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Home Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater | 250,000 BTU | Natural Gas | W3H250FDN
NOTICE: The pool & spa industry continues to face industry-wide shortages on many products that most vendors expect to last late into 2022. We're allowing items to be purchased so that customers who choose to wait will have their order shipped when product is available. Most vendors are not providing any ETA on when items will be available. WE WILL EMAIL YOU RIGHT AWAY IF YOUR ITEM IS BACKORDERED. 

Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater | 250,000 BTU | Natural Gas | W3H250FDN

Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater | 250,000 BTU | Natural Gas | W3H250FDN
Sale $2,999.00

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Parts AvailableParts Available
Platinum Preferred Manufacturer
  • Part of the Hayward Energy Solutions family of products
  • Digital LED Control Panel
    Electronic control/display maintains water temperature; monitors heater performance with self-diagnostic capability

  • Cupro Nickel Heat Exchanger
    Totally Managed Flow provides exceptional corrosion resistance and erosion protection. Ideal for today’s salt-based electronic chlorination systems

  • Online part number W3H250FDN is the direct replacement for part number H250FDN.
  • Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater | 150,000 BTU | Propane | W3H150FDP
    Universal H-Series Low NOx Induced Draft Heater - Propane - 150k BTU - W3H150FDP

  • Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater | 200,000 BTU | Propane | W3H200FDP
    Universal H-Series Low NOx Induced Draft Heater - Propane - 200k BTU - W3H200FDP

  • Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater | 400,000 BTU | Propane | W3H400FDP
    Universal H-Series Low NOx Induced Draft Heater - Propane - 400k BTU - W3H400FDP

    Sale $3,799.00
  • Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater | 250,000 BTU | Propane | W3H250FDP
    Universal H-Series Low NOx Induced Draft Heater - Propane - 250k BTU - W3H250FDP

    Sale $2,999.00
  • Hayward Negative Pressure Vertical Indoor Vent Adapter Kit for H250 Universal Heaters | 6" Diameter | UHXNEGVT12506
    Hayward Negative Pressure Vertical Indoor Vent Adapter Kit for H250 Universal Heaters | 6" Diameter | UHXNEGVT12506


Hayward Universal H-Series Low NOx Induced Draft Pool & Spa Heater

The Hayward Universal H-Series gas heater is the "universal" energy efficient remedy for any new or existing pool or spa. An industry leading hydraulic design reduces circulation pump run time to provide energy savings of up to 18% when compared to less efficient competitors. The energy efficiency of the Universal H-Series gas heater combines with environmentally friendly low NOx emissions, a standard cupro nickel heat exchanger and ultimate installation flexibility on new or existing equipment pads to responsibly heat a pool or spa today and for years to come.
The forced draft system in the Universal H-Series constantly moves air through the combustion chamber at a precise flow rate eliminating outside weather variables that can affect heating performance. Wind conditions are eliminated and there is no need to install a high-wind stack.
Presenting Hayward's world-class heater with an Earth-friendly conscience the Universal H-Series heater! The Universal H-Series Low NOx heater has an 84 percent industry-leading thermal efficiency and complies with all current California air quality emission standards. The low NOx emission makes it a perfect choice for the environmentally concerned pool owner.
Enjoy a warmer pool this season without your fuel costs skyrocketing. Hayward's Universal H-Series heaters represent innovative heating technology for pools and spas. Its hydraulic performance also saves energy by reducing the circulation time of the pump. It can raise the temperature of an 800 gallon pool 30 degrees in less than an hour you'll feel the benefits the moment you step into the water. This approach to heating your pool is an efficient use of energy showing once again the commitment to developing earth-friendly products.
Other performance and efficiency-enhancing advances include stainless steel burners, corrosion-resistant Finn Plate heat exchangers with Cupro nickel, and insulated Fire Tile combustion chambers. This traps the heat unlike other forms of insulation delivering the highest degree of performance from every BTU. Equipped with an LED control panel it monitors heater performance for added convenience and maximum comfort with minimum effort. The ignition system delivers dependable lighting and reliable operations with just a touch of a button. The forced draft system constantly moves air through the combustion chamber to eliminate all outside weather variables affecting heating performance, such as wind conditions, eliminating the need to install a high-wind stack.
Additionally, the Universal H-Series heater is easy to install and combines advanced technology with universal-fit flexibility making it virtually compatible with any new or existing equipment pad. This heating mixture sustains your swimming season, adds to your comfort, is energy efficient, and reduces your fuel costs. This low NOx emissions heater is perfect for you and the environment all at the same time.
NOTE: 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.
Superior Hydraulic Performance - New polymer header provides superior hydraulic performance to save energy and protect against the damaging effects of erosion from high flow conditions for improved reliability.
Designed for today's larger diameter plumbing systems with 2" x 2 1/2" CPVC unions.
Forced Draft System - Forced draft system constantly moves air through the combustion chamber at a precise flow rate, eliminating all outside weather variables that can effect the heating performance, such as high wind conditions without a high wind stack.
State-of-the-Art Finn Plate Heat Exchanger with Cupro Nickel - The patented single header "V" baffle design heat exchangers allow for long life, fast heating and virtually no condensation. All Hayward heat exchangers are now constructed with highly resilient Cupro Nickel for greater durability and longevity even in salt-based, high flow or aggressive water chemistry set ups.
L.E.D. Control Panel - Easy-to-read L.E.D. Control Panel provides digital temperature readout and diagnostics for quick identification of components that might need service.
Product Specifications:
Brand Hayward
Item Low NOx Pool Heater
Series Universal H-Series
Gas Type Natural
Headers Polymer
Control Type Digital Electric, Dual Thermostat
Tubing Material Cupro Nickel
BTUH Input 250,000
Cabinet Width 28 Inch
Cabinet Depth 29-1/2 Inch
Cabinet Height 24 Inch
Flue Diameter 4 Inch
Gas Connection 3/4 Inch
Water Connection 2 Inch x 2-1/2 Inch Unions
Voltage Rating 110/220 V
Frequency Rating 60 Hz
Phase 1-Phase

