By Hayward Pool Products
Part # W3H200FDN
Warranty 1-Year Parts-Only Warranty
Hayward® Universal H-Series Low NOx Pool & Spa Heater – W3H200FDN
200,000 BTU | Natural Gas | Cupro Nickel | In-Ground Pools & Spas
The Hayward® Universal H-Series sets the standard for energy-efficient, eco-friendly pool heating with Low NOx emissions, advanced hydraulic performance, and a Cupro Nickel heat exchanger designed for superior durability — even in saltwater or aggressive water chemistry environments.
With its compact, low-profile design, the W3H200FDN model offers ultimate installation flexibility with right or left-side connections for gas, water, and electricity, and unions designed for 2" or 2.5" CPVC plumbing.
Key Features:
Cupro Nickel Heat Exchanger – Enhanced durability against corrosion and salt-based water systems
Low NOx Emissions – Meets California and Texas air quality standards
Forced Draft Combustion System – Maintains consistent airflow for reliable performance regardless of weather conditions
"V" Baffle Design – Patented single-header design for faster heating and reduced condensation
LED Digital Control Panel – Simple diagnostics and temperature control for easy operation
Polymer Header – Resists erosion and improves hydraulic efficiency in high-flow plumbing
Flexible Install – Independent left or right side electric, water, and gas hookups
Specifications:
Model: W3H200FDN
BTU Output: 200,000
Fuel Type: Natural Gas
Plumbing: 2" x 2.5" CPVC unions
Ignition: Electronic
Application: In-ground pools and spas
Emissions: Low NOx compliant
Heat Exchanger Material: Cupro Nickel
Warranty:
1-Year Limited Warranty (Parts Only)
Overall Dimensions
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.
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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?
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.
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4 to 8 hrs
Screwdriver, Socket Set, Adjustable Wrench, Hacksaw
2 0
My pool did not have a heater so this was a more involved install than most of my other purchases. The heater comes well packaged on a wood pallet. After moving into place I had to make several PVC sections fit my pool pad and equipment.
The gas feed connection was the most difficult part. Use only gas line Teflon tape (yellow) for this connection. Once connected and plumbed I wired this back to my Hayward Logic Pro system.
Control setup was just as the manual said. The heater fired the first time and has made my pool enjoyable earlier and later than ever before. This is my second year with this heater and it works just as well as the day I installed it. Just be careful to keep your water chemistry right and the heater should have a long life.
