Can I unplug electric waterheater to save $
We have a weekend cottage with a small 5 gallon electric water heater that is I think 1800 watts. If we won't be there for a while I unplug it to save energy. There is a tap on the bottom to drain it Should I drain the water out as well? Will it do any harm to sit there unplugged but full of (cold) water until we need it the next time? Would draining it make it last longer or not? It's about 15 years old and has a few surface rust stains showing.:confused: