Hayward W3H250FDN Universal H-Series 250,000 BTU Natural Gas Pool and Spa Heater for Inground Pool Heating
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Availability:
In Stock.
Arrives
Apr 28 – Apr 29
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Size: 250,000 BTU (W3H250FDN)
Features
- EASY TO USE: Intuitive inground pool heater control panel enables easy operation and maintenance. The digital LED display helps maintain pool water temperature while monitoring pool water heater performance with self-diagnostic capabilities
- MULTIPLE COVERAGE OPTIONS FOR POOLS AND SPAS: This gas pool heater and pool and spa heater suits in-ground pools and spas up to 750 sq ft with a natural gas connection; additional models cover 400, 600, or 1,200 sq ft
- ENERGY SAVING AND BUILT TO LAST: Efficiently designed pool heater for inground pools helps deliver consistent hot water for swimming pools, reduce pump run time for energy savings, and protect against corrosion caused by unbalanced water chemistry
- SIMPLE INSTALLATION: This 250,000 BTU Hayward natural gas pool heater allows flexible gas and electric connections on the right or left side, with an H-Series built-in 3/4" gas connection for easier fuel line setup
- LOW ENVIRONMENTAL IMPACT: Hayward gas pool heaters for inground use are certified for low-NOx emissions and eco-friendly operation, reducing circulation pump run time while delivering a reliable swimming pool heater solution for inground pools
Description
The Universal H-Series 250,000 BTU Natural Gas Pool & Spa Heater from Hayward provides reliable, long-lasting comfort for pools and spas with a surface area of up to 750 ft. Built with a durable cupro nickel heat exchanger, it offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry, ensuring you get season after season of premium heating performance. The Universal H-Series boasts industry-leading hydraulic performance coupled with lightning-fast speed-to-heat capability—so you spend less time waiting, and more time swimming. Its low NOx emissions meet air quality standards in all low-NOx areas, so you can rest easy knowing its environmental impact is low, too.
Product Dimensions: 29.5 x 25 x 24 inches
Item Weight: 171 pounds
Manufacturer: Hayward
Item model number: W3H250FDN
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Apr 28 – Apr 29
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Size: 250,000 BTU (W3H250FDN)
We recently installed this heater to go with our Core 35 which is $1,400.00 itself to convert to a pool salt system. Usually our pool is cloudy but since going to salt it’s cleared up considerably. We decided to install a heater after talking about doing so for years now as the pool is almost always cloudy during the summer and Generally we can only swim May - September due to the water getting to chili in October- April. We are hoping with this heater to extend our swimming season to 11 months out of the year. It took roughly 4 days to install it So it was a little hard to hook up we had to run gas lines literally all over the side of our house and through our attic and underground to get to our heater as you can see from the pictures. We tested it out the first night and overnight it warmed our pool from 65* to 80*F, Def can feel the warm water coming out of the jets. Looking forward to trying this out more in October and November when temperatures really drop down but so far I’m pleased with it. Spent roughly $1,200.00 in labor to get the work done and another $800 in parts, like gas line pipes, fittings plumbing and valves… thankfully lowes was able to cut and put the fittings on our gas lines for us but I would say this is a minimum $4,500.00 project undertaking perhaps a bit more if using a pool company, professional plumber or if you live in a big city. We got the 250,000 btu heater and our pool is roughly 22,500 gallons which maybe overkill but wanted to go to big rather than to small on a nice heater…Just wanted to throw that out there for anyone considering getting one installed. That price includes the cost of the unit. The unit really isn’t loud. Update we have had it a little over a week now and we love it! We are in the pool almost daily now. I generally keep the heater on 78* degrees and when I get off work and home around 530pm I’ll cracked it up to 104* and by 7:30pm it’s over 94*! Talking about nice and relaxing I could literally sit in the pool as if it were a hot tub! Updated after a month we are in October now and still like the heater. Gas bill was about $60 more than it normally is for this time of the year and we generally keep the heater on 82F in the pool. One issue we have had is the heater will show the code LO every now and then and will go into a protection mode and will not work until you backwash and let the pressure out
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Reviewed in the United States on September 16, 2022 by wkmgator
Size: 250,000 BTU (W3H250FDN)
The media could not be loaded. After weeks of back and forth voomi supply is blaming instalation. DO NOT BUY FROM THEM. I've installed over 15 of these and they are blaming me....this unit didn't last more then 2 months how can they say due to installation they won't warranty it and it's a internal components that went bad COMPLETE BS!!!!
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Reviewed in the United States on September 28, 2024 by anthony schaefer
Size: 250,000 BTU (W3H250FDN)
Great so far!
Reviewed in the United States on April 15, 2026 by GrannyCat
Size: 250,000 BTU (W3H250FDN)
Really good heater. Super efficient at heating up our 40’ x 25’ in- ground pool. Works perfect. Was an easy install and super fast shipping. I received it two days after ordering! Recommended.
Reviewed in the United States on August 19, 2023 by O.jay
Size: 250,000 BTU (W3H250FDN)
it went in great
Reviewed in the United States on November 14, 2025 by dean wall
Size: 250,000 BTU (W3H250FDN)
This is an excellent heater - well built, efficient. Spa attached to the pool rose 35 degrees in under an hour. Unlike many other products, the unit sits on hard plastic legs. My prior unit rusted from the bottom up due to metal bottom directly on the equipment slab. I note this is not an installation for amateurs. I have significant pool, gas, plumbing and electrical installation experience, and this took every bit of it to reconfigure from my prior unit.
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Reviewed in the United States on January 11, 2021 by I was there
Size: 250,000 BTU (W3H250FDN)
The media could not be loaded. Stay away at all costs. I bought this Hayward heater about a year ago and after about 6 months of total use the heat exchanger failed in 4 different spots right at the joint of the elbows. After looking online I have found that this is an ongoing problem with these units as every picture I have seen they form leaks in the same exact place. I contacted Hayward as they state that the unit is covered for 3 years and was given the runaround. So I am now out 3500 dollars on a unit that lasted less than a year of use.
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Reviewed in the United States on September 17, 2025 by James
Size: 250,000 BTU (W3H250FDN)
This heater is used primarily to heat my hot tub water, however, it could also heat the pool. The design is such that with a few simple steps one can connect the electrical, ground, and gas to either the right or left side of the heater. It is quiet and does a superb job at what it's designed to do. It's no wonder it's rated as a top product. I would recommend this heater.
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Reviewed in the United States on August 26, 2020 by Dennis Ottley