What Does a Pool Heater Cost? Gas vs Heat Pump vs Solar

In 2026, a pool heater costs $2,500 to $8,000 to install and anywhere from $10 to $600+ a month to run, depending entirely on which of the three types you pick — gas, heat pump, or solar. The purchase price is the easy part; the running cost is where the types split apart, often by 10x or more over a season. Here's the full picture so you can match the heater to how you actually swim.

Two numbers, not one

Every heater decision is really two costs:

1. Install — the unit plus labor, gas line or electrical hookup, and plumbing tie-in.
2. Operating — what it costs to keep the water warm, month after month.

A cheap heater that's expensive to run can cost far more over five years than a pricier one that sips energy. So compare both numbers together, not the sticker price alone.

The three heater types, compared

Heater type	Install (2026)	Monthly running cost	Heats on demand?	Typical lifespan
Gas (natural gas / propane)	$2,500–$5,000	$300–$600+	Yes — fast	5–10 years
Heat pump (electric)	$3,000–$6,000	$100–$300	Yes, in mild air	10–15 years
Solar	$3,000–$8,000	$10–$30	No — sun-dependent	10–20 years

Ranges assume an average residential pool (roughly 400–600 sq ft of surface) and a typical season. Bigger pools, colder climates, and higher target temperatures push every number up.

Gas: cheapest to buy, priciest to run

A gas heater burns natural gas or propane to heat water fast — it can raise a pool several degrees in hours, which makes it the go-to for spas and for owners who want heat on demand. Install runs about $2,500–$5,000, more if a new gas line or a larger meter is needed.

The catch is fuel cost. Active heating can run $300–$600+ a month, and propane is pricier than natural gas. Gas earns its keep when you heat occasionally and want it hot now — not when you're trying to hold a warm pool all season.

Heat pump: the efficiency sweet spot

A heat pump doesn't make heat; it moves it, pulling warmth from the outside air into the water using electricity. That makes it three to five times more efficient than gas to run — typically $100–$300 a month — for a higher install of about $3,000–$6,000.

The trade-off is that efficiency falls as the air cools. Below roughly 50°F, a heat pump struggles and slows down, so it's happiest extending a season in mild climates rather than fighting a cold snap. In a long-season state it's often the lowest total cost of ownership.

Solar: almost free to run, but on the sun's schedule

Solar pool heating is plumbing, not electricity: your pump pushes water through black roof collectors that the sun warms directly. Install is $3,000–$8,000, and running cost is just the extra pump time — about $10–$30 a month. Over years, that near-zero fuel cost usually wins.

The limitation is control. Solar only heats when the sun is out, so it extends your season rather than guaranteeing a temperature on a cool evening. Many owners pair it with a small gas or heat-pump backup. We break the economics down in solar pool heating cost.

What actually moves your operating cost

The heater type sets the baseline, but four things swing the monthly bill more than people expect:

• A pool cover. This is the single biggest lever. An uncovered pool loses most of its heat to overnight evaporation; a cover cuts any heater's running cost by 50–70%. Don't heat a pool you won't cover.
• Climate and season length. A 12-month Florida season and a 5-month Minnesota season are completely different bills, even with the same heater.
• Target temperature. Every degree warmer costs more — holding 88°F for a spa-like swim costs far more than 80°F.
• Pool size. Heating cost scales with surface area, since that's where heat escapes.

These usually matter more than which brand you buy. See which pool features are worth it for where heating fits among the optional extras.

Bottom line

• Want heat now and occasionally? Gas — cheap to buy, expensive to run.
• Want the lowest year-round running cost in a mild climate? Heat pump.
• Want the cheapest heat over time and you have roof sun? Solar, ideally with a small backup.

Install and running cost both scale with your pool size, climate, and how warm you keep the water. Plug in your numbers to see the install range and seasonal cost for each option side by side.

Open the pool heating calculator →