Hayward W3H400FDP Universal H-Series 400,000 BTU propane pool heaterHayward Universal H-Series Propane Gas 400,000 BTU Low NOx Pool Heater, W3H400FDP$5,09900 Web Price
Hayward W3H400FDP Universal H-Series 400,000 BTU propane pool heater
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Hayward Universal H-Series Propane Gas 400,000 BTU Low NOx Pool Heater, W3H400FDP

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$5,09900 Web Price Some manufacturers don’t allow us to publicly display their best prices online. When you request an Unadvertised Deal, you’re asking us to unlock a special offer that isn’t shown on the site.
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Quick overview

  • 400,000 BTU the largest Universal H-Series size, for big pools and pool and spa combinations.
  • Propane gas the FDP model is factory set up for LP; order the natural gas model if your supply is NG.
  • Low NOx meets low nitrogen oxide emission requirements where they apply.
  • Induced draft a fan-assisted combustion system that is less sensitive to wind and venting conditions than a natural draft heater.
  • Installation adaptable the Universal H-Series is designed so the installer can adapt it to the site rather than the other way around.
  • Professional grade built for the service professional and meant to be installed by one.
Full description and specifications ↓

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Hayward TurboCell T-15 Salt Cell for Inground Pools up to 40,000 Gallons, W3T-CELL-15 Hayward Genuine OEM SP1082 Skimmer Basket, SPX1082CA Hayward Genuine OEM Vari-Flo XL Filter Valve Key Cover Handle Assembly, SPX0714BA Hayward H-Series Bezel & Keypad Assembly, FDXLBKP1930
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Product details

The Hayward Universal H-Series W3H400FDP is a 400,000 BTU propane gas pool heater with low NOx emissions and induced draft combustion. It is the top of the Universal H-Series range and the size most often chosen for large inground pools and for pool and spa systems where the spa needs to come up to temperature quickly.

Built for the installer

Hayward designs the Universal H-Series around the pool service professional: it is meant to be adaptable to the installation rather than dictating it, and it is efficient in operation once it is in. The induced draft system uses a fan to move combustion air, which makes the heater less sensitive to wind and venting conditions than a natural draft design.

Before you order

This is the propane model. If your site is plumbed for natural gas, order the natural gas version instead. Gas heaters must be installed by a qualified professional in accordance with local codes, and this unit ships by freight on a pallet.

Specifications
Brand Hayward
Manufacturer part number W3H400FDP
UPC 0610377387279
Series Universal H-Series
Heat input 400,000 BTU
Fuel Propane gas
Emissions Low NOx
Combustion Induced draft
Shipping weight 214 lb
Ships Freight

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Questions and answers

What people ask about this product, answered by our pool techs.

Is this the propane or natural gas model?
This is the propane model, W3H400FDP. Hayward makes the same heater for natural gas under a different part number, so check your fuel supply before ordering.
How big a pool will 400,000 BTU heat?
400,000 BTU is the largest size in the Universal H-Series and is the usual choice for large inground pools and for pool and spa combinations where fast spa heat-up matters. Your installer can size it against your gallons, target temperature and climate.
What does low NOx mean?
It means the burner is designed to produce less nitrogen oxide, which some air quality districts require. If your area does not require it, the heater still installs and runs the same way.
Does it ship by freight?
Yes. A 400,000 BTU gas heater is far too large for parcel carriers, so it ships on a pallet by freight and is delivered curbside.
Ask your own question