By Hayward Pool Products



Part # W3H150FDP

Warranty 1 Year

Alternate Part #'s HAYW3H150FDP, HPPW3H150FDP

Product Description

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.


  • 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.
  • Our 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.
  • Easy-to-read L.E.D. digital Control Panel provides digital temperature readout and diagnostics for quick identification of components that might need service.
  • 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.
  • 1 Year limited warranty
  • Now with Cupro Nickel Heat Exchanger

Overall Dimensions

Product Specifications

150,000 BTU
0-10,000 ft.
Heat Exchanger:
Low NOx
Heater Type:

?     Asked on 4/21/2015by George

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?

A  Answered on 4/21/2015 by InyoPools Product Specialist Matt S.

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.

?     Asked on 6/18/2015by Hugo Parra

Hello, how do i determine the size of the heater i will need for my SPA?

A  Answered on 6/18/2015 by InyoPools Product Specialist Patrick P.

Hi Hugo, The main determining factors would be do you need Natural Gas or Propane? How many gallons is your spa? Are you replacing a heater? Or is this a new heater? If replacing a heater what size gas line do you currently have? How quickly would you like to raise the heater 30 degrees? Please email back with the answers to these questions and I can provide you with a heater recommendation.

?     Asked on 5/20/2016by Jim Farley

Can I use the Hayward 150 for an 18 ft round above ground pool?

A  Answered on 5/21/2016 by InyoPools Product Specialist Lennox H.

Hi Jim, This unit can be used to heat an 18ft above ground pool.

?     Asked on 5/20/2016by Inyo Visitor

If I purchase a propane heater now can it be converted to natural gas at a later date?

A  Answered on 5/21/2016 by InyoPools Product Specialist Patrick P.

Yes this heater can be converted to Natural gas by using the Hayward Conversion Kit (fdxlcnk0002) LP to Natural Gas.

?     Asked on 7/19/2016by linda

why is my heater reading LO AND ITS NOT RUNNING

A  Answered on 7/20/2016 by InyoPools Product Specialist Matt S.

According to Hayward, the "LO" error code is referring to a Limit String Open Error." Hayward's explanation for the error, taken from the owner's manual: If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes. Contact a licensed technician to inspect and repair your unit


Est. Repair Time

1 to 2 hrs

Tools Needed

Screwdriver, Pliers, Adjustable Wrench

3     0

old heater was 7 years old and just rusted out

Written on 12/26/2017 by Guest

I love this heater it works great and has a nice low tone to it when its running. The shipping was great, fast shipping and great driver that delivered it to my house. It was very easy to install. I have a small in ground pool in my house about 5000 gallons of water and it was able to raise the temperature 4 degrees an hour while it was 30 degree out side. I am very pleased with my new Hayward 150,000 BTU heater.

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