Over 640,000 on the average
Domestic coil in boiler better than electric water heater.
No. It won't get the temperature of the oil hot enough.
It depends on your type of boiler. If you have an older boiler it will use alot of oil if left on constantly, but the newer boilers are extremely efficient and can be left an 24/7
Too much
If you are talking about standard #2 diesel fuel oil and not motor oil and you have a #2 oil fired furnace or boiler in the home the answer is yes .
Well, it depends on the lube oil you use. The basics for determination is usually common sense, to be honest. It will also depend on how big the boiler feed pumps are too.
Yes, If it is a pressurized system, the water from the back boiler and your oil or gas fired boiler can be mixed. This can also be achieved by using a water to water plate exchanger to preheat the return water from your heating devices. If you have a forced air heating system in the house, a coil can be placed in the main trunk line of the duct work and heated by circulated water from the back boiler.
2.5 gallons
And the question is: "What is an oil fired furnace or boiler" Yes you can. But why would you with the cost of heating oil being the worst choice of energy? lc
5 cuft per hour and its measured in btus
One gallon. Perhaps the question needs re-phrased?