Part # H400FDN
Warranty 1 Year
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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
I'm looking at the Hayward N G Heaters. The 400,000 BTU and the 500,000 BTU The 400,000 has a shield over the control panel.Does the 500,000 also have this shield? Thank You
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Hi, Pete. All of the Universal H-Series Low NOx Heaters will include a Keypad Cover Kit - FDXLKPC1930.
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I have a pentair 400,000 btu heater now however the water lines come in from the left side of the heater. Can this heater be retro fit so i don't have to re route
existing plumbing?
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Yes, this unit will allow you to rotate the unit. There will be a How To: Rotate UHS Heat Exchanger in the manual.
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I currently have a pentair heater that is at least 20+ years old that I am replacing. (1) will this heater work with my Easy Touch Automation Remote? (2) there is a 3/4 inch gas line running about 85 feet from my meter to the current heater. Will that work with this?
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Hi, Bill. This heater will work with an EasyTouch Automation Remote 2-Wire. The gas connection at the heater is 3/4", this unit will only work with 3/4" gas line if you have a High-Pressure, 2-Stage application.
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I'm opening the pool and starting up the Hayward heater, there is a crossover pipe between the inlet and outlet on the heater, is the crossover pipe in the open or closed position during normal operating function? I have it in the closed position but the heater keeps turning on and off. What is wrong? Thanks
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Hi, Jack. The valve should be in the opening position. The water flow might be too much for the unit.
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What size pool is this heater good for???
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Hi, Ronnie. This heater can be used to heat a pool/spa that is 10K-40K gallons. If your pool is larger you might need another unit depending on how fast you want the water heated.
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WE HAVE A jANDY HEATER AT THIS TIME BUT THE CONTROL PANEL HAS GONE BAD DUE TO BEING ON THE WEST SIDE OF THE HOUSE AND BEING EXPOSED TO A GREAT DEAL OF SUNLIGHT. I NOTICED THE CONTROL
PANEL ON THE 400btu GAS HEATER HAS THE CONTROL PANEL ON THE FRONT AS WELL. if PURCHASED WHAT CAN WE DO TO REDUCE THE ULTRIVIOLET SUN FROM DAMAGING THE CONTROL PANEL.
tHANK YOU CURT
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The Universal H-Series Low NOx Heaters are equipped with Keypad Bezel Cover to protect the keypad.
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I have a 15 year old Teledyne Laars 400000 BTU heater supplied by three-quarter inch natural gas line. Is the 3/4 inch gas line existing going to be enough to supply this heater they are both 400000 btus. Thx. Mike
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Hi, Mike. A 3/4 gas line is sufficient for specific applications, refer to page 22-24 of the Hayward H-series LoNox Installation Guide.
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Can turn this pool heater on and off whenever I want? or once I turn it on for the season (say April), I have to keep it on running 24/7 until I winterize it in September? Is there a "On/Off" button? I live in PA, 45'X25' pool
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Hi, Patrick S. You can put the unit in STANDBY mode which will turn the Heater off.
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What is the best way to determine the BTU size of heater required for my pool? I currently have a 406,000 BTU unit and my pool is 27,000 gallons.
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Hi, Steve. Our Sizing A Pool Heater Blog has all the steps you'll need.
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I ordered this heater,
Is there a service installed?
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Good afternoon, for a list of installers you will need to review Hayward's Dealer locator. All you need to do is Enter a postal code to find the nearest Hayward authorized pool professional.
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What size propane line is required?
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Hi, Jeff. The Hayward H-series LoNox Installation Guide provides the gas line info on page 22 under Gas Supply and Piping.
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how do i properly winterize my hayward h 250 ? as far as i can see they tell you to open the drain on the header. this doesn't seem to be enough.
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Hi, Bill. Draining all of the water from the unit is all it takes to winterize the unit. You can take it an extra step and get a heater cover to protect the unit from the cold.
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I have an existing 1-1/4" gas line run at around 140'. Will that be sufficient for this heater?
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Hi Matt, According to the Hayward H-series LoNox Installation Guide you will need 1-1/2" pipe.
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Can this heater be installed outside and used in all weather conditions?
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Hi Rich, This unit can be installed outside and can be used in all weather conditions. Please refer to the Hayward Universal H-Series Owner's Manual for winterizing instructions.
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do all the heaters have a right side connection or do you have to order it that way?
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Normally heaters are factory set to the rights side for connection. The H400FDN is factory set to the right, it may be reversed by a Certified Pool Technician before installation.
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is there any specific winterizing instructions the manual does not have any.
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Hi Tammy, You can find the Winterizing Instructions in the Hayward H-series LoNox Installation Guide.
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When wiring this heater is it 110 or 220?
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Hi Jack, This heater can be wired either 110V or 220V, it comes set up for 220V but can be easily converted to 120V by removing the 220V jumper.
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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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I would like to replace an older Model H400 IDL serial n°30831409 dated 2002 with this Low Nox 400K NG. Is this the right choice? Will the new unit be compatible with the existing external electronic panel control?
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Yes the H400FDN would be the correct replacement for the H400IDL heater. Yes this heater would be compatible with any external controller you were using on the H400IDL.
