What do Killer Whales Eat? Killer whales are carnivore marine mammals, so their diet is full of meat gotten by hunting several species in their habitat. Since there are several ecotypes of killer whales, their eating habits are closely linked to the geographical area where they are located and with their population.
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.
At 40 to 45 BTUs per square foot, you'd need a 100,000 to 112,500 BTU furnace to heat your 2,500-square-foot home. A heating degree-day calculation, using the month of July as a factor, is a more precise way of estimating furnace size. Natural gas for a furnace is priced by the therm, or per 100,000 BTUs. Therms are listed on your home's gas bill in annual and monthly usage rates. The heating degree-day calculation for a furnace is 50 x heating therms x furnace efficiency = load in BTUs/hour.