Pool heater repair service is one of those things you don’t think about until you jump into water that should be 85 degrees and it’s closer to 60. Whether your gas heater won’t ignite, your heat pump is blowing cold air, or you’re staring at an error code you’ve never seen before, the fix usually isn’t as scary or expensive as you’d expect. The key is getting a proper diagnosis before anyone starts swapping parts. Here’s everything you need to know about pool heater problems, what repairs actually cost, and when it makes sense to replace instead of fix.
Types of Pool Heaters in North Texas Homes
Gas Pool Heaters
By far the most common in DFW. Gas heaters like the Pentair MasterTemp, Hayward Universal H-Series, and Raypak units heat water fast — a typical 400,000 BTU gas heater can raise pool temperature by 1 to 2 degrees per hour. They’re the go-to for homeowners who want to heat on demand rather than waiting around. Most pool heater repair service calls we get are for gas units because they’re the most widely installed.
Electric Heat Pumps
Heat pumps pull warmth from the surrounding air and transfer it into the water. They’re incredibly energy-efficient — roughly 70 percent cheaper to operate than gas — but they heat slowly, taking one to three days to bring a cold pool up to temperature. They work best when ambient temperatures stay above 50 degrees, which covers most of the DFW season but not those cold January stretches.
Electric Resistance Heaters
Less common and more expensive to run than either gas or heat pumps. These work like a giant water heater element — effective but power-hungry. You’ll mostly see them on smaller pools or spas where the water volume is low enough to keep electric bills manageable.
Solar Pool Heaters
Solar panels on the roof circulate pool water through collectors that absorb heat from the sun. They’re essentially free to operate, but they’re supplemental — they extend your swimming season a few weeks on each end but can’t maintain temperature during cold weather or overnight. Most DFW homes that have solar also have a gas or heat pump backup.
Signs You Need Pool Heater Repair Service
Heater Won’t Ignite or Won’t Stay Lit
The most common gas heater complaint. You hear the click, maybe see a brief flame, but it shuts right back off. Usually a dirty or failed igniter, a corroded flame sensor, or a gas valve issue.
Error Codes on the Display
Modern heaters throw codes when something’s wrong. Pressure switch errors, high limit trips, flame sense faults, and flow errors are the ones we see most. The code tells us where to look, but it doesn’t always tell us why — that takes hands-on diagnosis.
Running But Water Isn’t Getting Warm
If the heater fires up and runs but the pool stays cold, the heat exchanger could be scaled up with calcium, the bypass valve might be open, or there’s not enough flow through the unit. This one trips people up because they think the heater itself is fine.
Declining Water Quality Despite Proper Chemistry
When your water stays cloudy, green-tinted, or develops algae spots even though your chemicals test fine, the problem is almost always equipment — inadequate circulation, poor filtration, or a salt cell that’s not producing enough chlorine.
Strange Noises
Banging, whistling, and popping sounds from your heater are never normal. Banging often means delayed ignition — gas builds up before the igniter fires and you get a mini-explosion in the combustion chamber. Whistling can indicate airflow restrictions or exhaust issues.
Visible Corrosion, Rust, or Leaks
Rust on the exterior is cosmetic. Water dripping from the heat exchanger or header connections is not. Leaks inside the heater mean internal corrosion has won, and you need pool heater repair service before it gets worse or damages surrounding equipment.
Rising Utility Bills
If your gas or electric bill spikes without you changing how often you heat, the heater may be cycling inefficiently — running longer, firing and shutting off repeatedly, or losing heat through a failing exchanger.
Common Pool Heater Problems in DFW
Heat Exchanger Corrosion From Hard Water
This is the big one in North Texas. The NTMWD water supply is loaded with calcium and magnesium that deposits inside copper and cupronickel heat exchangers. Combine that with slightly off pH or low alkalinity, and the corrosion accelerates. Heat exchanger failure is the most expensive pool heater repair service we perform — and it’s almost always preventable with proper water chemistry.
Igniter and Pilot Assembly Failures
Igniters are wear items. They endure thousands of thermal cycles and eventually degrade. Hot surface igniters crack, spark igniters weaken, and flame sensors get coated in oxidation. These are the most common and most affordable pool heater repair service calls — usually a quick fix.
Pressure Switch and Flow Sensor Issues
The pressure switch confirms adequate water flow before allowing ignition. Scale buildup from hard water can restrict flow through the heater or fool the sensor into thinking there’s not enough water moving. Sometimes the switch itself fails, sometimes the real problem is a dirty filter creating backpressure upstream.
Thermostat Malfunction
A drifting thermistor sends inaccurate temperature readings to the control board, causing the heater to overshoot, undershoot, or cycle erratically. Replacement is straightforward and relatively inexpensive.
