By Hayward Pool Products
Model # H250FDNASME
Warranty 3 Year
Hayward H-Series ASME Commercial Gas Heaters
Low-NOx • ASME Certified • Cupro Nickel Heat Exchanger
The Hayward H-Series ASME Gas Heater is purpose-built for commercial pool and spa applications, offering unmatched performance, efficiency, and reliability. These heaters are ideal for hotels, health clubs, community centers, and any high-use aquatic facility requiring powerful heating and durable construction. Each unit is ASME certified and designed for maximum hydraulic efficiency and low-NOx emissions, aligning with stringent air quality regulations.
Available Models:
BTU Ratings: 250,000 | 400,000 | 500,000
Fuel Options: Natural Gas or Propane
Key Features:
✅ Cupro Nickel Finn Plate Heat Exchanger with Bronze Header
Industry-standard for corrosion resistance and thermal efficiency.
✅ ASME-Certified Pressure Relief Valve
Installed on all models for safety compliance and peace of mind.
✅ Low-NOx Emissions
Environmentally conscious design meets commercial air quality standards.
✅ Flexible Connections
Independent left or right-side hookups for electric, gas, and water.
✅ Heavy-Duty CPVC Plumbing Connections
2" x 2.5" CPVC unions for high flow capacity and chemical resistance.
✅ User Access Controls with Lockout
Prevents unauthorized configuration changes.
✅ Easy Installation & Serviceability
All controls accessible through a single front panel.
✅ Dual Voltage Capability
Simple conversion between 120V and 240V with a fuse-protected circuit board.
✅ 3-Year Commercial Warranty
Applications:
Commercial Pools
Spas and Therapy Pools
Hotels, Resorts, and HOA Facilities
Health Clubs, Gyms, and Recreation Centers
Retrofit or New Installations
How do you know if a pool heater is a propane heater or a natural gas heater?
Reply
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.
Reply
Will a gas heater operate at the low speed of a dual speed motor?
Reply
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.
Reply
What is the difference between an Electronic and Millivolt ignition?
Reply
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.
Reply
Is a vent required for typical outside installation for the Hayward 150k Ng Lo Nox heater?
Reply
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.
Reply
