Pool Heaters in St. Petersburg, FL: Heat Pump vs. Gas vs. Solar
For most pools in St. Petersburg, a heat pump is the best heater. Our mild Gulf Coast winters keep the air above the roughly 50-degree mark where heat pumps run efficiently, so you get the lowest monthly running cost. A gas heater heats faster and suits spas or on-demand use, and solar costs the least to run but heats slowly.
A pool heater is what turns a Florida pool from a three-season amenity into a year-round one, keeping the water comfortable through the cooler months from late fall to early spring. In Florida, a heat pump typically saves $8,000 to $20,000 over gas across five years, per 2026 figures from Cost to Renovate. The right choice comes down to how fast you need heat, how often you swim, and what you want to pay each month.
Key takeaways
- A heat pump is the default choice for St. Petersburg pools, because local winters keep the air above the roughly 50-degree floor where heat pumps stay efficient.
- Heat pumps cost more upfront but run for a fraction of gas: about $50 to $150 a month versus $150 to $600 for gas in a warm climate, per 2026 Cost to Renovate figures.
- A gas heater is the fastest, raising water about 1 to 2 degrees per hour, which makes it the pick for spas or heating a pool on short notice.
- Solar has the lowest lifetime cost in a sunny climate at $800 to $2,500 installed with near-zero fuel cost, but it heats slowly and depends on the weather.
- A pool cover cuts heating costs by 50 to 70 percent no matter which heater you run, according to ENERGY STAR.
The three pool heater types, compared
There are three mainstream ways to heat a residential pool, and each has a clear use case. A heat pump moves existing warmth from the air into your water, a gas heater burns natural gas or propane to create heat directly, and a solar system pumps water through roof panels to warm it in the sun. The table below shows how they stack up for a Florida pool.
| Heater type | Installed cost | Monthly cost | Best for |
|---|---|---|---|
| Heat pump | $3,000 to $8,000 | $50 to $150 | Most St. Pete pools; lowest running cost, longest lifespan |
| Gas heater | $1,500 to $5,000 | $150 to $600 | Spas, on-demand heat, and fast recovery before a storm |
| Solar | $800 to $2,500 | Near zero | Owners who want the lowest fuel cost and can accept slower, weather-dependent heat |
Cost ranges above are 2026 figures from Cost to Renovate. Utility connections can add to the install: running a new gas line from the meter adds roughly $400 to $1,500, and a new 240-volt circuit for a heat pump adds about $500 to $1,500 if power does not already reach your equipment pad.
Why a heat pump is the default in St. Petersburg
A pool heat pump works like an air conditioner in reverse. Instead of burning fuel, it pulls warmth out of the surrounding air and transfers it into the water through a titanium heat exchanger that resists chlorine corrosion. Because it moves existing heat rather than creating it, it delivers far more heat per dollar of energy.
That efficiency is measured as a coefficient of performance, or COP. Pool heat pumps typically run a COP of 4 to 6, meaning they deliver four to six units of heat for every unit of electricity, compared with about 82 percent thermal efficiency for a gas heater at the federal minimum standard. The catch is temperature: heat pumps run efficiently down to roughly 50 degrees of ambient air, and below that their output drops off sharply.
This is exactly why the same unit that struggles up north is a clear win here. St. Petersburg's mild winters keep the air above about 55 degrees on most days, so a heat pump stays in its efficient range for essentially the whole swim season. It also lasts longer: heat pumps regularly reach 10 to 15 years against 5 to 10 for gas, per U.S. Department of Energy figures cited in 2026.
When a gas heater makes sense
Gas heaters win on one thing above all: speed. A gas heater raises water temperature about 1 to 2 degrees per hour, the fastest of any option, and it does that regardless of how cold the outside air is. That makes it the right call for a spa you want hot in twenty minutes, for a pool you only heat for the occasional weekend, or for fast recovery when you need warm water on short notice.
The tradeoff is running cost. For maintaining an 82-degree pool, 2026 figures put gas heaters at roughly $260 to $600 a month against $50 to $320 for a heat pump. If you heat often, that gap compounds fast. Some owners run a hybrid setup, using a heat pump for everyday heating and a gas heater only for the spa or a rare cold snap, which captures the speed of gas without the full monthly bill.
Solar pool heating in Florida
Solar has the lowest lifetime cost of any option in a sunny state, since the only running cost is the electricity to pump water through the panels. A solar system runs $800 to $2,500 installed with a 15 to 20 year lifespan, longer than either gas or a heat pump. Florida's sun makes it viable in a way it simply is not further north.
The limits are speed and control. Solar heats slowly and only when the sun is out, so it cannot hold a set temperature on a cloudy stretch or a cool evening the way a heat pump can. Many owners who want the lowest bills pair solar with a small heat pump as backup, using the sun when it is available and the heat pump to top off when it is not.
