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Gas vs Heat Pump Pool Heater Cost Calculator — 2026 Break-Even

See whether a gas or heat-pump pool heater is actually cheaper to run — weigh up-front install against yearly fuel cost and find the break-even year for your pool.

Heat Pump wins

$3,848 cheaper

Heat Pump

$9,627

Gas

$13,476

Break-even

Year 3

Pool Heating Need

MMBTU
20 MMBTU
150 MMBTU
yr
5 yr
20 yr

Energy Rates

$/kWh
0.05 $/kWh0.4 $/kWh
$/therm
0.5 $/therm4 $/therm

Efficiency

COP
3 COP7 COP
%
70 %95 %

Up-front Cost (installed)

$
2500 $8000 $
$
1500 $6000 $

Heat Pump wins

Saves $3,848 over 10 years · breaks even in year 3

Best
Heat Pump

$9,627

Up-front$4,000
Per year$563
Gas

$13,476

Up-front$2,500
Per year$1,098

Total cost over 10 years

Heat Pump$9,627
Gas$13,476

Cumulative cost over time

Cumulative cost over time — crossover at year 3

What You'll Need

hOmeLabs 4,500 Sq Ft Energy Star Dehumidifier

$200-$2604.5
View on Amazon
Honeywell Home T9 Smart Thermostat with Sensor

Honeywell Home T9 Smart Thermostat with Sensor

$150-$2004.4
View on Amazon

Cooper & Hunter Mini Split AC 12000 BTU 22 SEER

$700-$9004.4
View on Amazon

hOmeLabs 4,500 Sq Ft Energy Star Dehumidifier

$200-$2604.5
View on Amazon
Honeywell Home T9 Smart Thermostat with Sensor

Honeywell Home T9 Smart Thermostat with Sensor

$150-$2004.4
View on Amazon

Cooper & Hunter Mini Split AC 12000 BTU 22 SEER

$700-$9004.4
View on Amazon

As an Amazon Associate, we earn from qualifying purchases.

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Example Calculations

1Average rates, season-long heating

Inputs

Annual pool heating60 MMBTU
Time horizon10 years
Electricity / gas rate$0.16/kWh · $1.50/therm
EfficiencyHeat pump COP 5.0 / Gas 82% AFUE
Installed costHeat pump $4,000 / Gas $2,500

Result

Cheaper optionHeat pump — saves $3,848 over 10 yrs
Heat pump 10-year total$9,627
Gas 10-year total$13,476
Break-evenYear 3

The heat pump runs ~$563/year vs ~$1,098 for gas. Its ~$1,500 higher install is recovered by year 3, then it saves ~$534/year — the clear pick for steady, season-long heating in mild weather.

2Expensive electricity ($0.35/kWh)

Inputs

Annual pool heating60 MMBTU
Time horizon10 years
Electricity / gas rate$0.35/kWh · $1.50/therm
EfficiencyHeat pump COP 5.0 / Gas 82% AFUE
Installed costHeat pump $4,000 / Gas $2,500

Result

Cheaper optionGas — saves $2,834 over 10 yrs
Heat pump 10-year total$16,309
Gas 10-year total$13,476
Break-evenNone — gas wins from day 1

At $0.35/kWh the heat pump runs ~$1,231/year — above the gas heater’s ~$1,098. Gas is now cheaper both up front and yearly, so it dominates with no break-even.

3Short season, occasional use

Inputs

Annual pool heating20 MMBTU
Time horizon5 years
Electricity / gas rate$0.16/kWh · $1.50/therm
EfficiencyHeat pump COP 5.0 / Gas 82% AFUE
Installed costHeat pump $4,000 / Gas $2,500

Result

Cheaper optionGas — saves $609 over 5 yrs
Heat pump 5-year total$4,938
Gas 5-year total$4,329
Break-evenYear 9 (beyond this horizon)

Heating just 20 MMBTU, the heat pump saves only ~$178/year, so its higher install does not pay back inside 5 years — break-even slips to year 9. For occasional, fast-warm-up heating, gas’s lower up-front cost wins.

Did You Know?

