How much oil to heat water??


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Old 11-03-05, 10:05 AM
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How much oil to heat water??

I have an old Crane Sunnyday 15 oil furnace with integral water heating coil for the household use. Based on my oil consumption during the Summer months, when the burner does not operate to heat the hot water cast iron baseboard radiators, I'm using ~1.25 gal/day to heat the water. I am the only one in the house, take one shower/day and wash a few dishes. I use the dishwasher for most stuff and run that every four or five days. I wash clothes at about the same rate using a warm-warm wash/rinse combination.

Based on last year's numbers my oil consumption for hot water alone was 43% of the total oil used. I live ~25 miles north of NYC and last year we had 5773 HDD. My coil is set for 160 degrees, assume some scale.

Is it reasonable to use that amount of oil to heat water for one person? How much of that oil is used to maintain the water at that temperature? That is, if the house were unoccupied and no hot water was being used, how much of that oil was burned to maintain temperature?

Any help you could provide in answering these questions would be greatly appreciated.

Thanks much,

Gary
 
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Old 11-03-05, 06:54 PM
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Oil for H/W

Presuming $2.50/gallon, that amounts to $3.125/day for hot water. This figure sounds high but could you do it for less with a gas or electric water heater? If you are going to be in the house long term, I suggest replacing the boiler & installing an indirect water heater.
 
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Old 11-03-05, 07:02 PM
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I guess what I really want to know is, how much of that oil is used to heat the water I use, and how much is used to keep it hot for when I might use some later. So to speak.
 
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Old 11-03-05, 07:12 PM
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Clearer Now

The vast majority is for "stand-by". How much exactly, I can't tell you but if I had to guess , I would say probably 75% or more.
 
 

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