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Boiler Summer/Winter hookup - oil consumption estimate?
Hi there guys. I bought a home this fall with an old oil boiler that supplies our heat (hot water baseboard) as well as the domestic hot water via an internal domestic coil. The aquastat is currently set to 155F/185F with the diff at 25. This has done just fine heating the house and giving us very hot water.
We've yet to use the system while not heating the home so I have been a bit nervous about how the hot water will be in the winter. With the advice of our boiler tech, and on a warm 75F day last week, I changed the aquastat to 135F/185F and kept diff to 25. The boiler fell down to around 140F and I took a shower.
Within 5 or so minutes, it went cold despite turning the shower to the hottest temp possible. Bummer! Went down to check and the boiler was burning away, but the temp didn't look to be climbing so thinking it couldn't keep up.
Once things warm up again, I'll mess around with the settings. But worst case, I feel like I need to run the boiler at 155F/185F all summer...
So to my question. How does oil consumption for a summer/winter boiler compare between the seasons if the temperature settings stay the same? Since the boiler wouldn't have any calls for heat, only domestic hot water, I'm assuming the usage would be less. But worried it might consume almost as much oil...
This past winter, we used around 100 gallons of heating oil per month.
Thank you for the help!