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We have seen every way a pool heater can develop a leak. Here are the problems our clients contact us about most often.

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Water Dripping From Inlet or Outlet Fittings

Thermal expansion and contraction over multiple seasons can loosen threaded fittings at the inlet and outlet connections until they begin to drip. Left alone, the slow drip works its way into the cabinet and reaches the control board and gas components. We inspect, reseal, and tighten all external connections and test under operating pressure to confirm the repair holds.

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Pool Heater Pressure Relief Valve Dripping

A pressure relief valve that drips constantly has either reached the end of its service life or has debris in the seat preventing it from closing fully. Running a heater with a compromised relief valve is a safety concern because the valve can no longer respond correctly to pressure spikes. We test system pressure, replace the failed valve, and confirm the new valve seats properly under real operating conditions.

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Water Leaking Inside the Pool Heater Cabinet

Internal leaks are often caused by corroded heat exchanger tubing, worn bypass valve seals, or loose internal plumbing connections not visible from the outside. This type of leak tends to cause corrosion damage to surrounding components before it is discovered. We open the cabinet, trace the internal leak source systematically, and replace only the components that have failed.

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Corrosion Staining on the Pool Heater Cabinet

Brown or green staining on the outside of the heater cabinet usually indicates a slow internal leak that has been seeping through the unit for some time. By the time staining appears on the casing, the leak has typically been running long enough to cause corrosion on nearby components. We trace the internal source, assess the extent of the corrosion damage, and recommend the most cost-effective path to a lasting repair.

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Pool Heater Heat Exchanger Pinhole Leak

Aggressive pool water chemistry gradually dissolves the copper tubing inside the heat exchanger until a pinhole forms and water begins bypassing containment. This type of leak allows pool water and combustion gases to potentially mix, which is both a water quality concern and a safety issue. We perform a pressure test to confirm heat exchanger failure and provide a clear comparison of repair versus replacement costs.

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Pool Heater Bypass Valve Leaking

The bypass valve controls water flow around the heater when circulation is needed without heating. The valve stem seal can wear over time and begin to weep water at the valve body. Ignoring a bypass valve leak allows water to reach internal electrical components and causes progressive corrosion. We replace the valve or reseal the stem depending on the condition of the assembly.

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Pool Losing Water Faster Than Evaporation

If your pool water level drops faster than normal evaporation rates account for and there are no visible exterior leaks, the heater heat exchanger may be allowing water to escape through a breach in the tubing. This is a less obvious presentation of a heat exchanger leak that often goes undiagnosed for a full season. We use a pressure test to isolate the heater as the source and assess the extent of the exchanger damage.

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Pool Heater Leaking After Winter

Pool water left in the heat exchanger during winter expands as it freezes and can crack both the tube walls and the header casting. This damage often does not present until the first spring startup, when operating pressure makes the cracks active leaks. We assess the full extent of the freeze damage and determine whether a partial repair or full exchanger replacement is the right solution.

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Same Leak Keeps Coming Back

A leak that returns to the same spot after a previous repair usually means the repair was incomplete, the root cause was not fully addressed, or the surrounding material has degraded further since the original work. We run a fresh diagnostic, test the full exchanger under pressure, and determine whether a more comprehensive repair or a full exchanger replacement is the right answer to stop the recurring failure.

Reviews

What Our Customers Say

★★★★★

Turned out to be just condensation

I panicked when I saw water under the heater and called right away. The technician explained it was normal startup condensation and showed me exactly what to watch for if it ever became a real leak. Saved me an unnecessary repair.

★★★★★

Found the leak was actually from the top

The puddle was at the bottom of the heater but Gas Services Edmonton traced it back to a header leak near the top of the unit. Would never have found that ourselves. Fixed properly and completely dry since.

★★★★☆

Good service, gasket took an extra day

Our specific gasket wasn't on the truck so we waited a day for it to arrive. The technician was upfront about it from the start and the actual repair was quick once the part showed up.

★★★★★

Water near the wiring got priority

We noticed water pooling close to the control board and called immediately. Gas Services Edmonton got someone out same day given the electrical risk and fixed the actual leak source, not just the symptom.

★★★★★

Bucket test ruled out the heater entirely

We assumed the heater was leaking based on water loss but Gas Services Edmonton ran a bucket test and showed us it was actually just evaporation from a hot windy week. Saved us from an unnecessary repair call.

★★★★★

Explained our water chemistry mistake

We had no idea our pH had drifted low enough to start corroding the heat exchanger. The technician walked us through testing frequency and what to watch for so this doesn't happen again next season.

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