A leaking geyser could be a simple valve fix or a sign the tank is failing. Here's how to check, what it costs, and when to call a plumber urgently.
Diagnose Your ProblemA leaking geyser doesn't always mean the tank has burst — there are several components around a geyser that can drip or leak, some of which are normal and some of which signal a serious problem. The TPR (temperature and pressure relief) valve, for example, releases a small amount of water as part of its normal operation during the heating cycle — this is by design.
However, a geyser with a cracked or corroded tank body, a weeping connection joint, or a failed pressure control valve is actively damaging your property. Water leaking inside your ceiling from a geyser can cause ceiling collapse, mould, and electrical hazards if it reaches wiring.
All geysers installed under SANS 10254 must have a drip tray with a drain pipe that routes overflow water to a visible outlet — usually above the guttering. If you see water dripping from that pipe frequently, it's time to call a plumber.
In South African homes, high municipal supply pressure without an in-line pressure-reducing valve is a major contributor to geyser stress and premature failure. If your geyser is leaking and you don't have a pressure-reducing valve, your plumber should check system pressure as part of the repair.
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Occasional dripping from the TPR discharge pipe during and after heating is considered normal — the valve is working as designed. But if it drips constantly, drips between heating cycles, or you can hear water running when the geyser should be off, this signals a valve fault or pressure problem that needs a plumber within 24 hours.
Water appearing in the drip tray or on the ceiling below the geyser is always urgent — the tank or a fitting is leaking and water is entering your ceiling space. This can cause ceiling collapse and mould within days. Call a plumber immediately.
The signs you notice at home can help determine how serious the issue is and how quickly a professional should attend.
This usually indicates:
Normal TPR valve operation — pressure release during thermal expansion is by design if brief and only during/after heating
Urgency: Medium
Recommended action:
Monitor for frequency. If dripping becomes constant or occurs between heating cycles, call a plumber to check the TPR valve and system pressure.
This usually indicates:
Faulty TPR valve that won't reseal, or over-pressure condition stressing the tank and valve — active leak requiring repair
Urgency: High
Recommended action:
Switch off the geyser at the DB board. Call a plumber today to replace the TPR valve and check system pressure before switching it back on.
This usually indicates:
Active tank leak or major fitting failure — water flooding ceiling space and causing imminent ceiling and structural damage
Urgency: Emergency
Recommended action:
Switch off the geyser and cold supply to geyser immediately. Do not switch on ceiling lights. Call an emergency plumber now to prevent ceiling collapse.
Do not attempt to tighten connections or adjust valves on a pressurised geyser yourself. Geyser components are under both water pressure and thermal stress — an incorrectly tightened fitting can crack and cause a sudden uncontrolled release of hot water. You can safely switch the geyser off at the DB board and isolate the cold supply as a precautionary measure while waiting for a plumber.
All geyser repairs and valve replacements must be carried out by a registered plumber to maintain SANS 10254 compliance. If a valve replacement is done, the plumber should update or reissue your Certificate of Compliance.
The plumber will inspect the geyser and all associated components — TPR valve, PCV, isolation valves, and connection joints — to determine the exact source of the leak. If a valve is faulty, it will be replaced like-for-like. If a connection is loose or corroded, it will be refitted with new fittings and PTFE/jointing compound.
If the leak is from the tank body itself (identified by rust streaks, wet insulation, or water seeping through the tank wall), the geyser must be replaced — a cracked or corroded tank cannot be reliably repaired. The plumber will quote for replacement and issue a new CoC after installation.
Water leaking from a geyser in your ceiling space silently soaks ceiling boards, timber rafters, and insulation. Even a slow drip can saturate a ceiling board within a few days, leading to collapse. Wet timber in a ceiling is also a perfect environment for wood-boring insects and rot fungi.
If water from a leaking geyser reaches electrical wiring in the ceiling — particularly lighting circuits — it creates a shock and fire hazard. Insurance claims for geyser-related ceiling damage are the most common home insurance claim in South Africa. Acting on early warning signs (TPR dripping, water in drip tray) prevents much larger claims.
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