New energy star models are about 470 kWh per year.
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It depends on the fridge. Newer fridges are generally more efficient, so would use less electricity, although size is a definite factor. There should be sufficient information on the fridge to determine watts, though you may have to calculate. Watts = amps x volts. Volts = 120. I'd use 120 to avoid underestimating. In any case, running a fridge only for beer is an avoidable cost unless you make better use of it. Replacing an old fridge and a separate freezer with a newer'' more efficient fridge with useable freezer space probably uses less electricity than 2 older appliances.
Electric lights that use from 0.02 watts to 50,000 watts have been manufactured. The CFLs, fluorescent tubes, and incandescent bulbs in your house probably operate in the range of 20-100 watts.
To obtain amps from watts a voltage must be given.
"Watt" is a rate of moving energy. The more watts you use, the faster the waterwill heat up. The fewer watts you use, the slower it will heat. If you can affordthe time to wait, then any amount of power will do the job, no matter how small.
If this question is about electrical home heating then use ten watts per square foot.