About Us Contact Us Shipping Order Tracking Need Installation? Easy Returns Privacy Terms of Service
Skip to content

Filters

Pool Heaters for 30,000 Gallon Pools and Up

Pool Heaters for 30,000 Gallon Swimming Pools and Larger

This collection covers pool heaters for inground pools above 30,000 gallons - a volume typical of larger residential pools, custom builds, and light commercial applications. It includes the AquaCal SQ200R, a 138,000 BTU inverter heat pump rated for pools up to 35,000 gallons and the most energy-efficient option in this collection, alongside eight Hayward H-series gas heaters in natural gas and propane versions spanning 150,000 to 400,000 BTUs. The AquaCal SQ200R requires a 220V dedicated circuit and no gas line. All Hayward gas models require a natural gas line or propane tank plus a 240V electrical connection.

Skip to products

What Size Pool Heater Do I Need for a 30,000 to 80,000 Gallon Swimming Pool?

Select your pool size or use case below to see the right models, BTU requirements, and estimated running costs.

My pool holds approximately...
Select your pool size above to see recommendations.
30,000-35,000 gal - recommended: 138,000-150,000 BTU

The AquaCal SQ200R is the only heat pump in this collection - it is the right choice for warm or moderate climates where the pool is used regularly and energy efficiency matters. The Hayward H150 gas models are significantly cheaper upfront and heat much faster, making them the better fit for occasional use, cold climates, or pools that sit unused for stretches.

35,000-45,000 gal - recommended: 150,000-200,000 BTU

For a pool in the 35,000 to 45,000 gallon range, the H200 is the correctly sized model. The H150 is included for pools on the lower end of this bracket where slightly undersizing is acceptable in exchange for a lower price and faster run cycles. Sizing up to the H200 gives faster heat-up and runs the unit at lower capacity, which reduces wear.

45,000-50,000 gal - recommended: 200,000-250,000 BTU

The H250 at 250,000 BTUs is the right size for pools approaching 50,000 gallons. For pools right at 45,000 gallons, the H200 is adequate, but the H250 at only $300 more heats faster and runs at lower output, reducing fuel consumption per degree of temperature rise.

Over 50,000 gal - recommended: 400,000 BTU

The Hayward H400 is the largest residential gas pool heater available and handles pools up to 80,000 gallons. At 400,000 BTUs it can raise a 50,000 gallon pool by roughly 8 degrees Fahrenheit per hour. It requires a 240V circuit and a high-capacity gas supply - a licensed contractor should verify your gas line can support the flow rate before installation.

Spa-capable heaters in this collection

All 9 models in this collection support spa mode to 104 F. The Hayward gas heaters are particularly well suited for spa use because they heat water quickly - a gas heater can bring a cold spa to temperature in under an hour, while the AquaCal SQ200R heat pump heats at 1 to 2 degrees F per hour and is better suited for maintaining spa temperature in a pool/spa combination kept warm together.

Monthly cost estimates for the AquaCal SQ200R assume a moderate climate swim season and average US electricity rate of $0.17/kWh. Gas heater running costs depend on local gas rates and usage frequency. Pool cover use reduces heat pump running costs by up to 40%. Call us at 800-809-3741 for personalised sizing advice.

Pool Heaters for Large Swimming Pools: Hayward H150, H200, H250, H400, and AquaCal SQ200R

Pool Size Unit BTUs Type / Mode Price
Up to 35,000 gal AquaCal SQ200R 138,000 Heat/Cool Inverter Spa $6,450
Hayward H150 Natural Gas 150,000 Gas Heat Only Spa $2,999
Hayward H150 Propane 150,000 Gas Heat Only Spa $2,999
Up to 45,000 gal Hayward H200 Natural Gas 200,000 Gas Heat Only Spa $3,699
Hayward H200 Propane 200,000 Gas Heat Only Spa $3,699
Up to 50,000 gal Hayward H250 Natural Gas 250,000 Gas Heat Only Spa $3,999
Hayward H250 Propane 250,000 Gas Heat Only Spa $3,999
Up to 80,000 gal Hayward H400 Natural Gas 400,000 Gas Heat Only Spa $5,099
Hayward H400 Propane 400,000 Gas Heat Only Spa $5,099

Gas heaters require a natural gas line or propane tank plus a 240V circuit. Heat/Cool units both heat and chill - the AquaCal SQ200R can cool the pool in summer. Inverter models vary output for lower running costs and quieter operation. Spa units are rated for spa use to 104 F. All models in this collection are for inground pools.

Frequently asked questions

How many BTUs do I need for a pool over 30,000 gallons?

For gas heaters, the general rule is 50,000 BTUs per 10,000 gallons as a minimum - so a 35,000 gallon pool needs at least 175,000 BTUs, making the H200 at 200,000 BTUs the correctly sized option. Sizing up is always better: a larger unit heats faster and runs at lower output, which reduces wear and fuel consumption per degree of heat. For heat pumps, pool size ratings are based on sustained maintenance heating rather than raw BTU output - the AquaCal SQ200R at 138,000 BTUs is rated to 35,000 gallons based on real-world tested performance rather than a simple BTU formula.

Should I choose natural gas or propane for a large pool heater?

The Hayward H-series heaters are available in both natural gas and propane versions at identical prices. If your property already has a natural gas supply line, natural gas is the more convenient and typically lower-cost fuel option. Propane is the practical choice for properties without a gas line - a 250-gallon or larger propane tank is typical for a pool heater in the 150,000 to 400,000 BTU range. At the H400 level, consumption is high enough that a 500-gallon tank and regular delivery schedule is worth planning for. A propane supplier can advise on tank sizing based on your expected usage.

Why is the AquaCal SQ200R the only heat pump in this collection?

Residential pool heat pumps have practical upper limits - as pool volume increases, the BTU output required for fast heat-up exceeds what electric heat pumps can economically deliver. The AquaCal SQ200R at 138,000 BTUs is one of the largest residential inverter heat pumps available and is rated to 35,000 gallons. For pools above that volume, gas heaters are the standard solution - they can produce 200,000 to 400,000 BTUs efficiently and economically in a way that heat pumps cannot match at scale. If you have a 35,000 gallon pool and want a heat pump for energy efficiency, the SQ200R is the right choice. For anything larger, the Hayward H-series is the practical path.

How long does a Hayward gas pool heater take to heat a large pool?

A gas heater raises pool water temperature at roughly 1 degree Fahrenheit per hour per 10,000 BTUs per 10,000 gallons of water. The Hayward H400 at 400,000 BTUs heating a 40,000 gallon pool from 65 to 80 degrees Fahrenheit would take approximately 15 hours. The H200 on the same pool would take around 30 hours. Sizing up gives significantly faster heat-up - a meaningful difference if you need the pool ready quickly after a cold period.

Can I use a gas pool heater with a saltwater pool?

Yes. All Hayward H-series heaters use a cupro-nickel heat exchanger which resists the corrosion that salt and chlorine can cause in standard copper exchangers. They are compatible with saltwater pools, chlorine pools, and bromine pools. Maintaining proper water chemistry - particularly pH between 7.4 and 7.6 and total alkalinity in the correct range - is important to protect the heat exchanger regardless of sanitizer type.

Do you offer installation?

Yes. Visit our installation support page for details on connecting with a licensed installer in your area. Gas pool heater installation requires a licensed contractor in most jurisdictions and must comply with local gas codes. A licensed plumber or pool professional handles the plumbing connections. The AquaCal SQ200R heat pump requires a 220V dedicated circuit and inline plumbing installation.

Trustpilot