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Hayward Universal 300,000 BTU H Series Low NOx Propane Swimming Pool Heater

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Availability: In Stock


Combining advanced technology with universal-fit flexibility, the Hayward Universal H-Series heater is a smart choice for virtually any new installation or existing system upgrade. Delivering a state-of-the-industry performance, outstanding energy efficiency, extremely low NOx emission levels and legendary durability and reliability. A choice of left-side or right-side electric, gas and water connections gives the Universal H-Series heaters unprecedented installation flexibility. This enhanced adaptability – coupled with lightweight design, modern low-profile appearance and only front-panel access required for installation and service – ensures compatibility with virtually all new or existing systems and equipment pad conditions.

Key Features:

  • STANDARD Cupro-Nickel Heater Exchanger – Totally managed flow provides exceptional corrosion resistance and erosion protection. Ideal for today’s salt-based electronic chlorination systems

  • Superior Hydraulic Performance – Industry-leading hydraulic performance saves energy by reducing circulation pump run time

  • State-of-the-Art Finn Plate Heat Exchanger – With special V-groove design for faster heating and longer life

  • Insulated Fire Tile Combustion Chamber – Unlike older forms of insulation, Fire Tile securely traps the heat, delivering the most performance from each BTU

  • Hot-Surface Silicon Nitride Ignition System – Exclusive silicon nitride ignition system for dependable lighting and reliable operation

  • Dual Voltage – Installation is simplified with voltage that adapts to either 110V or 220V

  • Universal Wiring Junction Boxes – High and low voltage connections are easy and convenient with left and right side junction boxes

  • Digital LED Control Panel / Electronic Control – Display maintains water temperature; monitors heater performance with self-diagnostic capability

  • Low NOx Emissions – Environmentally responsible


Hayward is always looking for ways to make pool and spa ownership as affordable and effortless as possible. Our Universal H-Series pool and spa heaters combine advanced technology with universal-fit flexibility, making them a smart choice for virtually any new installation or system upgrade. They deliver state-of-the-industry performance, save up to 18% on energy costs, have extremely low NOx emission levels and a legendary reputation for durability. They’re offered in 150,000, 200,000, 250,000, 300,000, 350,000 and 400,000 BTU/hr. models.


Built with a durable Cupro nickel heat exchanger, Universal H-Series heaters offer exceptional protection against corrosion and premature failure caused by unbalanced water chemistry, ensuring you get season after season of premium heating performance


Universal H-Series heaters boast industry-leading hydraulic performance coupled with lightning-fast speed-to-heat capability. In fact, the powerful 500,000 BTU model is the fastest in its class, giving you less time to wait and more time in the water


Designed with “totally managed” water flow, Universal H-Series heaters save energy (and money) by reducing pump run time. Their low NOx emissions meet air quality standards in all low-NOx areas, so you can rest easy knowing their environmental impact is low


Depth29 ½”
Water Connections2” x 2 ½”
Heat ExchangerCupro Nickel
Indoor Vent Pipe Diameter8”
Heater Weight145 lbs
Gas Connection at Heater¾”
Warranty1 Year on Parts/Labor

Hayward Universal 300,000 BTU H Series Low NOx Propane Swimming Pool Heater Reviews

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