Your geyser has stopped producing hot water — or worse, it's leaking from the bottom. Now the question every homeowner faces: do you repair it, or replace it? The wrong call can cost you significantly, either through a costly repair on a geyser that fails again within a year, or an unnecessary replacement when a simple fix would have done the job.
Here's a practical framework to help you make the right decision — and what to expect from each option.
First: understand what's likely wrong
Most geyser failures fall into a handful of categories, each with different repair-versus-replace implications:
- Element failure — the heating element has burned out (common, straightforward to replace)
- Thermostat failure — the geyser runs but water doesn't reach the right temperature
- Pressure control valve (PCV) or temperature/pressure relief (TPR) valve failure — water drips from the relief valve pipe outside the house
- Tank corrosion and internal rust — discoloured or rust-smelling hot water; usually means the sacrificial anode has been depleted
- Tank rupture or seam failure — active leak from the body of the geyser itself
Important: A leaking TPR valve doesn't always mean the geyser needs replacing — it may simply be doing its job by relieving excess pressure. Have a plumber assess before assuming the worst.
Repair vs. replace: the decision framework
✅ Lean towards repair when…
- The geyser is under 8 years old
- The fault is an element, thermostat, or valve (not the tank)
- The repair cost is less than 40% of a replacement
- The tank shows no signs of corrosion or rust
- Hot water was previously consistent and adequate
⚠️ Lean towards replacement when…
- The geyser is 10+ years old
- The tank itself is leaking (cannot be repaired)
- Hot water has an orange or rust tinge
- This is the second or third failure in two years
- You want to upgrade to a heat pump or solar geyser
Cost comparison
The table below gives typical cost ranges for common geyser interventions in Gauteng. Prices vary by geyser size, brand, and access difficulty.
| Intervention | Typical Cost | Lifespan Impact | Verdict |
|---|---|---|---|
| Element replacement | R800 – R1,500 | 3–5 years if tank is sound | Repair |
| Thermostat replacement | R600 – R1,200 | Several years | Repair |
| TPR or PCV valve replacement | R500 – R900 | Long-term if tank is sound | Repair |
| Full geyser replacement (150L) | R6,000 – R10,000 | 8–12 years | Replace |
| Heat pump upgrade | R18,000 – R28,000 | 15+ years, ~60% energy saving | Replace (upgrade) |
The age rule
Most traditional electric storage geysers in South Africa have a realistic lifespan of 8–12 years with proper maintenance (including anode rod replacement every 3–5 years). After the 10-year mark, even a successful repair is likely to be followed by another failure within 1–2 years as other components reach end-of-life.
Our rule of thumb: if the repair cost exceeds 40% of the replacement cost and the geyser is over 8 years old, replacement is the better long-term investment.
Is now the time to upgrade to a heat pump?
If you're already replacing a geyser, it's worth considering a heat pump or solar geyser at the same time. Replacing a failed geyser with another standard electric unit is the cheapest option upfront — but in Eskom's pricing environment, a heat pump typically pays for the price difference within 3–4 years through electricity savings. The installation disruption is the same whether you install a standard geyser or a heat pump.
Never attempt a DIY geyser repair. Geysers operate under mains pressure with high-temperature water. In South Africa, all geyser installations and replacements must comply with SANS 10254 and be signed off by a licensed plumber. An uncertified repair can void your home insurance.