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Heater model # H400FDN, can be used on pools of all different sizes? The larger the BTU's the quicker the pool will get warm
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The required size of a heater depends on the size of your pool or spa and how fast you want to heat up your pool. In the northern states you will probably want the larger heaters to compensate for the colder temperatures. Above ground pools use heaters from 55K to 130K BTUs. In ground pools and spa general run from 100K to 400K BTU. For an average 15' x 30' pool (15,000 gallons), a 300K BTU heater would raise your pool temperature 2 degrees per hour; a 400K BTU heater, 2.7 degrees per hour. For a 20' x 30' pool (20,000 gallons) the temperature rise for 300K and 400K heaters would be 1.5 and 2 degrees respectively. By contrast these same heaters would raise the temperature of an average size spa 30 degrees in 35 and 20 minutes respectively.
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Where can my heater be installed?
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There are specific venting requirements and clearance distances that must be met to ensure proper operation. Consult the owner’s manual for exact specifications for your model of heater.NOTE: Gas fired heaters should be diagnosed and repaired by trained personnel.
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Is it possible to convert this heater from natural gas to propane?
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Yes, it is possible to convert this heater from natural to propane gas as there is a conversion kit for it. To view and purchase this kit you you will need to click here.
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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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Is a vent required for typical outside installation for the Hayward 150k Ng Lo Nox heater?
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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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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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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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How do you know if a pool heater is a propane heater or a natural gas heater?
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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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2 to 4 hrs
Screwdriver, Pliers, Wrench Set, Adjustable Wrench, Multimeter
Asked INYOPOOLS.COM forum which heaters were recommended. Got a reply almost immediately and proceeded to look through internet for best price on that brand/model. INYOPOOLS.COM not only had an extremely competive price but also provided the knowledge on which product would work best for my needs and info on how to install it.
Got heater from delivery service - they placed right in front of garage. Heater was heavy but not too much for two adults to move into place. Old heater was already removed from exisiting pad. Connected gas line with minimal adjustments to old setup. Replumed pool PVC lines as it was slightly different setup than old Jandy heater. Tested elecrircal volts to confirm it was 240v. Connected electric and tested heater - it kicked right on after about 30 seconds.
Was in hot tub that night enjoying!
Less than 1 hr
Screwdriver, Adjustable Wrench
I had this heater installed by a plumber and electrician in about 30 minutes! It is so quiet that the only noise is from the flames on the burner, and it heats my pool water at about 2 - 3 degrees per hour. Plus, because I live in the Northeast I have to winterize my filter, etc. This heater is very easy to winterize as the instructions are precise and very easy to follow. A perfect pool heater!
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
(5 out of 5 stars) Hot tub back in action!
Reviewed By: ()
What a great product - easy to install, quality build and works great!
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1 0
(5 out of 5 stars)
Reviewed By: ()
Heater arrived within 3 days of ordering it online...perfect condition. Installation took all of 30 minutes by plumber and electrician. Runs extremely quietly...very efficient, and heats my water 2 - 3 degrees per hour. Perfect! A must buy!
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(5 out of 5 stars)
Reviewed By: ()
Heater is fantastic came to my door 3 days after order was packaged extremely well so no damage looks n runs great was up n running few days after receiving it lol had to wait for electrician pool was at 79 degrees turned heater on and had it up to 88 degrees in 4 hours for a pool 18x38 inground absolutely thrilled and price was 1000$ less than my pool company and a few hundred less than other website with free shipping so was a no brained there ty inyopools
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1 0
(5 out of 5 stars)
Reviewed By: Samuel I. from New York ()
Pros: works good
Cons: very big unit
its a real big unit. i was amazed to wee how big it was. works good
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(5 out of 5 stars) hayward 400k heater
Reviewed By: John R. from merrick, NY ()
Pros: works great, and great price at inyo
Cons: none
compact, powerfull, e z to install (replaced my EXPENSIVE heat pump with it, and what a wasye of money that thing was)
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(5 out of 5 stars) great pool heater
Reviewed By: John R. from merrick, NY ()
Pros: price of unit, very good warm up rate, considering my pool is 50,000 gallons
Cons: NONE
great heater, fantastic price..inyo beat evry one by at least $200 or more, came in 4 days delivery was a breeze, looks good e z to install (put it in in place of my heat pump, WHICH WAS A WASTE OF TIME AND MONEY, REALLY BIG WASTE)
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2 0
(4 out of 5 stars) Great Heater! Terrible Delivery Method
Reviewed By: Jarrod S. from Lewisville, TX ()
Pros: Temperature settings
Cons: Delivery
The heater was easy to install and operate. I love the digital thermostat because you can not only set it at a specific desired temperature but you can also see the current temperature. I gave it 4 stars because of the Delivery, It came on a 50ft trailer so I actually had to meet the driver in a parking lot outside my neighborhood. It was a good thing I had a truck or this would not of been possible. I was also charged an additional $10.00 for a lift gate fee which was pointless since we slid it off into my truck. With that being said the Heater looks good and performs even better. The delivery was a joke.
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