kennyp2339
Minister of Fire
Its Friday, I'm suppose to prepare my brain for not thinking on the weekend, you gave me a headacheYes you do! I can think of two quick ways, both of which I used as checks against the other:
1. Take note of how much oil is in your tank and the date when you turn your heat off in the spring. Then gauge how much is left (plus any added) in the fall, when you turn your heat back on. Divide by the number of days between, and that's your summer daily usage for DHW. Assume your winter daily DHW usage will be at least as high, unless you take colder and shorter showers in winter.
2. Track your oil deliveries against the number of calendar and heating degree days (HDD's) between. Plot as gallons/day vs. hdd/day, and then fit a linear trendline to it. Your y-intercept (hdd/day = 0) is your daily usage for DHW. This can also be double-checked by plotting usage throughout the year and eyeballing the summer valleys.