Water Heater Power Consumption:

To calculate your water heater power consumption and interpret the results correctly you need to know and understand the following four parameters:

  1. Wattage: It’s the RATE at which any appliance consumes power. For example a 1500 watt hair dyer consumes 1500 watt of power every hour.
  2. Operational Hours: It’s the number of hours an appliance is in operation. For example a water heater running for 30 minutes mean it’s operating hours is 0.5 hours.
  3. Electricity Tariff: It’s the amount your electricity provider charges you for one unit of electricity. I live in Nairobi, Kenya….here electricity tariff is Ksh. 10 to 15 / kWh.
  4. Unit Of Electricity (kWh): This’s the POWER CONSUMED by any device measured in units of electricity or (kWh). For example a 3000 watt water heater running for 1 hour will consumes 3000 watt X 1 hour = 3000 watt hours or 3 kWh of electricity.

Electric Instant Showers are normally rated at 7,500 to 10,500 Watts, meaning they consume 7,500 watts per hour.

An average adult takes 15 to 20 minutes in a shower. This translates to 0.25hrs. If a 7,500 Watts Electric Instant Shower is being used, this means 7,500*0.25 = 1,875 Watt Hour is being used on every single shower. This is equivalent to 1.9Kwh unit of electricity.

1 Unit of electricity for domestic use is Ksh. 10 per unit. Therefore 1.9Kwh translates to 1.9*10 = 19 bob per single shower. If there are 5 members of a family this means taking a single for the entire family will cost Ksh. 93. Lets round this to a 100 bob since kplc tarrif keep flactuating, this means that the entire family spends Ksh. 3,000 on just a single bath. In a year it’s Ksh. 36,000. This may seem “cheap” in the short run bout in long run not the case.

Solar Water Heater

On average a solar water heater will cost Ksh. 130,000 to 150,000 depending on your location including installation. This may seam “expensive” in the short run but once installed, it will save you lots of money on electricity bills. In addition, unlike electric Instant Shower, Solar Water Heater will provide hot water for other usage, e.g. kitchen use at NO addition cost. Maitenance of Solar Water Heater is way cheap compared to Electric Instant Showers. The benefits are endless.

For more equiry on Solar Water Heater feel free to contact us:

Global Systems Solutions




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