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Hayward

Hayward Pool Heater for Inground Pools Universal H-Series 150,000 BTU (Natural Gas Pool Heater) Pool and Spa Heater W3H150FDN Replacement for H150FDN

  • Based on 563 reviews
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Size: 150,000 BTU (W3H150FDN)


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 450 sq ft with a natural gas connection; additional models cover 600, 750, 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 150,000 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

These swimming pool heaters-specifically the Universal H-Series 150,000 BTU Natural Gas model from Hayward-deliver reliable, long-lasting comfort for pools and spas up to 400 ft. Serving equally well as a versatile pool and hot tub heater, the unit offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry,ensuring season after season of premium heating performance. Industry-leading hydraulic design combines with lightning-fast speed-to-heat capability, so users spend less time waiting and more time swimming. Ideal to maintain water temperature and extend swim season into spring, fall, or evening swims, the Universal H-Series also meets strict low-NOx air-quality standards with minimal environmental impact.

Product Dimensions: 29.5 x 19 x 24 inches


Item Weight: 150 pounds


Manufacturer: Hayward


Item model number: W3H150FDN


Frequently asked questions

The Hayward Universal H-Series heater operates on natural gas, making it energy efficient and economical.

Yes, the heater is designed to keep the water warm in both in-ground pools and spas, providing a comfortable swimming environment irrespective of the weather.

As the name indicates, this Hayward heater has a heat output of 150,000 BTU, allowing it to heat up a large amount of water quickly and effectively.

While it's generally recommended to have a professional install it due to the complexity of gas-fueled appliances, the straightforward design of the heater does allow for do-it-yourself installations if you're handy and follow all safety precautions.

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Top Amazon Reviews

🚀 Abunda's Overview

This is our summary and key points to consider based on customer reviews.

The Hayward Gas Heater gets a generally positive review from most customers. Reviewers highlight its easy installation process, excellent power in elevating their pool's temperature swiftly, and much lower electricity bills. Nevertheless, several customers mentioned encountering issues post-installation with warranty service and certain units had manufacturing defects leading to early failure or damage.

Pros

  • 👍 Easy to install
  • 🔥 Heats the pool quickly
  • 👌 Direct replacement for older models
  • 💰 Big savings on electricity bills compared to heat pumps

Cons

  • 👎 Poor customer service and warranty handling
  • ⚠️ Some units have manufacturing defects
  • ☹️ Expect some issues with durability

Should I Buy It?

If you are well-prepared to potentially deal with initial hiccups post-installation and less than stellar customer service, the Hayward Gas Heater is a solid choice for its heating performance and would notably save on your energy bills compared to traditional heat pumps. However, for long-term peace of mind and better post-sales service, you might want to explore other brands.

    • Easy swap of pool heater.
Size: 150,000 BTU (W3H150FDN)
Three year old Hayward gas heater started leaking heater core with steam emitted. New heater easy replacement with water connections and natural gas connection in same positions. Quickly disconnect old heater and connect new heater. With price of natural gas increasing just wish new heater was more efficient. ... show more
Reviewed in the United States on May 6, 2026 by Richard W. Tribou
    • The Hayward Natural Gas unit is NO# 1
Size: 150,000 BTU (W3H150FDN)
I purchased the 150,000 BTU natural gas unit on sale in late May. I installed the unit with my friend that is a licensed NYS electrician. The install was quite easy. I actually fired it up in minutes once we completed the installation. My pool holds 20,000 gals of water, the actual water Temperature at start up was 74 degrees. I ran the pool pump & Heater from 11:30 PM To 6:00 AM. In the 7 hours time the pool Temperature Rose from 74 degrees to 92 degrees, that is a rise of 18 degrees in 7 hrs. The ambient outside Temperature was 63 degrees, I did NOT use my solar pool cover for this test. This LITTLE hayward heater is a DYNOMO. For the past 7 years I had a 110k electric heat pump and it to 5 days to reach the above temperatures. I purchased it on Amazon for $4195 Biggest WASTE OF MONEY in the north east. I made the switch for the above reasons and MOST OF ALL MY ELECTRIC BILL was $810 a MONTH with that Stupid heat pump. I even called my electric company and spoke to the Director of Engineering which is my equivalent and he agreed heat pumps are NOT as economical as alot of the so called experts say. Lastly the Hayward 150k BTU heater is a FIVE STAR in my professional opinion. ... show more
Reviewed in the United States on July 13, 2023 by eddie macina
    • Easy to install and use
Size: 150,000 BTU (W3H150FDN)
Hi, I recently installed this with the help of a friend, I decided to go with the Hayward this time around and am very pleased with my decision. Easy to install and user friendly, it heats my 8 ft inground spa just fine! Was happy with my purchase !
Reviewed in the United States on June 15, 2023 by steven f.
    • Hayward pool Heaters are junk !!
Size: 150,000 BTU (W3H150FDN)
I bought Hayward 150,,000 btu pool heater for my above ground pool 13,500 gallon . I installed the heater according to installation instructions and local codes. The heater worked for 4 hours and would start again the error code was LO . The company I purchased the heater from was In the swim which is owned by Dohenys Enterprises . The seller agreed to pick up the heater and they did on 7/2/25 and I’ve contacted in the swim twice last week through Amazon messaging and I still haven’t received a refund yet. Before I sent the heater back I contacted Hayward warranty service and all they did is give me the name of 2 companies that could fix my heater. 1 company said they don’t service above ground pools and the other company said that my location was to far to service. I read the warranty and it only covers parts only and pool companies in my area charges $ 225.00 an hour plus parts. I think Hayward pool heaters are junk and I will never purchase a Hayward pool heater again. Today I called Amazon customer service and they will issue a refund in 7-10 business days only because I used my Amazon prime Visa card. ... show more
Reviewed in the United States on July 14, 2025 by Gary H
    • unit quit and asurion 2 year warranty is worthless they charged me but don't cover this
Size: 150,000 BTU (W3H150FDN)
Hayward has no one to help in my area with a warranty as its brand-new gives code BD...so now i will request a credit on my so called worthless warr. and pay for the repairs as can't get any help from Hayward with the problem. crazy cuz i'm in Florida and pools are common here and the hayward locator gave me one dealer and they said sorry can't help with a gas heater ... show more
Reviewed in the United States on September 26, 2023 by Don C
    • Phenomenal heater
Size: 150,000 BTU (W3H150FDN)
Phenomenal heater. Almost gave it Four stars for not aligning pipe sizing for gas OR water, but if you can't change that easily then you shouldn't be buying it and installing it yourself
Reviewed in the United States on December 4, 2025 by Chris K.
    • works well so far
Size: 150,000 BTU (W3H150FDN)
installed it last week, took a bit of work to figure out fittings required for the inflow and outflow lines and if you are running off 110 you need to make sure to swap the 240 plug for the 110. but the pool is warm and the heater hasn't had any errors yet
Reviewed in the United States on June 3, 2021 by Amazon Customer
    • Aesthetic
Size: 150,000 BTU (W3H150FDN)
Nice compact and aesthetic for pool area. Great price, 13500 gallon pool
Reviewed in the United States on August 25, 2025 by Kirk Madsen

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