What it costs to heat a pool near St. Pete
Total cost has two layers: the one-time install and the monthly running cost. On install, gas and solar are cheapest upfront and a heat pump costs more. On running cost, that order flips: a heat pump is cheapest to operate month to month, gas is the most expensive, and solar is nearly free to run.
Over five years, that flip is why a heat pump usually saves $8,000 to $20,000 versus gas in a nine-month Florida season, according to 2026 Cost to Renovate figures. The single biggest lever on any heater's monthly bill is a pool cover, which cuts heating costs by 50 to 70 percent by holding heat in overnight, per ENERGY STAR. Whatever heater you choose, a cover pays for itself.
Sizing and installation basics
A heater has to be sized to your pool's volume, or it will run constantly and never reach your set temperature. Heaters are rated in BTU per hour, and an undersized unit is the most common installation mistake, especially on cooler nights when it can never quite catch up. Getting the size right the first time matters more than shaving a few dollars off the unit price.
Installation also depends on the utility connection your equipment pad already has. A heat pump needs a dedicated 240-volt electrical circuit, and a gas heater needs a gas line run to the pad. If those are not already in place, they add to the total, which is worth knowing before you compare quotes. Most people set a heated pool somewhere between 78 and 82 degrees for comfortable swimming, and a well-sized unit holds that steadily.
Signs your heater needs repair or replacement
A heater that runs but never reaches the set temperature, short-cycles on and off, throws an error code, or leaks around the unit is telling you something is wrong. Many of these are repairs rather than replacements: failed ignitors, sensors, control boards, and pressure switches are all fixable. If your salt pool's chemistry keeps drifting, our salt vs. chlorine guide covers how the two systems differ.
Replacement usually makes more sense when the unit is past its expected lifespan, the heat exchanger itself has failed, or a repair costs nearly as much as a newer, more efficient unit. On every weekly visit, BrightWater checks pump, filter, and heater performance together, since a heater problem is often really a circulation problem. Curious how the rest of that system should run? See our pump run-time guide.
Cold water cutting your swim season short? BrightWater installs, repairs, and services gas and electric heaters across St. Petersburg and Pinellas County.
Get Your Free QuoteFrequently asked questions
What kind of pool heater is best for St. Petersburg, FL?
For most St. Petersburg pools, a heat pump is the best choice. The area's mild winters keep the air above the roughly 50-degree floor where heat pumps run efficiently, which gives you the lowest monthly running cost. Gas heaters heat faster and suit spas or on-demand use, while solar has the lowest fuel cost but heats slowly.
How much does it cost to run a pool heater in St. Petersburg?
In a warm climate like St. Petersburg, a heat pump costs roughly $50 to $150 per month to run, while a gas heater runs about $150 to $600 per month depending on gas prices and pool size, according to 2026 figures from Cost to Renovate. Solar has a near-zero monthly fuel cost. A pool cover cuts heating costs by 50 to 70 percent regardless of heater type.
Do you really need a pool heater in Florida?
A St. Petersburg pool stays comfortable on its own for most of the year, but water usually drops below a comfortable swimming range for about four to six months from late fall through early spring. A heater is what lets you use the pool year-round instead of losing it during the cooler stretch.
How long does a pool heater last?
Gas pool heaters typically last 5 to 10 years, while heat pumps regularly reach 10 to 15 years or more with basic maintenance, according to U.S. Department of Energy figures cited in 2026. That longer lifespan is a major reason a heat pump usually wins on total cost over time in Florida.
Which heats a pool faster, gas or a heat pump?
A gas heater is the fastest, raising water temperature about 1 to 2 degrees per hour regardless of the outside air, per 2026 figures from Cost to Renovate. A heat pump heats more gradually and works best when the air stays above roughly 50 degrees, which is why gas is often chosen for spas or heating a pool on short notice.
Can you repair a pool heater, or does it need to be replaced?
Many heater problems are repairs, not replacements. Failed ignitors, sensors, control boards, and pressure switches can often be fixed. Replacement usually makes more sense when the unit is past its expected lifespan, the heat exchanger has failed, or repair costs approach the price of a new, more efficient unit. BrightWater diagnoses the unit before recommending either path.
Sources
- Cost to Renovate, "Pool Heater Cost in 2026: Gas vs. Heat Pump vs. Solar," updated May 2026.
- ElectrifyCost, "Pool Heat Pump Guide 2026: Sizing, vs Gas, Operating Cost," July 2026.
- Varmin Pool, "Are Pool Heat Pumps Worth It? An Honest 2026 Buyer's Guide," June 2026, citing U.S. Department of Energy and Vita Pool Supply.
- Florida's Best Pools, "Pool Heaters: Gas, Heat Pump, and Solar Compared," updated April 2026.
- ENERGY STAR, "Pool Pumps," pool cover heating-cost guidance, U.S. Department of Energy and EPA.
- U.S. Department of Energy, 10 CFR 431.66, residential gas pool heater thermal efficiency standard.