I am curious as to how much energy a heater in a tank actually uses because the heater is not on all the time.
And one would assume that a higher wattage a heater is rated at then it would heat the water quicker, and therefore use less electricity to maintain the tank at a specific temperature. Is this true?
The energy calculators online seem to assume the heater is on every minute of every hour, which is not the case. And a lot seem to work on a basis that you only use the heater 6 months of the year.
My 300W heaters seem to come on for 3 minutes with a 5-6 minute gap at the moment. Sure it would be more frequent during the frosty nights.
Has anyone calculated the energy used to heat a specific tank volume and maintain it at a certain temperature?
For instance: a 300W heater in a 200L tank heating the water to 25*C, with the room temp at 15*C.