Universal H-Series Low NOx Heater 350K BTU - LP - H350FDP


Part # H350FDP

By Hayward Pool Products

  4.75 Average  



Part # H350FDP

Warranty 1 Year

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

350,000 BTU
195 lbs.
33-1/4 in.
0-10,000 ft.
Heat Exchanger:
Cupro Nickel
Special Feature:
Low NOx Emissions

?     Asked on 6/18/2019 by Tony

Can this unit be plugged into a 110 wall socket?

A  Answered on 6/19/2019 by InyoPools Product Specialist Matt S.

The manufacturer prefers its heaters to be hardwired.

?     Asked on 6/11/2019 by

what size ventilation pipe is necessary if used inside a room

A  Answered on 6/11/2019 by InyoPools Product Specialist Lennox H.

Hi. You can use either P/N UHXNEGVT13501 (Negative Pressure) or UHXPOSHZ13501 (Positive Pressure).

?     Asked on 4/22/2019 by dave

could you please tell me what indoor stack I need for a H350fdp. thanks

A  Answered on 4/23/2019 by InyoPools Product Specialist Lennox H.

Hi, Dave. This H350FDP Heater vent kit p/n's are UHXNEGVT13501 (Negative Pressure) or UHXPOSHZ13501 (Positive Pressure). Use the Hayward H-series LoNox Installation Guide to determine which one you will need. 

?     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.

?     Asked on 4/21/2015 by Steve

How do I determine the size of heater needed for my commercial pool

A  Answered on 4/22/2015 by InyoPools Product Specialist Wes B.

Hi Steve, This should help you to decide. Size HeaterGallons in PoolSq. Ft. Surface Area of Pool100 - 200 BTU heaters1,000 gals to 10,000 galsup to 300 sq ft200 - 300 BTU heaters10,000 gals to 20,000 galsup to 500 sq ft300 - 400 BTU heaters20,000 gals to 40,000 galsup to 800 sq ft400 BTU heaters40,000 gals to 80,000 galsup to 1200 sq ft


Review Summary

 (Average 4.75  out of 5 stars)
4 Rating
5 star:
4 star:
3 star:
2 star:
1 star:

The Most Helpful Review

The Most Recent Reviews