Geyser Family Use

Geyser Electricity Consumption Test

A data logging meter was attached to a 200 litre geyser in a normal family home.  It recorded the electricity used over four days.  The results are shown graphically below.

Geyser Electricity Consumption Test - Day 1
Geyser Electricity Consumption Test – Day 1

The graph above shows the way a geyser uses electricity.  The unit tested was a Kwikot Dual 600 (200 litres with a 4kW heating element). The geyser supplied hot water to the main bathroom of a family of 4 (two adults and two children).  All four used that bathroom during this test.  The thermostat was set to about 55C.

Its easier to understand the data if each day is considered separately:

Geyser Electricity Consumption Test - Day 2
Geyser Electricity Consumption Test – Day 2
  • The family ablution routine is to shower/bath etc in the morning after waking up and again before retiring in the evening.
  • There is also some hot water used during the day.
  • The geyser tested seems to be quite well insulated because there are very few obvious instances of the thermostat switching on to reheat water.
Geyser Electricity Consumption Test - Day 3
Geyser Electricity Consumption Test – Day 3
Geyser Electricity Consumption Test - Day 4
Geyser Electricity Consumption Test – Day 4
  • On Wednesday the bath was used to soak/wash clothes at about 09:00.
  • One can see how much more electricity is consumed by running a large bath as opposed to showering at about 20:00.

The summary figures for the test are:

Max. Power drawn  3836W
Average energy used per day  9.24kWh
Total energy consumed in 4 days  36.97kWh

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