For a pool needing about 60 MMBTU of heat a season, a heat pump (COP 5 at $0.16/kWh) costs roughly $563/year to run, versus about $1,098/year for an 82% gas heater at $1.50/therm. The heat pump costs ~$1,500 more to install but saves ~$534/year, breaking even around year 3 and saving ~$3,850 over 10 years. The catch: heat pumps warm the water slowly and stop working below about 50°F ambient air, so gas still wins for fast or occasional heating and for early- and late-season swims in cool weather.

Frequently Asked Questions

Q

Is a heat pump or gas pool heater cheaper to run?

It depends on your electricity and gas rates. A heat pump moves heat instead of burning fuel, delivering 4–6 units of warmth per unit of electricity (its COP), so it is far cheaper to run where power is reasonably priced. For a pool needing about 60 MMBTU of heat a season, a COP-5 heat pump runs ~$563/year at $0.16/kWh, versus ~$1,098/year for an 82% gas heater at $1.50/therm. The heat pump costs about $1,500 more to install but saves ~$534/year, breaking even near year 3 and saving roughly $3,850 over 10 years. Expensive electricity (above ~$0.31/kWh) erases the edge, and gas still wins for fast or occasional heating.

  • Heat pump running cost: ~$563/year (COP 5, $0.16/kWh)
  • Gas running cost: ~$1,098/year (82% AFUE, $1.50/therm)
  • Heat pump installs ~$1,500 higher on average
  • Typical break-even: ~3 years
  • Gas wins for fast warm-ups and cool-weather swims
SystemInstalledRun / year10-Year Total
Heat pump (COP 5)$4,000~$563~$9,627
Gas (82% AFUE)$2,500~$1,098~$13,476
Heat pump @ $0.35/kWh$4,000~$1,231~$16,309
Q

How fast does each pool heater warm the water?

Speed is the heat pump’s weak spot. A gas heater fires at 100,000–400,000 BTU/hour and can raise a pool several degrees in a few hours, so it is ideal for on-demand or weekend heating. A heat pump trickles heat in at a much lower rate and may take a day or more to bring a cold pool up to temperature — fine for holding a set temperature all season, poor for a quick warm-up before a party. Heat pumps also lose output as the air cools and effectively stop below about 50°F ambient, while a gas heater works the same in any weather. If you heat the pool occasionally or want it hot on short notice, gas is the practical choice despite the higher running cost.

  • Gas: 100k–400k BTU/hr — pool warm in hours
  • Heat pump: slow trickle — often a day or more
  • Heat pump output falls as air cools, ~stops below 50°F
  • Gas heats the same in any temperature
  • Occasional / on-demand heating favors gas
Q

What is the break-even point for a heat pump pool heater?

Break-even is when the cheaper-to-run heat pump overtakes the cheaper-to-install gas heater on cumulative cost. Divide the install gap by the yearly running savings: a ~$1,500 higher heat pump install ÷ ~$534/year saved ≈ 3 years at average rates. Two things push break-even out. A short swim season or occasional use shrinks yearly savings — heat just 20 MMBTU and the gap narrows to ~$178/year, stretching break-even past year 8. And a short ownership window can flip the verdict entirely: over only 5 years of light use, the gas heater’s lower up-front price wins outright. Because pool heat pumps last 10–15 years, a break-even under ~7 years usually favors the heat pump.

  • Break-even = install gap ÷ yearly running savings
  • Typical: $1,500 ÷ $534 ≈ 3 years
  • Light season (20 MMBTU): savings ~$178/yr → 8+ years
  • Short 5-year ownership of a light-use pool: gas wins
  • Pool heat pumps last 10–15 yrs → sub-7-yr favors heat pump
Q

Does a heat pump pool heater work in cold weather?

Not well. A pool heat pump pulls warmth from the outdoor air, so its output and efficiency drop as the air cools, and most units cut out around 50°F ambient. That makes it great for extending a summer season in a mild climate but unreliable for early-spring, late-fall, or cold-climate heating — exactly when you most want a quick warm-up. A gas heater is immune to air temperature and will heat the pool on the coldest day, which is why pools in cool regions or those used only occasionally usually pick gas. A common hybrid is a heat pump for everyday season-long heating plus a gas heater for fast boosts and shoulder-season swims.

  • Heat pump efficiency falls with air temp, ~stops at 50°F
  • Best for season extension in mild climates
  • Gas heats in any weather, including cold snaps
  • Cool regions / occasional use → gas
  • Hybrid: heat pump for the season + gas for boosts

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Last Updated: Jun 16, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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