Universal H-Series Low NOx Heater 500K BTU - LP - H500FDP


Part # H500FDP

By Hayward Pool Products



Part # H500FDP

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

500,000 BTU
0-10,000 ft.
Heat Exchanger:
Cupro Nickel
Special Feature:
Low NOx Emissions

?     Asked on 10/16/2017 by Patricia

I have this heater that I bought from Inyopool, what venting kit do I need. there is none offered for the 500 series. Thank you

A  Answered on 10/17/2017 by InyoPools Product Specialist Lennox H.

Hi, Patricia. The H500PD Heater vent kit p/n's are UHXNEGVT15001 (Negative Pressure) and UHXPOSHZ15002 (Positive Pressure). 

?     Asked on 7/6/2017 by jaco

Dear Sir I have a 120 000 liter elevated pool with no cover option and we require a gas heating unit. What size should we be looking for. Regards Jaco

A  Answered on 7/13/2017 by InyoPools Product Specialist Lennox H.

Hi, Jaco. Heaters are sized based on the surface area, but this unit is adequate to heat 120,000 liters of water. 

?     Asked on 10/7/2016 by HASAN

what is the minimum pressure (psi) required to operate H500FDN. What is the minimum pressure of water line in lpm?

A  Answered on 10/11/2016 by InyoPools Product Specialist Alan M.

The minimum flow rate for this heater is 40 GPM and max is 125 GPM. Here is a link to the H500FDN Installation Manual if you have additional questions.

?     Asked on 8/21/2016 by Bob

I'm running a Hayward sf 1593 matrix pump I believe the Gpm is about 90, on an 1 1/2 pipe, I was wondering if this unit at 500 k btu would work better on a 28 ft x 4 ft round above ground pool vs purchasing a 150k btu heater built for an above ground pool, what difference does it make above or below if the intent is to hear the water?

A  Answered on 8/23/2016 by InyoPools Product Specialist Scott W.

It will depend on how fast you want to heat your pool. The more BTU's the faster the heater will heat your pool.

?     Asked on 4/21/2015 by 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.