How to Replace a Geyser Element: DIY vs. Plumber Guide
24 May 2026 · Plumbers On Duty
Quick answer
Replacing a geyser element is technically DIY-friendly — drain the geyser, isolate the power, unscrew the old element, fit the new one with a new gasket, refill, restore power. Total time: about an hour. Parts cost: R150–R400.
But if you've never done it: a plumber charges R1,200–R2,200 all-in and that includes the element, gasket, anode rod check, and refill. Often worth it.
Signs your element is gone
- Water lukewarm but not hot
- Tank takes far longer than usual to heat
- Geyser tripping the DB earth-leakage (element earth fault)
- No hot water at all (and the thermostat tests OK)
A plumber can test the element with a multimeter in 5 minutes:
- Healthy 3kW element: about 18 ohms resistance, no continuity to earth
- Burnt out: infinite resistance (open circuit)
- Earth fault: continuity from element terminals to the geyser body
What you'll need
- Replacement element (match your model — usually 3kW Incoloy 800 or copper)
- New rubber gasket (always replace, never reuse)
- Element spanner (special hex socket; R150 from a plumbing merchant)
- Multimeter (to test the new element before fitting)
- Garden hose (to drain the geyser)
- Ladder
Step-by-step
- Switch the geyser OFF at the DB. Lock or tape the breaker so nobody flips it. Wait 30 minutes for water to cool.
- Close the cold-water inlet valve above the geyser.
- Open a hot tap in the house — this lets air in so the geyser can drain.
- Attach a hose to the drain valve and run it outside or to a drain.
- Open the drain valve. A 150L geyser takes 15–25 minutes to drain.
- Remove the electrical cover and disconnect the element wires (note which goes where).
- Unscrew the old element with the element spanner.
- Slide the old element out carefully — it may be heavy with scale.
- Inspect the anode rod while you're in there — if it's eaten down to a thin core, replace it (R150–R300).
- Clean the gasket seat in the geyser flange.
- Fit the new gasket, slide the new element in, hand-tighten then snug up with the spanner (do NOT over-torque — you'll crush the gasket).
- Reconnect the wires exactly as before.
- Close the drain valve, open the cold inlet, leave a hot tap open until water flows steadily (air bled out).
- Refit the electrical cover.
- Switch the geyser back on at the DB. Listen for the element clicking on. Check for leaks after 30 minutes and again after 2 hours.
The 4 things that catch DIYers out
- Stripped element threads when over-tightening. The geyser flange is then ruined and you need a new geyser.
- Switching on a partly empty geyser. The element burns out in seconds. ALWAYS confirm water is flowing steadily from a hot tap before powering up.
- Old element seized in place. Sometimes needs heat (gas torch) to break loose — risky.
- Wrong gasket. Wrong thickness causes a slow drip into the ceiling that you only notice weeks later.
When to definitely call a plumber
- Geyser more than 8 years old (likely needs replacement anyway)
- Visible corrosion around the element flange
- You don't have a clear way to switch off and verify the power is off
- You rent (it's the landlord's job)
Cost summary
| Route | Total cost |
|---|---|
| DIY (parts only) | R250–R500 |
| Plumber call-out + element | R1,200–R2,200 |
| Plumber after-hours | R1,800–R3,000 |
| Full geyser replacement (if it's old) | R7,500–R14,000 |