Looking for some input. My house uses a 40 gallon indirect water heater heated by an oil boiler. It's a well insulated water heater. I've kept track of oil consumption over the past 3 years and have noticed, on average, the indirect water heater uses roughly 25 gallons of oil a month with my household. At $3.69 a gallon, that is close to $100 a month. My states electric providr has a rebate for the installation of a hybrid energy efficient electric water heater. Combined with a $300 Federal tax credit, this would nearly pay for the entire cost of the heater. I'm looking at the GE model or Kenmore. http://www.sears.com/ge-geospring-50-gal-10-year-hybrid-electric/p-04232200000P http://www.sears.com/kenmore-elite-60-gal-hybrid-electric-water-heater/p-04232116000P?prdNo=5&blockNo=5&blockType=G5 Both estimate electrical usage of roughly 1900KWH. Does anyone know how Energy Star comes up with these values? How do they determine the household size and pair with the size (gallons) of water heater. Our electric services has been slowly increaseing from $.14/kw to not $.157/kw in the last 2 years. At that cost, these new hybrid heaters should only cost $30-$40/month and even if it's consumption was 7,000kwh annually, it would still be less than what it costs me now to heat with oil.