How Much Electricity Does a Geyser Use? (South Africa, 2026)

If your Eskom or municipal bill jumped and you cannot figure out why, your geyser is almost always the first place to look. A standard electric geyser is usually 40-60% of a typical South African home's electricity bill , more than the stove, fridge and TV combined.

Here is exactly what your geyser is costing you each month, and what you can do about it.

How many kWh does a geyser use per day?

A geyser does not run all the time. It only switches on when the thermostat detects the water has dropped below the setpoint. As a rough rule:

Geyser size	Average daily usage	Monthly kWh
100L	4-6 kWh	120-180
150L (most common)	6-9 kWh	180-270
200L	8-12 kWh	240-360
250L+	10-15 kWh	300-450

This assumes a 3 kW element, decent insulation and 2-4 people in the home.

What does that cost in rands?

Using an average municipal tariff of around R3.20 per kWh (Joburg, Cape Town and Tshwane sit in this range for 2026):

• 150L geyser, family of four: roughly R600-R850 per month just for hot water.
• 200L geyser, family of five: R770-R1,150 per month.
• 100L flat or single person: R380-R580 per month.

If you are on a stepped tariff and you blow through the cheaper block early in the month, your geyser is also pushing the rest of your usage into the expensive block , so the real cost is often higher than the table suggests.

Why your geyser uses more than you expect

Four things quietly push the bill up:

1. Temperature set too high. Every 10°C extra costs roughly 8-10% more. See our guide on what temperature to set your geyser to.
2. Old or missing geyser blanket. Heat leaks out 24/7, so the element switches back on more often.
3. Long, uninsulated hot water pipes. Especially common in older Joburg and Pretoria homes.
4. A failing element or thermostat , the geyser heats, cools, heats, cools, and never settles. This also often shows up as the geyser tripping the electricity.

How to cut your geyser bill (in order of impact)

1. Drop the thermostat to 55-60°C. Free. Saves 8-15%.
2. Fit a geyser blanket and lag the first 2m of hot pipe. R600-R900 once-off. Saves 10-20%.
3. Install a geyser timer so it only heats before showers, not all night. See how to set a geyser timer. Saves 15-25%.
4. Fix dripping hot taps immediately. A slow drip can waste 30-50L of hot water per day.
5. Consider a heat pump or solar geyser for long-term savings. We break the maths down in our heat pump vs solar geyser comparison.

When to call a plumber

If your bill suddenly jumps without any change in usage, or your geyser is constantly on, get it checked. A stuck element or failing thermostat can easily add R400-R800 to your monthly bill until it is replaced. Find a vetted plumber in your area for a quick diagnostic.

Bottom line

A 150L geyser costs the average SA family R600-R850 a month to run in 2026. Drop the temperature, add a blanket and a timer, and you can realistically pull R150-R250 off the bill in the first month , without spending much.