4 Signs You Should Replace Your Pool Heater Instead of Repairing It
A pool heater that won't ignite, rising gas bills, rust on the cabinet, or a cracked heat exchanger all raise the same question: fix it or replace it. The right answer depends on the age of the unit, what's actually failed, and whether the repair cost is chasing a heater that's already past its useful life. This guide from Adams Pool & Spa explains how a pool heater technician thinks through the repair-vs-replace call, including the 50% rule, lifespan expectations, BTU sizing, and whether it makes sense to swap a gas pool heater for an electric heat pump at replacement time.
When should you repair vs replace a pool heater?
Repair your pool heater if it's under 8 years old and the repair cost is less than half the price of a new unit. Replace it if the heat exchanger has failed, the heater is over 10 years old, or you've had repeat service calls in the last year. A new heater usually pays back through lower gas bills and longer swim seasons.
Pool heater repair vs replacement: quick comparison
| Factor | Repair Makes Sense | Replace Makes Sense |
|---|---|---|
| Heater age | Under 8 years | Over 10 years |
| Repair cost vs new unit | Less than 50% | More than 50% |
| Symptom | Pilot, igniter, sensor, gas valve, thermostat | Cracked heat exchanger, rusted burner tray |
| Efficiency | Still rated 82%+ | Noticeably higher gas bills |
| Repair history | First or second visit | Third call in 12 months |
| Parts availability | Parts still stocked | Discontinued or back-ordered parts |
| Warranty | Still under warranty | Out of warranty |
Signs your pool heater can be repaired
Most pool heater problems are component failures, not whole-unit failures. If the body of the heater is in good shape and parts are still available, a repair is usually the right move.
Signs it's time to replace your pool heater
Some failures aren't worth fixing. The usual suspects:
How long does a pool heater last?
A well-maintained residential pool heater usually lasts 8 to 12 years. Some get to 15 with great water chemistry and light use. Others fail at 6 or 7 years from bad chemistry, hard water scaling the heat exchanger, or rodent damage inside the cabinet.
Heat pumps, because they don't run a combustion flame across a copper exchanger, often last a little longer than gas heaters when they're sized and installed correctly.
If your heater is past 10 and has a major failure, replacement almost always beats repair.
The 50% rule for pool heater repair costs
Here's the shortcut we use on every diagnostic:
If the repair costs more than 50% of a new heater installed, replace it.
Example: a new mid-range 400,000 BTU natural gas pool heater runs roughly $3,500 to $5,500 installed in the Long Beach area. If your repair quote comes in at $2,000 for a heat exchanger replacement on an 8-year-old unit, you're at or above the 50% line. You're paying most of the price of a new heater to keep an older one going.
Under 50%, repair. Over 50%, replace. And if the heater is already 10+ years old, drop that threshold to 30-40%, because the rest of the unit is on borrowed time.
Should you replace your gas heater with a heat pump?
Replacement is the one time you can change heater types without extra cost or hassle. It's worth thinking about before you commit.
Gas pool heaters win when you heat occasionally, want the pool hot in two hours for a weekend party, or need to heat in cold weather. They don't care about air temperature.
Electric heat pumps win when you swim regularly, want to hold a consistent temperature through the season, and live in a mild climate. They cost more upfront, but they run 50 to 70% cheaper per hour. In Long Beach and most of LA County, the climate is ideal for heat pumps because air temperatures stay above the ~50°F floor where heat pumps lose efficiency.
If you're already spending to replace the heater, this is the moment to run the numbers on both options. Our full breakdown lives on the gas vs electric pool heater comparison page.
Pool heater repair vs replacement: cost breakdown
Rough 2026 numbers for residential pool heaters in the Long Beach area:
Repair costs
What size pool heater do I need?
A quick BTU sizing rule for Southern California residential pools:
Pool surface area (sq ft) × temperature rise needed × 12 = BTU/hour output
For a typical 15,000 to 20,000-gallon Long Beach pool wanting a 20-degree rise, that lands in the 300,000 to 400,000 BTU range for a gas heater or about 120,000 to 140,000 BTU for a heat pump. Undersized heaters run longer, work harder, and die younger. Oversized heaters cost more and cycle too often. Sizing matters.
We walk through this with every heater replacement so the new unit matches your pool and swim-season goals.
Pool heater repair and replacement in Long Beach
Adams Pool & Spa has been repairing and replacing pool heaters in Long Beach and across LA County for about 15 years. We're Pentair Expert Installers and Jandy Certified, we offer a 24-hour callback guarantee, and we give you both repair and replacement quotes on the same visit so you can make the call on real numbers.
Our residential pool repair service covers full heater diagnostics, heat exchanger replacements, full heater swaps, and gas-to-heat-pump conversions. We're based in Long Beach and serve every surrounding neighborhood in our service area.
Call Adams Pool & Spa at (562) 439-2693 for a heater diagnostic, or read more about our team.
Pool heater repair vs replacement FAQs
How much does it cost to replace a pool heater?
Installed, a 400,000 BTU natural gas pool heater runs about $3,500 to $5,500 in 2026. Electric heat pumps run $4,500 to $7,500 for mid-range units. Gas line work and electrical upgrades can add to either figure.
Is it worth repairing a 10-year-old pool heater?
Usually no. At 10+ years, the heat exchanger, burner tray, and controls are all aging together. A $1,500 to $2,000 repair buys a year or two at most, while a new unit gives you 8 to 12 years, a fresh warranty, and lower operating cost.
Can a cracked heat exchanger be repaired?
No. Heat exchangers can't be patched. The fix is a full heat exchanger replacement, which usually costs 40 to 60% of a new heater. In most cases we recommend replacing the whole unit instead.
How do I know if my pool heater is dying?
Watch for rising gas bills, yellow flames or soot, rust through the cabinet, repeat ignition failures, and error codes that keep coming back after repairs. Two or three of those together on a heater past 8 years old is usually a replace.
Compared on this page: heater repair vs. replace
Heater age plus the chemistry driving the corrosion are both decision inputs.
- Heat pump
-
An electric pool heater that moves heat from the air into pool water. Lower operating cost than gas in mild Long Beach winters; longer warm-up time than gas.
- Alkalinity
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Total alkalinity is the buffering capacity of pool water against pH swings. Held between 80 and 120 ppm, it stops chemistry from rising or falling on every dose.
- Long Beach
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The Pacific-coastal Los Angeles County city where Adams Pool & Spa is based. Long Beach pools share salt-air corrosion patterns, hard-water scaling, and a year-round swim season that drives weekly chemistry cadence.