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Posted by HeatPro on November 03, 2005 at 17:12:34:
In Reply to: How much oil to heat water?? posted by Gary on November 03, 2005 at 11:57:47:
As shower times, washing machine volumes and how you fill the sink and washer volume is not a predictable number, that is a total guess. If you accept that you would use 30 gallons of water from 45F ground temperature to 135F, then a rise of 90F for 30 gallons usage per day would be 30 x 8.33 x 90 or approximately 22,500 which would be 1/5th of what you use in oil. Clearly there is too much inefficiency there during the summer months for an UNKNOWN reason. 1/3rd of the energy might be acceptable, so you seem to have high heat losses from the boiler and/or poor heat absorption efficiency.
Heating season, however, means the boiler is up to temperature for heating the building, so the assumption that 43% was for hot water would be incorrect. I doubt your heat loss would only require you to use 3 gallons of oil per day on average unless the house is a well insulated house built after 1992 of 600 sq ft.