Electric Geyser Running Cost Calculator
Find out what your electric geyser costs per bath, per day and per month — and see simple ways to cut your hot water bill.
How it is calculated
Kilowatts = watts ÷ 1000. Units per day = kilowatts × hours. Cost = units × your tariff. The cost per bath assumes 30 minutes of heating per bath. Monthly values are based on 30 days.
- Use a timer switch. Set the geyser to switch on only 1–2 hours before you need hot water instead of leaving it on all day.
- Insulate the tank and pipes. A hot water tank loses heat through its walls; foam insulation on the tank and hot water pipes keeps water hot for longer.
- Lower the thermostat. Set the geyser thermostat to 50–55°C instead of the maximum — every extra degree costs more energy.
- Switch off after heating. Once the water is hot, switch the geyser off; the insulated tank keeps it warm for hours.
- Match geyser size to your need. A smaller geyser heats less water faster, which means lower running hours for the same number of baths.
Frequently Asked Questions (FAQ)
How much electricity does a geyser use?
Storage geysers usually use 1500 to 2000 watts, while instant geysers can use 3000 watts or more. The calculator includes these presets plus a custom wattage field for exact models.
How is the geyser running cost calculated?
Cost equals wattage divided by 1000 to get kilowatts, times hours the geyser is switched on per day, times your tariff per unit. A 2000 watt geyser on for 2 hours a day uses 4 units daily.
How is the cost per bath calculated?
The cost per bath assumes 30 minutes of heating per bath, which is half an hour of the geyser running. Actual cost varies with geyser size and incoming water temperature.
Which is cheaper: storage or instant geyser?
Instant geysers use more watts but only run for minutes, while storage geysers use fewer watts but stay on for hours. Enter your own numbers above to compare the daily cost of both.
Is my data uploaded?
No. All calculations run in your browser and nothing leaves your device.