By Hayward Pool Products
Model # H500FDNASME
Warranty 3 Year
Hayward H-Series ASME Commercial Gas Pool Heater
High-Efficiency • Low-NOx • ASME Certified
The Hayward H-Series ASME Gas Heater is the premier choice for commercial pool and spa applications. Designed and certified specifically for demanding environments, this flagship heater delivers superior hydraulic performance, energy efficiency, and long-term reliability. Built with advanced low-NOx technology, it meets strict air quality standards while minimizing environmental impact.
Perfect for both new installations and retrofits, the H-Series offers multiple BTU configurations and flexible plumbing and electrical connection options, making it one of the most versatile commercial heaters on the market.
Available Models:
BTU Ratings: 250,000 | 400,000 | 500,000
Fuel Types: Natural Gas or Propane
ASME Certified: Yes
Key Features:
Patented Cupro Nickel Finn Plate Heat Exchanger with Bronze Header
Superior corrosion resistance and durability in harsh water conditions.
ASME Pressure Relief Valve
Included as standard on all models for safety compliance.
Flexible Installation
Independent left or right-side gas, water, and electric connections for maximum versatility.
Heavy-Duty CPVC Plumbing Connections
2” x 2.5” union fittings accommodate high-flow systems.
Electronic Lockout Feature
Protects configuration settings from unauthorized access.
Single-Panel Access
Easy service and installation via intuitive front-panel access.
Dual Voltage Conversion
Built-in fuse-protected circuit board allows for 120V or 240V operation with easy setup.
Low-NOx Emissions
Environmentally responsible, compliant with commercial air quality regulations.
3-Year Limited Warranty
Covers both parts and labor for commercial use.
Ideal Applications:
Hotels, Motels, and Resorts
Apartments & Condominiums (HMAC)
Spas & Therapy Pools
HOA and Municipal Pools
Commercial Aquatic Facilities
How do you know if a pool heater is a propane heater or a natural gas heater?
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Typically in the product name we use the abbreviation of "LP" for propane or "NG" for natural gas. Click here for a full listing of our >Pool Heaters.
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Will a gas heater operate at the low speed of a dual speed motor?
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Probably not - Most gas heater will shut off at low GPM levels (20-40) to keep the heater cores from overheating - 20 for 200 BTUs, 40 for 400 BTUs. Depending on your pool system you might get these GPM levels at the low speed but generally these heaters must be run at the motor's high speed.
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What is the difference between an Electronic and Millivolt ignition?
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The basic answer is that Millivolt is the old style of ignition, using a standing pilot light. While the electronic ignition uses a spark start system like a gas grill. Electronic ignitions are more efficient in gas usage and also are better suited for high wind areas where a pilot light might get extinguished.
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Is a vent required for typical outside installation for the Hayward 150k Ng Lo Nox heater?
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For the Hayward Lo Nox heater, you would not need to purchase an additional vent if you are using it outside. If you are installing the heater outside, we recommend you purchasing a heater cover. This will protect your heater from debris, rain, snow, heat- or pretty much anything that could get caught in your heater. The Weather-Out Pool Heater Cover can be viewed on our website.
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