Geyser Valve and Overflow Repairs in Randburg
A geyser that drips from the overflow is telling you a valve has had enough. We work out which one, replace it to SANS standard, and stop the water and the worry.
Nobody notices the overflow pipe until it starts dripping. Then it drips for three weeks while everyone agrees someone should look at it. That drip is a valve doing its job badly or a valve doing its job too well, and the difference matters. It is also money: a steady overflow drip can waste hundreds of litres a month, quietly, onto your roof or down a wall. Valve diagnosis and replacement is part of our geyser repair work across Randburg.
Pressure Control Valve
The most common cause of a constantly dripping overflow. The pressure control valve on the cold feed wears out, and once it does, it dumps water past the geyser all day.
- Constant overflow drip diagnosis
- SANS-rated replacement valve
- Correct pressure rating for your geyser
- Tested under working pressure
Safety Valve & Vacuum Breakers
The temperature and pressure safety valve is the geyser's last line of defence, and vacuum breakers protect the tank when water drains back. When they spit, hiss or weep, they need attention, not a bucket.
- T&P safety valve replacement
- Vacuum breaker replacement
- Overheating checks
- Drip tray and drain inspection
PRV & Water Hammer
High municipal pressure hammers every valve in the house, and the geyser feels it first. A pressure reducing valve at the meter calms the whole system and stops the banging in the pipes.
- Whole-house PRV fitment (R1,200)
- Water hammer diagnosis
- Pressure testing
- Protects geyser and taps
Which Valve Is Dripping, and What It Means
A homeowner on the Northcliff ridge called about a damp patch on the driveway below the overflow outlet. The drip had been going for a month. Nothing was broken, exactly: the geyser heated, the taps ran. But the municipal pressure on the ridge runs high, the pressure control valve had worn through, and the overflow was quietly passing water all day, every day.
One valve, one visit. The drip stopped, and so did the slow leak on the water bill.
Your geyser has a small team of valves, each with one job. When water appears where it should not, the pattern tells you which one is asking to be replaced.
The Drip Guide: Read the Pattern
- Overflow pipe drips constantly, day and night: almost always the pressure control valve on the cold supply. It is designed to relieve excess pressure, but a worn one relieves all the time. This is the classic Randburg overflow drip.
- Overflow drips only while the geyser heats: some expansion discharge during heating is part of the design. A cupful is normal. A steady stream is not, and usually points to the pressure control valve or excessive supply pressure.
- Drip tray filling or overflowing: the tray under the geyser catches what should not be there. A filling tray means the geyser body, a fitting or a valve above it is leaking. This one deserves a prompt look, because the tray is the only thing between that water and your ceiling.
- Vacuum breaker spitting: the small mushroom-shaped fittings above the geyser protect the tank from collapsing under back-siphonage. A little spit on drain-down is normal. Continuous weeping means the breaker is done.
- Safety valve discharging with steam or very hot water: the temperature and pressure valve only opens when the geyser overheats or over-pressurises. Steam is not a maintenance note, it is a warning. Switch the geyser off at the board and call a plumber.
- Banging or knocking pipes when taps close: water hammer. High pressure and worn valves make the pipework slam. It stresses every joint in the house and it is fixable.
Randburg's Pressure Problem
Municipal pressure varies street by street across Randburg, and the ridge suburbs feel it most. On parts of Northcliff and Blackheath the static pressure runs well above what geyser valves are asked to hold elsewhere. Valves that would last a decade in a flat suburb wear out in a few years on the ridge.
The honest fix is not replacing the same valve every two years. It is a pressure reducing valve at the supply, set to a sensible working pressure, so every valve, tap and mixer in the house stops fighting the street. We fit the PRV for R1,200, and on high-pressure stands it usually pays for itself in the valves and washers it saves.
When we replace a geyser, the full valve set comes standard: drip tray, vacuum breakers, safety valve, pressure control valve and isolation valve. The prices are in our geyser replacement cost guide. But most dripping geysers do not need replacing. They need one valve, fitted properly.
Please Do Not Plug the Overflow
Every year we find an overflow pipe with a cork, a cap or a squashed hosepipe fitting on the end, installed by someone who was tired of the drip. The overflow is a relief route. Sealing it does not fix the leak, it traps the pressure the valve was trying to release, and it turns a nuisance into a genuine hazard.
The drip is information. Let it tell you which valve to replace, then replace the valve.
Serving Randburg and Surrounding Suburbs
Valve wear shows up everywhere, but high-pressure stands and older homes see it soonest. We work across:
- Fairland
- Northcliff
- Blackheath
- Linden
- Parkhurst
- Greenside
- Blairgowrie
- Randpark Ridge
Based in Fairland. We carry the common valves on the van, so most drips stop on the first visit.
Frequently Asked Questions:
Why is my geyser overflow pipe dripping all the time?
A constant drip from the overflow, day and night, is almost always a worn pressure control valve on the geyser's cold supply. It is designed to relieve excess pressure, but once the internal seat wears, it passes water continuously. Replacing the valve stops the drip. A small discharge only while the geyser heats is normal expansion.
Is a dripping geyser dangerous?
A steady overflow drip is mostly a water-wasting nuisance, not an immediate danger. The exception is the safety valve discharging steam or very hot water, which means the geyser is overheating: switch it off at the board and call a plumber. And never plug or cap the overflow pipe, it is a pressure relief route and must stay open.
What is the drip tray under my geyser for, and why is it overflowing?
The drip tray catches water that escapes from the geyser or its fittings and pipes it to the outside, protecting your ceiling. A tray that is filling means something above it is leaking: the geyser body, a fitting or a valve. It deserves a prompt inspection, because a full tray is the last warning before ceiling damage.
How much does it cost to replace a geyser valve in Randburg?
It depends on which valve and how accessible the geyser is, so we quote upfront before any work starts. Most valve replacements are a single-visit job, and we carry the common pressure control valves, safety valves and vacuum breakers on the van. A whole-house pressure reducing valve, fitted, is R1,200.
What causes banging pipes when I close a tap?
That is water hammer: a pressure shockwave slamming through the pipework when flow stops suddenly. High municipal pressure, worn valves and unsecured pipes all contribute. A pressure reducing valve set to a sensible working pressure usually calms it, and it protects the geyser and every tap in the house at the same time.
Do I need to replace the whole geyser if it is dripping?
Usually not. If the geyser body itself is leaking, replacement is the honest answer. But most drips come from the valves around the geyser, not the tank, and a single valve replacement solves it. We tell you which situation you are in before any work starts.
Why Choose Andy Plumbers for Geyser Valve Repairs?
Diagnosis Before Parts
We identify which valve is actually failing before replacing anything. You pay for the fix, not for guesswork.
Valves On The Van
Pressure control valves, safety valves and vacuum breakers are stock items for us. Most drips stop on the first visit.
SANS-Compliant Fitment
Every valve fitted to the standard your insurer and the plumbing CoC expect, with the correct pressure rating for your geyser.
We Know the Ridge
Decades of working Randburg's high-pressure stands. We fix the valve and the pressure that keeps killing it.