital Heater 399K BTU 10025

#26 Natural Gas Low NOx Digital Heater 399K BTU 10025

$4,239.99
$5,089.99 $4,239.99
Sale Sold out
Shipping calculated at checkout.
Ruud Pool Heaters

High-efficiency 399K BTU pool and spa heater with digital controls, designed for durability and year-round performance.
Product Details

The Ruud P-D337A 399,000 BTU Natural Gas Low NOx Digital Heater offers powerful and efficient heating for pools and spas, designed to meet strict federal and state emissions standards.
Its rugged construction with copper tubing and polymer headers delivers long-lasting performance in both residential and commercial applications.
The unit is engineered to maintain peak performance in harsh conditions, including wind, rain, debris, and even snow.
With a digital electronic control system, it offers precise temperature management and reliability across all seasons.
Energy-smart technology and an ASME-certified build make it a safe, cost-effective, and high-performing choice for pool and spa heating.
Ideal for both indoor and outdoor setups, this unit handles maximum flow rates up to 125 GPM and operates efficiently at elevations up to 5,000 feet.

AI Review Summary ✨

⭐⭐⭐⭐⭐

Customers highlight the excellent heating speed and energy efficiency, noting significant savings over time.

Many pool owners found the unit to be incredibly durable, even when exposed to debris, cold weather, and heavy use.

The digital controls are frequently praised for making temperature adjustments intuitive and reliable.

Reviewers also appreciate that the installation process is straightforward with clear guidance from the manual.

Users say it delivers professional-grade results in both home and commercial settings, making it well worth the investment.
Features
  • BTU Input: 399,000
  • Fuel Type: Natural Gas
  • Low NOx Emissions: Meets or exceeds all regulatory standards
  • Control Type: Digital electronic for precise temperature settings
  • Construction: Polymer headers with durable copper tubing
  • Performance: Maintains heating power through wind, rain, and debris
  • Application: Suitable for both residential and commercial pools and spas
  • Mounting: Compatible with indoor or outdoor installation
  • Energy Efficient: Energy-smart technology with high efficiency ratings
  • Certification: ASME certified for safety and compliance
Specifications
  • Brand: RUUD
  • Application: Pool, Spa
  • Shipping Dimensions: 38 x 34 x 30 inch
  • BTU Input: 399,000 British thermal unit
  • Burner Orifice Size: #26
  • Cabinet Depth: 28 inch
  • Cabinet Height: 31.8125 inch
  • Cabinet Width: 29 inch
  • Channel: Pool Equipment
  • Commercial, Residential, or Professional: Commercial, Residential
  • Control Type: Digital Electronic
  • Each Product Weight: 238 pound
  • Elevation Max: 5000 foot
  • Elevation Min: 0 foot
  • Flow Rate Max: 125 gal/min
  • Flow Rate Min: 125 gal/min
  • Flue Diameter: 9 inch
  • Frequency Rating (Hz): 60
  • Fuel Type: Natural Gas
  • Gas Connection: 0.75 inch
  • Gas Connection FIT: NPT
  • Green or Energy Efficient Product: True
  • Header Material: Polymer
  • High Altitude Model: False
  • Indoor Drafthood: 58.5 inch
  • Minimum J: 12.5 inch
  • Minimum Sell Quantity: 1
  • Phase: Single
  • Stackless Outdoor Top: 34 inch
  • Standards Approvals: ASME Certified
  • Tubing Material: Copper
  • Voltage: 115V, 230V
  • UPC Code: 840891014867
User Guides
Frequently Asked Questions

Q: Can this heater be used for both pools and spas?
Yes, the Ruud P-D337A is designed for dual use and performs well in both pool and spa environments.

Q: Is this heater suitable for high altitude areas?
It operates efficiently up to 5,000 feet in elevation but is not a high-altitude-specific model.

Q: Can it be installed indoors and outdoors?
Yes, it’s compatible with both installation types; however, the appropriate drafthood or stackless top must be used.
Warranty
Warranty URL: https://www.ruud.com/warranty/
View full details
Disclaimer:
Pool heaters and heat pumps are not returnable once installed or connected. Double-check fuel type, voltage, and sizing before installation.

The price you see is the price you pay.
We don’t play pricing games.
That’s why all orders over $75 ship free—no tricks, no hidden costs.

Why choose AquaDoc?

  1. 🌟 Top-notch products designed by leading pool & spa brands.
  2. 📦 Proudly ship locally from the USA, ensuring faster delivery.
  3. 👷‍♂️ Every purchase supports American income and jobs.

Order With Confidence

Satisfaction guaranteed! We're here to help with any pool or spa related issues. Contact us anytime for assistance.

Free shipping on all orders over $75!  

As seen on

1 5

Ruud offers high-performance pool and spa heaters engineered for efficiency, reliability, and long-term value. Whether you're heating a residential pool or a commercial spa, Ruud systems are built to deliver consistent temperature control with lower energy costs. At AquaDoc, we provide a variety of Ruud pool heaters to help you enjoy warm water and extend your swim season with confidence.

You may also like