Induction Hob

We decided to conduct a quick test to see how efficient an induction hob was in comparison to a conventional electric stove/hob.

water_measureThe test was very simple.  We measured out and boiled exactly one litre of water, using the same pot on each type of stove.  We measured the power consumption of each, as well as the time taken for the water to boil.  We then multiplied the average power consumption by the time taken to boil, to get the energy consumed and then compared the values to determine the efficiency (or not) of the induction hob.

In both cases the water was taken directly from the cold water tap, within a few minutes of each other,  and the pot, water and stove started at the same normal room temperature each time.

Conventional Electric Stove

pot_on_stoveWe measured out exactly 1 litre and poured that into the pot on the stove.  The stove plate was switched on to full power, and the stop watch was simultaneously started.

In the meanwhile a clamp meter, that could measure power, was attached onto the stove wire in the DB board, to monitor the power consumed .  The initial power reading was 1.43kW.

stove_reading1We waited for the water to boil.

As the water got close to boiling we re-checked the power and noticed that the reading had dropped down to a lower value of 1.358kW.

stove_reading2We judged the water to be boiling when the surface just started to become violently agitated.

stove_timeThe time taken to boil was  7 minutes 23.46 seconds.  In decimal format that is 7.391 minutes, which in turn is 0.1232 hours.

So using the average of the two power readings, which is 1.394kW, we get an energy consumption of 0.1717kWh, for the conventional stove to boil one litre of water  (by multiplying the average power consumption by the time).

Induction Hob

The pot was cooled down by emptying it, and then allowing cold tap water to flow over it until it was completely cold to the touch.  It was then dried and allowed to stand for a few minutes, to ensure that it was definitely back to room temperature.

inductionpot
We then measured out exactly 1 litre of cold tap water, poured that into the pot and put that onto the induction hob.   The hob was switched on and the stop watch was simultaneously started.  The hob was dialed rapidly up to full power.

Its always amazing to see the bubbles form in the water almost immediately!

In the meanwhile we had reattached our power meter to a cable supplying power to the hob.  The initial reading was 1.419kW.

induction_reading1

 We waited for the water to boil and took another power reading when we could see the water was close to boiling, as before.

induction_reading2

 The second reading wasn’t that different in this case.

When the surface of the water just started to become violently agitated (we actually waited a second or two to be sure), we stopped the stop watch.

induction_timeThe time taken was 4 minutes and 52.82 seconds which is 4.8803 minutes, which is 0.0813 hours.

The average of the two power readings was 1.423kW, which yields an energy consumption by the induction hob of 0.1157kWh to boil one litre of water.

Results

So according to this test, the conventional stove used 0.1717kWh to boil one litre of water while the induction hob used 0.1157kWh to boil the same amount of water in the same pot.  That represents a saving in energy of 33%!

19 Comments

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