I am currently heating DHW with a coil in a 1957 oil furnace that used ~150 gallons over the past 6 summer months, or about .83 gallons/day @ $3.59/gallon = $3/day = $90/month. In the winter I used just a tiny bit more as the wood stove provides nearly all the heat. I've only lived here a year and knew this was an inefficient way to heat water, but now that I'm doing the math, it's looking downright awful. Based on all the info in this thread, I should look into a separate hot water heater. It's only me and the missus and we're pretty frugal in our hot water usage. Just upgraded from an insert to a freestanding stove so I hope to heat exclusively with wood this year. No natural gas here, and I plan to do a gasifier setup in the next 3-5 years as part of a more major house renovation. I can get a $500 rebate from my utility company for a heat pump water heater and was scoping out the GE GeoSpring, currently on sale for $999. With a %10 off coupon at Lowes and the $500 rebate, it sounds about equal price wise with a regular electric unit. I read some old threads and it sounds like the few that have this HWH have been happy. Any other recommendations?