Freeze Damage to Heater Headers and Connections
Water trapped inside the heater during a DFW hard freeze expands and cracks headers, heat exchanger tubes, and plumbing connections. Copper headers are especially vulnerable. This type of damage usually shows up as leaks the first time you fire the heater after winter.
Clogged Burner Trays
Gas heaters near mature trees — really common in Southlake, Keller, and parts of McKinney — collect leaves, dirt, and debris inside the burner tray. Clogged burners produce uneven flames, soot buildup, and incomplete combustion. An annual cleaning prevents most burner-related pool heater repair service calls.
Pool Heater Repair Service Costs in North Texas
$100 to $250 installed. The most common repair and usually the quickest. Most techs carry igniters on the truck for same-day fixes.
Heat Exchanger Repair or Replacement
$300 to $1,200. This is the expensive one. Minor scale removal and cleaning sits at the low end. Full heat exchanger replacement pushes toward the high end, and at that price you’re getting close to replacement territory on older units.
Thermostat or Sensor Replacement
$100 to $300. Thermistors and high-limit switches are inexpensive parts. Most of the cost is the diagnostic labor to confirm which sensor is actually causing the problem.
Gas Valve Replacement
$200 to $500 installed. Gas valve work requires a state-licensed contractor in Texas due to safety regulations. The job includes valve removal, installation, gas line reconnection, leak testing at all connections, and pressure verification.
Full Heater Replacement
$1,500 to $4,500 installed depending on type, BTU rating, and brand. Gas heaters land in the $1,500 to $3,500 range. High-efficiency heat pumps run $2,500 to $4,500. Labor in DFW averages $75 to $150 per hour for licensed heater work.
Pool Heater Repair vs. Replacement
Gas heaters last 7 to 10 years in Texas. Heat pumps last 10 to 15 years with proper maintenance. If your heater is under 7 years old and the repair is under $500, fix it without hesitation. If it’s over 10 years old and you’re looking at a $800-plus repair, replacement usually makes more sense — especially because modern heaters are significantly more efficient.
A new unit might pay for itself in lower gas or electric bills within a few seasons. The gray zone is 7 to 10 years. In that range, consider whether this is the first failure or the third one this year. A well-maintained 8-year-old heater with a $200 igniter swap has plenty of life left. That same heater with a cracked heat exchanger and a history of repeat pool heater repair service calls? Probably time to move on.
People Also Ask About Pool Heater Repair Service
How long do pool heaters last in Texas?
Gas heaters typically last 7 to 10 years. Heat pumps last 10 to 15 years. Our hard water, extreme summer heat, and winter freezes shorten lifespans compared to milder climates. Annual maintenance and proper water chemistry are the biggest factors in how long yours will go.
Why won’t my pool heater ignite?
The most likely causes are a failed igniter, a dirty flame sensor that can’t detect the flame, a tripped pressure switch from low water flow, or a gas supply issue. Before calling for pool heater repair service, check that the pump is running, the filter isn’t clogged, and the gas valve is open. If those are all fine, it’s time for a tech.
Can hard water damage my pool heater?
Absolutely. DFW’s hard water deposits calcium and mineral scale inside the heat exchanger, restricting flow and reducing heat transfer. Over time, this scale corrodes copper and cupronickel components from the inside. Keeping pH between 7.2 and 7.6 and calcium hardness between 200 and 400 ppm dramatically slows this process.
What size pool heater do I need?
Most residential pools in North Texas — 15,000 to 25,000 gallons — do well with a 300,000 to 400,000 BTU gas heater or a 110,000 to 140,000 BTU heat pump. Oversizing heats faster but costs more upfront. Undersizing means the heater runs constantly and wears out sooner. Your pool volume, desired temperature rise, and how quickly you want to heat determine the right size.
Is it worth repairing a 10-year-old pool heater?
It depends on what broke. A $150 igniter on a 10-year-old heater that’s been well-maintained? That’s an easy yes. A $1,000 heat exchanger on a heater that’s already had multiple repairs? Probably better to invest in a new unit and get the efficiency gains and warranty coverage that come with it.
PoolBurg’s Pool Heater Repair Service Covers Every Brand and Every Type
PoolBurg provides pool heater repair service for gas heaters, electric heat pumps, and every major brand in North Texas — Pentair MasterTemp, Hayward Universal H-Series, Raypak, Jandy JXi, and Sta-Rite Max-E-Therm. We carry the most common failure parts on every service truck so more repairs get finished on the first visit. Every technician is TDLR-licensed for gas appliance work, and we give you an honest assessment before we touch a single part. If replacement makes more sense than repair, we’ll tell you that too.
Pool not heating? Call PoolBurg for same-day heater diagnostics.
We’ll find the problem, explain your options, and get your water warm again.
Visit poolburg.com or call us today.
