Three Kinds of Pool Heater, Three Kinds of Problems
Before you can estimate a repair, you need to know what you have.
- Gas heaters (natural gas or propane) heat fast and work in any weather. They have the most parts that can fail: igniter, pressure switch, thermostat, control board, heat exchanger.
- Heat pumps pull warmth from the air. Fewer failure points, but the ones they have (compressor, fan motor, refrigerant) cost more.
- Solar heaters are panels and a valve. Almost nothing to repair except leaks and the controller.
If your heater won't fire, the fix might be $150 or it might be a new unit. Here's how to tell which.
Common Gas Heater Failures and Repair Costs
| Problem | Symptom | Typical Repair (2026) |
|---|---|---|
| Igniter or ignition module | Clicks, no flame | $150–$400 |
| Pressure switch | Won't fire, "LO" or pressure error code | $150–$350 |
| Thermostat or temperature sensor | Heats wrong or shuts off early | $150–$300 |
| Control board | Error codes, dead display | $300–$700 |
| Gas valve | Fires briefly, shuts down | $300–$600 |
| Heat exchanger | Leaking water, sooting, rust at the vent | $800–$1,800 |
| Service call / diagnosis | $100–$200 |
The heat exchanger is the big one. On a heater under 5 years old it's often worth replacing. On an older unit, a failed exchanger usually means it's time for a new heater.
Heat Pump Repair Costs
| Problem | Typical Repair (2026) |
|---|---|
| Fan motor | $300–$600 |
| Capacitor or contactor | $150–$350 |
| Thermistor or flow switch | $150–$300 |
| Control board | $400–$800 |
| Refrigerant leak and recharge | $400–$900 |
| Compressor | $1,200–$2,500 |
A compressor failure on a heat pump over 8 years old is a replace, not a repair.
Solar Heater Repair Costs
- Panel leak or cracked header: $150–$500 per panel
- Diverter valve or actuator: $150–$400
- Controller or sensor: $150–$350
- Full panel replacement: $2,500–$6,000 depending on roof area
Solar systems rarely need a tech beyond leaks and the valve, which is part of why they're popular in Florida and Arizona.
What Pool Heater Replacement Costs
| Heater Type | Installed Cost (2026) |
|---|---|
| Gas heater (natural gas) | $2,500–$5,000 |
| Gas heater (propane) | $2,500–$5,500 |
| Heat pump | $3,000–$5,500 |
| Solar system | $3,000–$7,000 |
Add $300–$1,000 if the gas line, electrical, or plumbing needs to change. Removal and disposal of the old unit is usually a small line item.
The Repair-or-Replace Rule
Most techs use the same rule for heaters that they use for pumps: if the repair costs more than half of replacement and the heater is 8 years or older, replace it.
A $600 control board on a 4-year-old gas heater is an easy yes. The same $600 board on a 12-year-old heater with a rusty exchanger is money spent on a unit that's about to need more. Ask the tech how the rest of the heater looks, not just the part that failed. A good one will tell you.
Gas heaters typically last 8–12 years. Heat pumps 10–15. Solar panels 15–20.
Fall Is the Right Time to Deal With It
In seasonal markets, heater problems show up in September and October when the water cools and people turn the heater on for the first time since spring. That's also when repair companies are slammed with closings. If your heater struggled last season, get it looked at in August or early September, before the rush. In year-round markets, the heater matters most from November through March, so get it checked in October.
For how a heater repair fits into other equipment costs, see Pool Repair Near Me: What to Know Before You Call. For pump-specific problems, see Pool Pump Not Working? Common Problems & Repair Costs.
How to Find a Pool Heater Repair Company
- 1Confirm they work on your fuel type. Gas work requires specific licensing in most states. Not every pool company has it.
- 2Ask about brand certification. Manufacturer-certified techs get parts faster and the warranty stays intact.
- 3Ask if the diagnosis fee is credited toward the repair.
- 4Get the repair and replacement quotes side by side. A good company will give you both without being asked.
- 5Verify the license. Every listing on Pool Service Scout links to your state's lookup.
Browse Pool Repair Companies by City
Some of the most-searched markets:
- Sarasota, FL · Naples, FL · Fort Myers, FL · Tampa, FL · Ocala, FL
- Lake Havasu City, AZ · Corpus Christi, TX · Fort Worth, TX · San Antonio, TX
- Bakersfield, CA · Fresno, CA · Oklahoma City, OK · Tulsa, OK
Or by state: Florida, Texas, Arizona, California, Nevada, Georgia.
Bottom Line
Know your heater type, get the diagnosis, and apply the half-of-replacement rule before you approve anything. Compare pool repair companies near you and call one that works on your fuel type.