Universal H-Series Heater 400,000 BTU - Propane Gas, Low NOx
Hayward
SKU: H400FDP
Hayward Universal H-Series gas heaters are the"universal" energy efficient remedy for any new or existing pool or spa.
Replacement SKU: HS400FDP
Features
Hayward Universal H-Series gas heaters are 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 to responsibly heat a pool or spa today and for years to come.
Features and Benefits
- Standard cupro nickel heat exchanger
- Excellent salt water and chemical corrosion resistance
- Exclusive"Totally Managed" cupro nickel heat exchanger water flow
- Same water velocity through all tubes for faster heating
- Patented header by-pass design
- Reduction in pump run-time results in significant cost savings
- 2" x 2 1/2" CPVC union plumbing connections
- Forced draft system constantly moves air through the combustion chamber at a precise flow rate, eliminating the need for a high-wind stack
- Low NOx emissions - meets clean air quality standards
NOTE: Hayward Universal H-Series heaters meet or exceed the South Coast Air Quality Management District (SCAQMD Rule 1146.2) Low NOx emissions standards in all Low NOx areas that apply the SCAQMD standard.

- EXPERT LINE products can only be purchased through your local pool professional or in-store. Â Exclusions, other terms, and conditions may apply.
- 3+ Year Parts and Labor Warranties*
*When sold by a Hayward Rewards® partner. Exclusions, other terms and conditions may apply.
| Active Defrost | No |
|---|---|
| Application | New Construction, Renovation, Aftermarket |
| Boost Mode | No |
| Brand | Hayward |
| Channel | Expert Line |
| Circuit Amps | 5.5 |
| Compressor Speed | N/A |
| Cooling Capability | No |
| Fuel Type | Propane (LP) |
| GTIN | 610377027267 |
| Heating Capacity (BTU/hr) | 400,000 |
| Hertz - Heaters | 60 Hz |
| Kilowatts | 117 kW |
| Warranty - Labor | 1-year |
| Low Ambient Operation | Yes |
| Master Carton Qty | 1 |
| Maximum Breaker Size (Amps) | 15 |
| Minimum Operating Temperature | 40 °F |
| Pallet Qty | 1 |
| Warranty - Parts | 3-year |
| Phase - Heaters | 1 |
| Pool Type | In Ground |
| Product Dimensions | 24 " x 34 " x 29.5 " |
| Product Height | 24 in |
| Product Length | 29.5 in |
| Product Weight | 195 lb |
| Product Width | 34 in |
| Rear Clearance - Heaters | 6" |
| Refrigerant | Yes |
| Series Heaters | Universal H-Series Low NOx |
| Shipping Dimensions | 30 " x 32.5 " x 39.5 " |
| Shipping Weight | 213.5 lb |
| Side Clearance - Heaters | 12" |
| Silent Mode | No |
| Sub Brand | N/A |
| Voltage - Heaters | 120/240V |
| Water Flow Rate Max | 125 |
| Water Flow Rate Min | 30 |
Manuals
Questions & Answers
15 answered question(s)
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Q: Why did the end of my heat exchanger tubes rot off y the o rings after two years use
By Hayward Support
Q: What is the warranty on the H-400 for propane and a dealer close to Fort Oglethorpe, Ga please
By Hayward Support
Q: Hi, I have a Hayward Pool heater and need to replace 3 gaskets. 2x3" round and 1 oval. The warranty says it's model W3H150FD/ W3H200FD/ W3H250FD/ WEH400FD. On the warranty it also has the Model number ( 5130004201C) but I need to know which of the above it is: 150/200/250/400. I have found someone who can get the parts( unless you can) but they said that you would be able to tell which from the Model number that I have given you. I have pictures but I'm not with the pool heater at this time. I hope you can help. Thanks, Susi
By Hayward Support
Q: I'm buying a new Hayward 400 heater since the prior one lasted 15 years. Question: Are the input / output ports the same distance from each other compared to the 2010 units? I'm hoping my plumbing pipes fit.
By Hayward Support
Q: What part # do I need For Model H400fdp Heat exchnger
By Hayward Support
Q: I’m looking to have this heater for my above ground pool. I see it’s recommended for in ground pools. Why will it not work for an above ground pool. We wanted a bigger heater then the one we had which was a 250k a friend has this heater for their above ground pool and loves it. Faster heating of water and better.
By Hayward Support
Q: What is the ventilation area needed for the 400,000 BTU gas heater?
By Hayward Support
Q: Looking for a propane heater for above ground pool. Will this one work?
By Hayward Support
Q: Is the h400 item number 50033 the one with brass fittings?
By Hayward Support
Q: do you have a check list for maintenance
By Hayward Support
Q: What is the warranty on a Hayward natural gas heater
By Hayward Support
Q: How much propane does the SKU: H400FDP burn per hour?
By Hayward Support
Q: Can the W3H400FDP heater run on 50Hz?
By Hayward Support
Q: What is the average pool size (gallons) recommended for this heater?
By Hayward Support
Q: Any distributor in United Arab Emirates??
By Hayward Support


