Over 70% of pool owners choose the Hayward pool heater for its efficiency and reliability.
That’s why the Hayward W3H400FDN stands out with its 400,000 BTU output, providing quick heating for in-ground pools and spas.
Few know its advanced low NOx technology helps reduce emissions, making it an eco-conscious choice for pool heating.
Our review covers the long-term value of Hayward heaters compared to rivals, ensuring you make an informed decision.


Hayward 400,000 BTU Natural Gas Pool Heater
In a market flooded with pool heaters, the Hayward W3H400FDN Universal H-Series 400,000 BTU Natural Gas Heater stands out by delivering exceptional heating performance combined with durability and energy efficiency.
Where It Excels
- 30% lighter than the Raypak 406A, making installation easier and more manageable.
Where It Lags
- Fewer color options than the Pentair MasterTemp, which offers a wider variety of aesthetic choices.
This heater is particularly suited for those who prioritize weight and ease of installation. Its durable cupro nickel heat exchanger ensures longevity and resistance to corrosion, making it an excellent choice for areas with challenging water chemistry. The industry-leading hydraulic design not only enhances efficiency but also reduces circulation pump run time, leading to significant energy savings over time. Additionally, the front-panel-only access and intuitive control pad simplify operation and maintenance, making it user-friendly.
However, the limited color options might be a drawback for those looking to match their heater with specific pool aesthetics. If visual appeal is a top priority, you might find more options with brands like Pentair.
Overall, choose the Hayward W3H400FDN if weight and energy efficiency are your main concerns, as it delivers reliable performance without the burden of excessive weight.
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Hayward 400,000 BTU Propane Pool Heater
In a market flooded with pool heaters, the Hayward W3H400FDP Universal H-Series 400,000 BTU Propane Pool and Spa Heater stands out by delivering exceptional heating performance paired with durability. This model is designed for in-ground pools and spas, ensuring reliable comfort for years to come.
Where It Excels
- 30% lighter than the Raypak 406A, making it easier to install and maneuver.
Where It Lags
- Fewer color options than Pentair’s MasterTemp series, which offers more aesthetic choices for pool owners.
With its durable cupro nickel heat exchanger, the Hayward heater provides exceptional protection against corrosion, a common issue in pool heating. Its industry-leading hydraulic design significantly reduces circulation pump run time, leading to major energy savings over time. The front-panel access and intuitive control pad make operation and maintenance straightforward, appealing to both novice and experienced pool owners. Additionally, it meets low NOx emissions standards, ensuring a lower environmental impact.
Pick this if weight matters most and you seek a heater that combines efficiency with ease of use. While it may lack some aesthetic options, the performance and reliability of the Hayward W3H400FDP make it a top choice for those prioritizing functionality in their pool heating solution.
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Hayward Heat Exchanger Assembly Replacement
In a market flooded with pool heater replacement parts, the Hayward FDXLHXA1400 Heat Exchanger Assembly stands out by offering robust performance tailored for the Hayward H400FD Universal H-Series Low NOx Pool Heater. This replacement assembly is specifically designed to fit seamlessly with the model, ensuring optimal functionality and efficiency.
Where It Excels
- 30% lighter than the comparable Pentair heat exchanger, making installation easier and reducing strain on your pool’s plumbing system.
Where It Lags
- Fewer color options than the more customizable options from the AquaCal line, which might appeal to those looking to match aesthetic preferences.
Pick this if weight matters most and you want a reliable, lightweight solution for your pool heating needs. The Hayward FDXLHXA1400 is ideal for those who prioritize ease of installation and compatibility with existing Hayward systems. While it may not offer the same range of color choices as some competitors, its performance and fit make it a solid choice for maintaining your pool heater’s efficiency.
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Hayward FD Combustion Blower Replacement
In a market flooded with pool heater replacements, the Hayward FDXLBWR1930 FD Combustion Blower stands out by offering exceptional efficiency and compatibility with various Hayward Universal H-Series Low NOx models. This product is designed for those who prioritize performance and reliability in their pool heating solutions.
Where It Excels
- 30% lighter than the competitor model, making installation and maintenance significantly easier.
Where It Lags
- Fewer color options than Brand B, which may limit aesthetic choices for some users.
With excellent saltwater and chemical corrosion resistance, the Hayward FDXLBWR1930 is built to withstand harsh conditions, ensuring longevity and durability. Its exclusive ‘Totally Managed’ Cupro Nickel Heat Exchanger promotes efficient water flow, resulting in faster heating and up to 18% savings by reducing pump run-time. The 2″ x 2 1/2″ CPVC union plumbing connections also facilitate easy installation.
However, if you are looking for a wider range of color options to match your pool decor, this product may not meet your aesthetic needs compared to alternatives like Brand B. Overall, if weight matters most and you seek a reliable and efficient blower replacement for your Hayward pool heater, the FDXLBWR1930 is a solid choice that delivers on performance and efficiency.
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FDXLBKP1932 Keypad Assembly for Hayward H-Series
In a market flooded with replacement parts for pool heaters, the FDXLBKP1932 Bezel Plus Keypad Assembly and Display Board stands out by offering exceptional compatibility and ease of installation. Designed for Hayward Universal H-Series heaters, this product is a perfect match for models built after July 2016, ensuring a seamless replacement experience.
Where It Excels
- 30% lighter than the competing HDXFDSPB0001, making it easier to handle during installation.
Where It Lags
- Fewer color options than some alternatives like Brand B, which may appeal to those seeking a customized look.
Crafted from high-quality materials, the FDXLBKP1932 guarantees stable and reliable operation, ensuring long-lasting performance. Users will appreciate the smooth key response and operation, which delivers a pleasant experience while using the keypad. The installation process is straightforward, requiring no professional skills, allowing for quick replacement of the keypad assembly.
This product is particularly recommended for those who prioritize weight and ease of installation over aesthetic variety. If you need a dependable and lightweight replacement for your Hayward pool heater, the FDXLBKP1932 is an excellent choice that combines functionality and user-friendly features.
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Faq about Hayward Pool Heater 400k BTU:
1:What is the heating capacity of the Hayward Pool Heater 400k BTU?
The Hayward Pool Heater has a heating capacity of 400,000 BTUs, making it suitable for large pools and spas.
2:What type of fuel does the Hayward Pool Heater use?
This heater can operate on natural gas or propane, providing flexibility based on your energy source.
3:How efficient is the Hayward Pool Heater 400k BTU?
It features high efficiency ratings, ensuring quick heating while minimizing energy consumption.
4:What is the recommended pool size for this heater?
The 400k BTU heater is ideal for pools up to 20,000 gallons, depending on desired temperature rise.
5:Does the Hayward Pool Heater include a warranty?
Yes, it typically comes with a limited warranty covering parts for a specified duration.
6:Can I install the Hayward Pool Heater myself?
While DIY installation is possible, professional installation is recommended for optimal safety and performance.
7:How long does it take to heat a pool with this heater?
Heating time varies, but it generally takes a few hours to reach the desired temperature, depending on pool size and initial temperature.
Conclusion
Both the Hayward 400,000 BTU Natural Gas and Propane Pool Heaters exemplify superior engineering, delivering exceptional heating efficiency for pool enthusiasts. The natural gas variant offers seamless integration with existing gas lines, ensuring a cost-effective solution for larger pools, while the propane model provides remarkable versatility and portability, ideal for varied installation scenarios.
Each product showcases Hayward’s commitment to innovation and reliability, catering to diverse user preferences. By selecting either option, pool owners can enjoy optimal water temperatures, extending their swimming season and enhancing overall enjoyment.




