HAYWARD

Universal H-Series Propane 150K BTU Low NOx (Cupronickel)

$2,799.00

SKU: W3H150FDP

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Pool Heater Size Guide

Choosing the correct pool heater depends on pool size, desired heat-up time, climate, and heater type. Undersized heaters struggle to maintain temperature; oversized heaters heat faster with less runtime.

Heater Types Explained

Gas Pool Heaters (Natural Gas or Propane)

  • Fastest heat-up
  • Works in any climate
  • Higher operating cost

Best for: Quick heating, spas, occasional use


Electric Heat Pumps

  • Most energy-efficient
  • Slower heat-up
  • Performance depends on air temperature

Best for: Warm/moderate climates, consistent heating


Solar Pool Heaters

  • Lowest operating cost
  • Weather dependent
  • Slowest heat-up

Best for: Supplemental heating, sunny regions


BTU Requirements for Natural Gas and Propane
Based on Dimensions and Surface Area (sq. ft.)

Pool Dimensions Surface Area Minimum BTU
14′ x 28′ 392 130,700
15′ x 30′ 450 150,000
16′ x 32′ 512 170,700
18′ x 36′ 648 216,000
20′ x 40′ 800 266,700
24′ x 44′ 1,056 352,000

BTU Requirements for Heat Pumps
Based on Gallons

Pool Size (Gallons) Minimum BTU
Up to 15,000 90,000
15,000 – 25,000 110,000
25,000 – 35,000 130,000
35,000 – 50,000 150,000+

Hourly Temperature Increase
Based on Surface Area (sq. ft.) and BTU

Surface Area 250K BTU 350K BTU 400K BTU
300 2.0º 3.0º 3.5º
400 1.75º 2.5º 2.75º
500 1.5º 2.0º 2.5º
600 1.25º 1.5º 2.0º
700 1.0º 1.25º 1.5º
800 0.75º 1.0º 1.25º
1,000 0.5º 0.75º 1.0º

Gas Supply & Electrical Requirements (Very Important)

Gas Heaters

  • Must verify gas line size and meter capacity
  • Undersized gas supply = poor performance or ignition issues

Heat Pumps

  • Require dedicated breaker
  • Higher amperage draw
  • Longer electrical run considerations

⚠️ Heater sizing is meaningless if utilities are undersized.


Factors That Increase Heater Size Needs

You may need a larger heater if your pool has:

  • Attached spa
  • Waterfalls or spillovers
  • High wind exposure
  • Night swimming
  • Minimal sun exposure
  • Short heating windows (weekends only)

Common Heater Sizing Mistakes

❌ Choosing smallest BTU to save money
❌ Ignoring climate and wind
❌ Forgetting spa heating needs
❌ Not checking gas or electrical supply

✅ Size for how fast you want heat, not just pool volume


Replacing an Existing Heater?

Check the heater data plate for:

  • BTU input
  • Gas type (NG / LP)
  • Voltage & phase
  • Min/max flow rate

If upgrading, going one size larger almost always improves satisfaction.

If you’re unsure, contact us and we’ll help you choose the correct heater.

Hayward Universal H-Series gas heaters are the “universal” energy efficient remedy for any new or existing pool or spa. An industry-leading hydraulic design reduces circulation pump run time to provide energy savings of up to 18% when compared to less efficient competitors. The energy efficiency of the Universal H-Series gas heater combines with environmentally friendly low NOx emissions, a standard cupro nickel heat exchanger, and ultimate installation flexibility to responsibly heat a pool or spa today and for years to come.

Features and Benefits

  • Standard cupro nickel heat exchanger
  • Excellent salt water and chemical corrosion resistance
  • Exclusive “Totally Managed” cupro nickel heat exchanger water flow
  • Same water velocity through all tubes for faster heating
  • Patented header by-pass design
  • Reduction in pump run-time results in significant cost savings
  • 2″ x 2 1/2″ CPVC union plumbing connections
  • Forced draft system constantly moves air through the combustion chamber at a precise flow rate, eliminating the need for a high-wind stack
  • Low NOx emissions – meets clean air quality standards

NOTE: Hayward Universal H-Series heaters meet or exceed the South Coast Air Quality Management District (SCAQMD Rule 1146.2) Low NOx emissions standards in all Low NOx areas that apply the SCAQMD standard.

Additional information

Weight 110.00 lbs
Dimensions 22.50 × 30.00 × 23.00 in
Voltage

Energy Type

Input Rate

Thermal Efficiency

Port Size

Venting

Max Water Flow

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