Skip to content
  • 💸 Don't miss out on low-priced deals! 💸
  • 💸 Don't miss out on low-priced deals! 💸
IN THE SWIM ShopIN THE SWIM Shop
    • No products in the cart.

      Return to shop

  • Cart

    No products in the cart.

    Return to shop

  • Pool Heaters
    • Propane Pool Heaters
    • Solar Pool Heaters
    • Electric Pool Heat Pumps
  • Pool Filters
    • Pool Sand Filters
    • Multiport Valves
    • Pool Cartridge Filters
    • Above Ground Filters
    • Intex Filters
    • Inground Filters
  • Pool Pumps
    • Above Ground Pool Pumps
    • Variable Speed Pumps
    • Booster Pumps
  • Pool Lights
    • Inground Pool Lights
    • Above Ground Pool Lights
  • Solar Pool Covers
    • Rectangle Solar Covers
    • Round Solar Covers
    • Oval Solar Covers
  • Winter Pool Covers
    • Round Winter Covers
    • Rectangle Winter Covers
    • Oval Winter Covers
    • Winter Cover with Pool Closing Kit Bundles
  • Above Ground Pools
    • Round Above Ground Pool Packages
    • Oval Above Ground Pool Packages
 

Hayward – W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater

Home / Pool Heaters / Propane Pool Heaters
Sale!
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 2
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 3
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 4
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 5
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 6
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 7
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 8
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 9
Hayward - W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater - Image 10

$304.00 Original price was: $304.00.$96.99Current price is: $96.99.

Buy Now
SKU: AW50A 350034 Categories: Pool Heaters, Propane Pool Heaters
  • Effortless solutions, excellent customer care.
  • Your questions, our prompt answers.
  • We take quality seriously.
  • Protect Your Information, Shop with Safe Payments
Browse
  • Above Ground Pools
    • Oval Above Ground Pool Packages
    • Round Above Ground Pool Packages
  • Pool Filters
    • Above Ground Filters
    • Inground Filters
    • Intex Filters
    • Multiport Valves
    • Pool Cartridge Filters
    • Pool Sand Filters
  • Pool Heaters
    • Electric Pool Heat Pumps
    • Propane Pool Heaters
    • Solar Pool Heaters
  • Pool Lights
    • Above Ground Pool Lights
    • Inground Pool Lights
  • Pool Pumps
    • Above Ground Pool Pumps
    • Booster Pumps
    • Variable Speed Pumps
  • Solar Pool Covers
    • Oval Solar Covers
    • Rectangle Solar Covers
    • Round Solar Covers
  • Uncategorized
  • Winter Pool Covers
    • Oval Winter Covers
    • Rectangle Winter Covers
    • Round Winter Covers
    • Winter Cover with Pool Closing Kit Bundles
Recently Viewed
  • Polar Plus 12-Year 21' X 41' Oval Winter Pool Cover With Pool Closing Kit Up To 35,000 Gallons Bundle Polar Plus 12-Year 21' X 41' Oval Winter Pool Cover With Pool Closing Kit Up To 35,000 Gallons Bundle $206.98 Original price was: $206.98.$97.99Current price is: $97.99.
  • Description
  • Reviews (0)
Hayward W3H400FDP Universal H-Series, Low NOx, 400,000 BTU, Propane Gas, Pool and Spa Heater delivering durability, reliability, and energy efficiency.

  • “Totally Managed” Flow saving energy by reducing pump run time
  • Silicon Nitride Ignition System
  • Cupro-Nickel Heat Exchanger ensures compatibility with almost all pool systems including salt pools
  • Low NOx certification
  • 83-84% industry-leading thermal efficiency
  • Patented header by-pass design
  • Corrosion resistance
  • Digital LED display
  • High and low voltage options (110V or 220V)
  • 3/4″ Gas Connection at heater
  • Choice of left-side or right-side electric, gas and water connections (delivered right-side by default)
  • 2″ or 2-1/2″ plumbing connections
  • Important:

The Hayward Universal H-Series Propane Gas Pool and Spa Heater brings you quiet, efficient heating for your pool and spa. Hayward Propane Gas heaters are quiet, certified for low NOx emissions and eco-friendly making for a dependable, safe pool heater you can trust. Combining advanced technology with universal-fit flexibility, the Hayward H-Series is perfect for new or existing pool systems, delivering state-of-the-industry performance.

Hayward Universal H-Series Pool Heater Features

The Hayward Universal H-Series Propane Gas Pool and Spa Heater utilizes industry-leading hydraulic performance, reducing circulation pump run time while saving energy. The cupro-nickel heat exchanger provides exceptional corrosion resistance and erosion protection Ideal for today’s salt-based electronic chlorination systems. Silicon Nitride Ignition System and Insulated Fire Tile® Combustion Chamber allow for fast dependable lighting while securely trapping the heat, delivering the most performance for every BTU. The digital LED display maintains water temperature, monitoring the heater’s performance with self-diagnostic capability. The Hayward H-Series’ Finn Plate cupro-nickel heat exchanger has special V-groove design for faster heating and longer life. Hayward Universal H-Series, Low NOx, 400,000 BTU, Propane Gas, Pool and Spa Heater delivers energy efficient heating to your pool’s water that you can trust.

Hayward Universal H-Series – Versatility & Power

Using propane gas, the Hayward H-Series is reliable and boasts higher heating efficiencies. Being extremely versatile, Hayward Universal H-Series Heaters allow you to configure water, gas and electric connections on either the right or left side for unprecedented installation flexibility. Connecting your propane gas line is super easy to install with the Hayward H-Series built-in 3/4″ gas connection. With a lightweight, low-profile, compact design, the Hayward Propane Gas Pool and Spa Heater installs with virtually all new and existing equipment pads.

