Gas Heater Leaking Water?
Most water leaks come from one of four sources — the pressure-relief valve, internal pipe joints, the heat exchanger, or condensation drainage. Homeone's LGSW-licensed technicians identify the source on-site and tell you honestly whether it is a repair or a replacement. Same-day inspection across Singapore.
If water is dripping or you smell gas, turn off the gas isolator immediately, switch off the unit at the MCB, and contact us. Water leaking can cause corrosion that affects combustion safety over time.
Where Is the Water Actually Coming From?
A leaking gas water heater rarely leaks for no reason. The location of the drip tells the technician — and you — which component has failed. Pressure-relief valve, pipe joint, heat exchanger, or condensation line: each points to a different fix and a different urgency.
Repair or Replace?
A Leaking Heater Is Not Always a New Heater: What the Source of the Leak Actually Costs
Not every leak means a replacement. The location of the leak — and the age of the unit — usually decides whether the right answer is a $60 part swap or a new heater. Here is how Homeone's LGSW-licensed technicians frame the decision on-site, so you know what to expect before we arrive.
Pressure-relief valve leak
The PRV is a safety valve designed to release pressure if the system over-builds. The seal degrades over time, especially on outdoor units, and starts dripping continuously. Straightforward part replacement, no need to touch the rest of the unit.
Typical cost range: $$$ · On-site time: 30–45 minutes
Internal pipe joint leak
Threaded joints inside the unit can loosen over years of thermal cycling. Usually a re-seal or fitting replacement, sometimes both. Requires the unit to be opened and properly pressure-tested before sign-off — not a quick fix, but well within repair territory.
Typical cost range: $$$ · On-site time: 1–2 hours
Heat exchanger leak
The heat exchanger is the heart of the unit and is not field-repairable. A pinhole leak means corrosion has already worked through the copper, and a new exchanger costs nearly as much as a new heater. Honest answer: replace the unit.
Typical cost range: $$$ · On-site time: 2–3 hours including removal
Condensation (not a leak)
Surprisingly common. Humid Singapore air meeting cold inlet pipes produces water droplets that look identical to a leak. We confirm with a dry-and-wait test on-site — no parts, no charges beyond the inspection. We will tell you honestly that there is nothing to fix.
Typical cost range: Inspection only · On-site time: 20–30 minutes
Age of the Unit Matters
Under 5 years
Repair almost always. The unit has years of life left and replacement is rarely the right spend.
5 – 10 years
Decision point. Repair if the fault is a single component. Consider replacement if the unit has had repeat issues.
Over 10 years
Replacement is usually smarter. The next fault is rarely far behind, and newer units cost less to run.
Water leaking from Gas Heater at River Isles
The customer reported rust stains running down the service yard wall and water pooling near the base of the unit after heavy rain.
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Water leaking from your gas heater?
Small leaks turn into bigger problems. Get an LGSW-trained technician on-site to find the source.
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Gas Water Heater Leaking Water – FAQ
Learn the common causes behind gas water heater water leakage, warning signs to watch for, and when proper inspection, repair, or replacement may be necessary.
Why is my gas water heater leaking water?
Water leakage may happen due to corroded internal components, damaged heat exchangers, loose pipe connections, worn seals, cracked fittings, or aging heater parts.
Is a leaking gas heater dangerous?
Yes. Water leakage may affect internal electrical components, damage nearby surfaces, increase corrosion, and lead to unsafe heater operation if left unattended.
Can a leaking heat exchanger cause heater failure?
Yes. A leaking or corroded heat exchanger may reduce heating performance, trigger error codes, damage internal components, and eventually stop the heater from operating properly.
Why does water leak only when the heater is operating?
Some leaks become visible only during operation due to pressure build-up, heating expansion, or cracks that open when hot water flows through the system.
Can old gas heaters start leaking after many years?
Yes. Older gas heaters may develop corrosion, weakened joints, rusted components, or internal deterioration after long-term usage.
Should I continue using a leaking gas heater?
Continued operation is not recommended until proper inspection is carried out, as leaks may worsen and cause further internal damage or safety concerns.
Should a leaking gas heater be repaired or replaced?
It depends on the source and severity of the leak. Major corrosion, heat exchanger leakage, or repeated leaking problems often make replacement more practical.
Who should inspect a leaking gas water heater?
Gas heater inspections should be carried out by trained technicians under Licensed Gas Service Worker (LGSW) supervision to ensure proper diagnosis and safe operation.