BTU Rating
Gas Type
Natural Gas
Q & A
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 16 questions Browse 16 questions and 14 answers
Will it interchange without changing anything with an older h250 unit?
Rick C on Apr 24, 2017
how do is size my pool heater ?
A shopper on Apr 18, 2016
BEST ANSWER: My pool size holds 44000 gal does good job
can this heater be used with 11/2" plumbing?
A shopper on Jun 9, 2017
BEST ANSWER: wil the heater work with 1/12 inch piping?
how to replace limit switch ?
A shopper on Oct 12, 2018
Does the heater come with an automatic timer for scheduled on and off?
John W on Apr 30, 2020
BEST ANSWER: No. You set the temp you want to maintain and it will cycle on an off when the temp is reached.
What is "Heat Exchanger" and what is "Heater"?
MIKE S on Jun 3, 2020
BEST ANSWER: The easy way to think of a heat exchanger is: if you had a length of copper tubing connected to a water hose, turned the water on; the tubing would be at a constant temperature of the water. If you apply heat to the outside of the copper tubing the water inside would absorb the heat and warm up.

The heater represents the source of heat being applied to the exchanger. It could be gas burner or electric heating elements as in an electric hot water heater.

If you have a gas hot water heater in your home you have a heat exchanger.

Pool/Spa heater like the one I have uses a gas fired burner to apply heat to the exchanger. The exchanger has a lot of tubs for the water to pass through, providing a lot of surface area for the heat to be applied too.
Hope this helps.
My pool holds 26 ,000 gallons water in ground pool ?
Frank F on May 22, 2020
BEST ANSWER: We have the same size pool and the heater has been wonderful. Works great for the past 2 years. :)
If my old heater is 150 btu if I buy a 250 btu will it heat the water faster?
Luetta R on Apr 10, 2018
BEST ANSWER: Yes it will heat water faster.
can this unit has a direct vent?
Joseph P on Aug 22, 2017
BEST ANSWER: Yes, you would be able to purchase the vent adapters that are listed in the suggested purchases and that would be replacing the vent cover. Thank you.
What is the size of Hayward H250 natural gas pool heater?
A shopper on Jul 3, 2017
BEST ANSWER: 24" Wide, 30" Deep, 24" High
is this complete for outdoor?
A shopper on May 26, 2017
BEST ANSWER: yes, just needs to be piped to gas supply and set on brick or concrete base
stainless steel burner assembly?
Nancy B on Nov 28, 2016
BEST ANSWER: The burners are stainless and the exchanger is cupro-nickel
Does it have a stainless steel burner assembly?
A shopper on Nov 28, 2016
How to turn off the heater for winter?
A shopper on Oct 9, 2015
BEST ANSWER: Turn off gas drain and leave drain valves out cover good if outside
must heater be hard wired.?
A shopper on Apr 30, 2021
Will this be the correct size heater for a 29,000 gallon pool?
A shopper on May 27, 2020
4.9 / 5.0
7 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
My Purchase
I recommend Pool Supply for great deals and service. Purchased my heater and it arrived in 5 days. Heater was freighted to my front door and inside delivery to my back yard. Quality service all the way.
July 12, 2017
over 4 years ago
Rated 5 out of 5
Great Heater
I decided to purchase a new Hayward pool heater when my 23 year old Hayward developed reliability issues.
The new heater was easy to install and much more efficient. The water volume thru the heater and out the jets is much greater then with the old heater. This heats the pool quicker, about one degree an hour.
Very glad I finally upgraded to a new heater.
September 4, 2016
over 5 years ago
Rated 5 out of 5
Great unit!
This heater was super easy to install and is even easier to use. Couldn't believe the price - PSU has a better price than Amazon!
January 10, 2013
Rated 4 out of 5
So far, so good!
Another great product from Hayward... the heater works as expected and installed the heater without any problems, I have a 18,000 gallon pool, heats up around 1 degree each hour, so far, so good!
April 12, 2015
Rated 5 out of 5
Hayward pool heater—the way to go!
The Hayward pool heater is great. I ignited the heater (easily) and it cooled our pool to the desired temperature in minutes. The installer had only great praise for the quality and durability of the heater. It’s not the least expensive, but it seems to be the highest quality.
May 6, 2020
over 2 years ago
Rated 5 out of 5
just got it, fast shipping. maybe three at most..
i have not connected yet, maybe next year. the water is 84% f
June 11, 2021
11 months ago
Rated 5 out of 5
This is our 2nd furnace purchase ......we like this brand that much! We bought this one early so we are waiting till May to hook it up. Hopefully,,,,,,it works just fine!
March 2, 2021
1 year ago
Warranty applies only to products that were purchased from Hayward authorized sellers. Pool Supply Unlimited is a Hayward Authorized Online Reseller.
See Warranty Information PDF for warranty details.
For Hayward warranty registration information, and to submit online, please visit www.hayward-pool.com
This information was updated on 4/22/2022. For the most current information and full warranty policy please visit www.hayward-pool.com

 Adobe Acrobat PDF Warranty Information
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Pool Supply Unlimited is an e-commerce company that loves water. We love to pump it, filter it, heat it, chlorinate it, light it up and stare at it while we're barbequing a fat, juicy steak. There are real pool professionals working here. Our guys have seen thousands of pools in their careers, no exaggeration. We are based in Southern California and can land most products to your door (within the 48 contiguous states) in less than a week.
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