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 of right side electric, water and gas connections plus 20" x 2.5" CPVC union connections to to provide the ultimate installation flexibility for new or existing equipment pads. 

NEW Forced Draft System 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. 

State-of-the-Art Finn Plate Heat Exchanger with Cupro Nickel
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 environments.


Pool Sizes Recommended Gas Heater Size Heat Pump Size
15 Feet Round 100,000 - 150,000 BTU 50,000 - 70,000 BTU
18 Feet Round 100,000 - 150,000 BTU 50,000 - 70,000 BTU
21 Feet Round 100,000 - 150,000 BTU 50,000 - 85,000 BTU
24 Feet Round 100,000 - 150,000 BTU 50,000 - 112,000 BTU
27 Feet Round 175,000 - 250,000 BTU 110,000 - 120,000 BTU
12 Feet by 24 Feet 100,000 - 150,000 BTU 70,000 - 85,000 BTU
14 Feet by 28 Feet 150,000 - 200,000 BTU 70,000 - 85,000 BTU
16 Feet by 32 Feet 200,000 - 250,000 BTU 110,000 - 117,000 BTU
18 Feet by 36 Feet 250,000 - 300,000 BTU 110,000 - 117,000 BTU
20 Feet by 40 Feet 300,000 - 400,000 BTU 137,000 - 141,000 BTU

Gas heaters boast the ability to produce heat quickly which makes it a popular choice amongst pool owners. 

Gas heater units are designed for both above ground pools and in-ground pools. Gas pool heaters also come in Electronic or Millivolt (Standing Pilot) versions. Electronic versions are like a modern gas boiler and feature electronic spark ignition and micro processor control, thus giving you complete control of your pool temperature at the push of a button. Millivolt models are a traditional technology which uses a permanent pilot light and therefore is slightly less efficient, however does not require electrical service. 

So whether it is an in-ground pool heater your require or an above ground pool heater, we are ready and stocked waiting for you!

Hayward Universal H Series Low NOx 350,000 BTU Natural Gas Swimming Pool Heater