I live in New England and am getting ready for my first winter with chickens. I do not have an outside water source in the winter and will need to fill a bcket inside then bring it out to the coop. Are the heated water bases worth money? Do they use a lot of electricity? They sell for about $45 at Agway. The thought of changing out frozen water containers each day does not seem fun. Any other tricks of the trade for keeping water available in the winter?