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Re: How much oil to heat water??


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Posted by Jack, CVMS on November 08, 2005 at 01:51:01:

In Reply to: Re: How much oil to heat water?? posted by Gary on November 04, 2005 at 12:26:34:

: I've been told that at least 75% of the oil would be used to keep the water hot in anticipation of my using some, and the rest used to heat the incoming water used to replace the hot water I've used.

If I may butt in here: What you've described in the the first half of the previous paragraph is known as standby loss. That assumes the water has already been brought up to the desired temperature (as stated in the second half of the paragraph) and you are just replacing any heat the water loses while it is sitting in the tank, waiting to be used.

So what I understand you to be saying is that you have been told that at least 75% of your oil is being used to overcome standby loss. If you are drawing hot water on a daily basis, and more than 5% of your fuel consumption is to recover from standby loss, it may be time to get a new water heater. With a modern, well-insulated water heater, standby loss should be negligible.




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