Common Questions

What are the dimensions of the unit?

  • Heater Dimensions: 36-1/2″ Width x 29-1/2″ Depth x 24″ Height
  • Weight: Approx. 210 lbs.

What Heat Exchanger type of the Hayward Universal H-Series Pool Heater?

  • Cupro-Nickel Heat Exchanger

Is this unit Low NOx?

  • Yes, this unit meets all state air quality regulations.

Plumbing Size?

  • This unit is plumbed 2″ and comes with 2″ unions for installation.


Product Type:
Pool Heater

Heat Exchanger:
Cupro-Nickel

Controls:
Digital

Ignition:
Electronic

Emission:
Low NOx

Fuel Type:
Propane Gas

Installation Type:
Residential

Pool Type:
Spa/Hot Tub

Eco-Friendly:
Yes

Energy Efficient:
Yes

Pool Type:
In Ground

Voltage:
110V / 220V

Heat Output:
400,000 BTU

Elevation:
0 – 2,000 ft

Manufacturer:
Hayward

Elevation:
2,000 – 7,700 ft

Product Weight:
210 lbs.

Warranty:
3-Year

Product Dimensions:
36.5″ Width x 29.5″ Length x 24″ Height

Reviews

There are no reviews yet.

Be the first to review “Hayward – W3H400FDP Universal H-Series, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater” Cancel reply

Related products

Sale!
Raypak - Millivolt Propane 200,000 BTU Pool Heater
Quick View

Pool Heaters

Raypak – Millivolt Propane 200,000 BTU Pool Heater

$336.00 Original price was: $336.00.$96.99Current price is: $96.99.
Sale!
G.A.M.E. - Bypass Kit For Multiple Solar Heaters
Quick View

Pool Heaters

G.A.M.E. – Bypass Kit For Multiple Solar Heaters

$59.99 Original price was: $59.99.$41.99Current price is: $41.99.
Sale!
Raypak - 009226 Digital Propane 333,000 BTU Pool Heater
Quick View

Pool Heaters

Raypak – 009226 Digital Propane 333,000 BTU Pool Heater

$303.00 Original price was: $303.00.$98.99Current price is: $98.99.
Sale!
Raypak - R5450ti-E Digital, Titanium, 103K BTU Electric Pool Heat Pump, 208/230V
Quick View

Electric Pool Heat Pumps

Raypak – R5450ti-E Digital, Titanium, 103K BTU Electric Pool Heat Pump, 208/230V

$313.00 Original price was: $313.00.$98.99Current price is: $98.99.
Sale!
Smartpool - SunHeater Roof/Rack Mounting Kit (one Per SunHeater Box)
Quick View

Pool Heaters

Smartpool – SunHeater Roof/Rack Mounting Kit (one Per SunHeater Box)

$54.99 Original price was: $54.99.$38.49Current price is: $38.49.
Sale!
Intex - 28685E Solar Mat 47" X 47" Above Ground Pool Solar Heater
Quick View

Pool Heaters

Intex – 28685E Solar Mat 47″ X 47″ Above Ground Pool Solar Heater

$36.99 Original price was: $36.99.$25.89Current price is: $25.89.
Sale!
Hayward - W3H200FDP Universal H-Series, Low NOx, 200K BTU, Propane Gas, Pool & Spa Heater
Quick View

Pool Heaters

Hayward – W3H200FDP Universal H-Series, Low NOx, 200K BTU, Propane Gas, Pool & Spa Heater

$328.00 Original price was: $328.00.$97.99Current price is: $97.99.
Sale!
Raypak - Digital Propane 200,000 BTU Pool Heater
Quick View

Pool Heaters

Raypak – Digital Propane 200,000 BTU Pool Heater

$390.00 Original price was: $390.00.$95.99Current price is: $95.99.
Products
  • Weekender II 18' Round 52" Tall Above Ground Pool Package Weekender II 18' Round 52" Tall Above Ground Pool Package $358.00 Original price was: $358.00.$98.99Current price is: $98.99.
  • Ambassador 27' X 52" Round Above Ground Pool Package Ambassador 27' X 52" Round Above Ground Pool Package $314.00 Original price was: $314.00.$97.99Current price is: $97.99.
LEGAL
  • Privacy Policy
  • Shipping & Returns
  • FAQ
  • Returns & Exchanges
  • Term and Conditions
CUSTOMER SERVICE
  • My account
  • Delivery
  • Payment Method
  • Contact Us
  • About Us
Signup for Newsletter

Sign up for exclusive offers, original stories, events and more.

[contact-form-7 id="15"]
Copyright 2025 © www.nicepoolsupplies.com
  • Pool Heaters
    • Propane Pool Heaters
    • Solar Pool Heaters
    • Electric Pool Heat Pumps
  • Pool Filters
    • Pool Sand Filters
    • Multiport Valves
    • Pool Cartridge Filters
    • Above Ground Filters
    • Intex Filters
    • Inground Filters
  • Pool Pumps
    • Above Ground Pool Pumps
    • Variable Speed Pumps
    • Booster Pumps
  • Pool Lights
    • Inground Pool Lights
    • Above Ground Pool Lights
  • Solar Pool Covers
    • Rectangle Solar Covers
    • Round Solar Covers
    • Oval Solar Covers
  • Winter Pool Covers
    • Round Winter Covers
    • Rectangle Winter Covers
    • Oval Winter Covers
    • Winter Cover with Pool Closing Kit Bundles
  • Above Ground Pools
    • Round Above Ground Pool Packages
    • Oval Above Ground Pool Packages
  • Login

Login

Lost your password?

Register

Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy.