Part # W3H400FDP
Warranty 1 Year
Manufacturer Code H400FDP
Universal H-Series Low NOx Heaters
For In-Ground Pools and Spas - Electronic Ignition Dual Thermostat
Now With Cupro Nickel Heat Exchanger!
NEW Hayward Universal H-Series Low NOx heater combines industry-leading hydraulic performance; environmentally responsible low NOx emissions and a standard cupro nickel heat exchanger with a low profile appearance, lighter weight design, independent left or right side electric, water and gas connections plus 2" x 2 1/2" CPVC union connections to provide the ultimate installation flexibility for new or existing equipment pads.
It also includes a forced draft system that constantly moves air through the combustion chamber at a precise flow rate. As a result, all outside weather variables that can affect the heating performance, such as wind conditions, are eliminated - without having to install a high-wind stack.
NOTE: The Hayward Universal H-Series heaters meet the NOx Emission standards set by the California South Coast Quality Air Management Commission for 2001 and the Texas Natural Resource Conservation Commission Code.
Applications:
Overall Dimensions
How is the heater started. Does it need to be plugged in or does it have a gas grill type ignition starter?
Thanks Rich
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Hi, Rich. This unit requires electricity in order for the unit to function. It does also have an electronic ignition system.
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I have a large spa only that currently does not have a heater (old one has been removed.) I am looking at this or the Hayward 500K BTU unit. Can you confirm the efficiency of this over the 500? Is the 500 worth the extra money?
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Good Afternoon- Normally, the higher the BTU the more efficient the heater. The efficiency comes from the length of time it would take to heat your pool. The higher the BTU, the faster your water will be heated. The faster your water heats up the less time your heater has to run and less power or gas that it has to use. Between the Hayward Universal H-Series Low NOx Heater 400K BTU - LP - H400FDP and the Hayward Universal H-Series Low NOx Heater 500K BTU - LP - H500FDP, you won't see much difference in efficiency.
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im looking for a heater or chiller i live in oklahoma trying to figure out if i need both or just heater.my pool is 43 x 16 lazy l with steps. 8ft to 4ft could you advise on the best one im totaly electric but thinking i would install a propane tank if needed
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Hi, William. You can use a Heat/Cool Heat Pump which will heat your pool in the spring and fall then cool in the summer. You may need to supplement the heat pump with a gas heater depending on how fast you want the pool heater.
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I recently purchased a Hayward heater, 400k BTU. All my pool plumbing is 1 1/2" PVC the inlet and outlet on the Hayward is 2" - Is it okay to use a 2" to 1 1/2" reducer in order to connect this to my existing plumbing?
thank you
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Yes, that is a common adjustment that is made on some pool systems.
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I am looking to replace a Hayward H400IDL2 with an H400FDP unit. Are the water inlet/outlet locations the same on both units or will I have to do some plumbing to install? One recommendation I received while researching a replacement was going with the same manufacturer, the alignment should be the same.
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Hello, I currently have a Jandy LX 399,000 BTU heater (approx 10 years old). The replacement part I need for it is no longer available so I need to buy a new heater. I am looking at the Hayward H400FDP as a replacement for it. My existing unit has 2" inlet and outlet ports, but I see that the Hayward unit has (1) 2" connection and (1) 2 1/2" connection. Will it be ok for me to install this unit with a 2" x 2 1/2" reducer to my existing piping?
Thank you
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Hi Dave, yes it will be fine to install the Hayward heater as you described and the H400FDP would be a great replacement for the Jandy LX heater.
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Is there an efficiency rating on this heater? Does it vary much among major brands?
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Hi Bob, This heater is rated at 84% Efficient which is one of the higher ratings. There really is not much of a difference between the major brands as they range from 82% - 84% Efficient.
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Can this heater be installed inside a equipment house if ventilated?
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Hi, This heater can be installed indoor with the proper ventilation kit. The ventilation kits are listed on the Hayward Heaters page.
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i'm trying to change the heater controller on the faceplate of the heater , but i can't find the part number.
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Hi, You can locate the controller and all available replacement part for this unit via the Hayward Universal H Series Low Nox Heaters Parts page.
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hi... i have the hayward h400 ( millivolt ?) propane heater. its more square than the one in this picture. the heater element needs replacing and its very expensive( $1000 bucks plus installation). i thought it more wise to replace the heater since it is already 14 years old. which do you recommend. pool is in ground 45X25. thanks
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Hi Louie,If you're wanting another Hayward propane heater the part number H400FDP would be the one you'd want to go with. If you're looking for a recommendation, I would recommend the RayPak 406,000 BTU which is part number PR406AEP.
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Hello,
We need to replace our Hayward H400 with a new unit. Will this unit work perfectly with the Goldline/Hayward pool automation system, mainly being able to control from the Aquapod?
Thanks
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Hello Shawn, if you have full Hayward automation it will pair up with this Hayward heater where you can control the temperature and switch between pool and spa modes.
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how do i know what size (btu's) heater I need for my pool ?
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Hi Chris we address this question about 1/2 down this page How Do I Size a Heater For my Pool. If you have any addtional questions after looking at that page then let us know, but I think this page should help out quite a bit.
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I want to install the Hayward Lownox heater on my pool but I live in the mountains at 3,000 foot elevation; do I need to buy a special high elevation heater?
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Hello George, The Hayward Universal Low Nox are self adjusting up to 10,000 feet of elevation. Any installation above 2,000 feet will require a special restriction plate to be installed. Luckily, that plate comes standard with every heater so no need to purchase it separately.
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Is there a difference between "H series" and "Universal H series" if so what is it?
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Rich- the H series is the older model to the Universal H series. The H-series is now only available in smaller millivolt and above ground models. The H-series inground models come with a cupro-nickel heat exchanger and the above ground comes with a standard one piece copper exchanger. Whereas the Universal H-series all come standard Digital with a curpo-nickel heat exchanger as well as Low NOx.
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How can I tell the difference between a Propane or Natural Gas heater listed on your website?
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A heater's model number will usually end with an 'N' or a ''P' to denote the gas type. if the model number is only numbers we also have the gas type in the description of the product. The abbreviations "NG" is for natural Gas and "LP" is form Liquid Petroleum, also called Propane.
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The Most Helpful Review
18 0
(5 out of 5 stars) Awesome Heater
Reviewed By: Tiffany4004 from Jackson, NJ ()
Pros: Price, Works Quickly, Effective
Cons: nothing
This heater is awesome..It works so quickly and it is very easy to use..It was also cheaper on inyopools.com then other websites.. I love it !
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The Most Recent Reviews
2 0
(5 out of 5 stars) Hayward H400FDP Pool Heater
Reviewed By: Lodewyk S. from West Palm Beach, FL ()
Pros: Quiet, Efficient heater
Cons: Plastic end panels - time will tell.
I purchased this unit to replace an old Hayward H400ED2P which had rusted out burner tubes and blocked gas jets. The price point was close enough between the parts required for repair and the replacement unit so I opted to install the Low NOx unit. It heats up the spa a lot quicker than the old ED2, and definitely runs quieter than the old unit. Hopefully I will get a decent service life out of the unit with proper maintenance. It's predecessor was installed by the previous owner of my house and maintenance did not appear to be high on their agenda. Installation of the unit was fairly easy and wiring was a snap. I managed to remove the old unit and install the new on a Saturday morning.
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(4 out of 5 stars) Easy to Install and works much faster then my old heater
Reviewed By: jadjr from Nazareth, Pa. ()
Pros: Compact design, quick heat up
Cons: Hard to see thru glass to check/set flame height
This unit is very compact and easy to install. Unit was packaged well and arrived quickly out of stock.
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