Quote:
Originally Posted by thinkxingu
$.17 is only the cost of electricity—don't forget to add delivery charges.
I'd wrap your electric water heater and just keep it on. Given how little water you're using, I just don't see it making much difference turning it on for an hour to bring it up to temp from whatever it falls to the other 23 hours and keeping it at one temp—essentially, like the equation of keeping a house at one temp vs. dropping it and having to catch up later. The only difference is that a well-insulated water heater will lose very little heat.
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The heat loss in the winter time will most likely be toward the space heating of the house anyways.
The benefit of the tank would be that a smaller unit can be easily plumbed into the space as all the connections already exist.
Roughly a gallon per day for a tankless *coil* oil boiler to heat water for domestic use is about right. Being a one person household and restricted use... she may get down to about 300 gallons annually with the average efficiency in the boiler.
The wood heat... if longer term is going to be used, the electric with either a smaller tank... or a federally-subsidized hybrid would make the better choice.
Capital expenditure up front will need time for either of those to see a pay off.