Budget around $5,200 installed for a typical pool heater in 2026, plus roughly $650 a year to run it for normal seasonal use. Both numbers swing with the heater technology you choose, your climate, and, more than anything, how warm you insist the water be and for how many months.
A heater is the feature that most changes what a pool is: in much of the country it's the difference between a three-month pool and a six-month one. Here's how to think about the cost honestly.
The three heater technologies
All three land in the same broad install territory around that $5,200 average, but they split the bill very differently between day one and every day after:
| Type | Install cost profile | Running cost profile | Best for |
|---|---|---|---|
| Gas (natural gas / propane) | Usually the lowest upfront of the three | Highest per hour of heating, you burn fuel on demand | Fast heat-ups, occasional weekend use, spas |
| Electric heat pump | Typically above the average upfront | Lowest per degree in warm air, it moves heat rather than making it | Steady season-long heating in mild-to-warm climates |
| Solar | Highest upfront (panels + plumbing) | Near zero, sunshine is the fuel | Sunny regions, patient owners, longest-horizon savings |
The honest caveats: a heat pump's efficiency falls as air temperature drops, so it's a poor match for extending the season deep into a northern fall. Gas heats anything, anytime, fast, you just pay for every session at local fuel prices. Solar depends on sun and roof/yard space, and works best as a season-stretcher rather than an on-demand heater. Local fuel and electricity prices decide the real winner, which is why the guide gives profiles rather than pretending one number fits every ZIP code.
What drives the running cost
- Water volume. Every gallon must be warmed and kept warm. Bigger pools cost more to heat, and depth counts double, the model adds about $200 a year in running costs for a diving deep end simply because there's more water. (A deep end also adds ~20% to the build itself.)
- Target temperature. Each extra degree you demand costs disproportionately more, because the pool loses heat faster the warmer it is relative to the air.
- Season length. Heating through May and September costs far more than topping up July. Owners chasing a six-month season in a cold state should budget above the $650 average; a southern owner taking the edge off spring evenings will land below it.
- An attached spa adds its own ~$400 a year, it's kept hotter and used year-round.
See the heater's effect on your total. Toggle the heater in the calculator and watch both the build cost and the yearly upkeep line update.
Try the pool cost calculator →The cheapest heat is the heat you don't lose
Most of a pool's heat escapes from the surface, primarily through evaporation. Covering the water when it's not in use is the single highest-return move a heated-pool owner can make:
- Manual cover: $1,000–$3,600, cheap insurance for your heating dollars, at the cost of a nightly ritual.
- Automatic safety cover: $8,000–$20,000, one-button convenience plus a real safety layer, priced accordingly.
Pairing any heater with a cover routinely beats a bigger heater without one. If you're choosing where the next dollar goes, the cover wins.
North vs. south: what a heater buys you
The value of a heater depends on where you swim, the same logic behind the regional cost guide:
- Northeast / Midwest: the unheated season is short, roughly June through August. A heater realistically buys you May, September, and often October: potentially doubling your swimming months. This is why northern builders treat heaters as near-standard equipment, and why running costs there sit above the $650 average.
- South: the unheated season is already long. A heater's job shrinks to smoothing the shoulder months and warming the odd cool evening, many southern owners skip one entirely, or size small and run it rarely, landing below the average.
Put bluntly: the colder your state, the more a heater costs to run, and the more swimming it buys you per dollar.
Sizing and installation notes
- Size to the pool, not the price tag. An undersized heater runs constantly and still disappoints; heater capacity should match your water volume and target season. This is a place to trust your installer's load math over a bargain SKU.
- Electrical and gas lines are part of the quote. Heaters often need dedicated electrical service or gas plumbing, pool projects commonly carry $2,000–$10,000 of electrical work overall, and retrofitting a heater later can reopen that line item. Deciding at build time is cheaper than deciding after.
- Upkeep interaction: heated water holds chemicals differently and evaporates faster, nudging the rest of your annual maintenance bill upward. The $650 figure covers fuel/electricity, not that secondary effect.