An explosion could occur.
Its a Boiler that is fitted with two or more heating sources. Say Gas and Oil Fired
Oil is a carbon-rich substance, and by burning it, we release a lot of carbon dioxide into the atmosphere. Carbon Dioxide is a greenhouse gas, so this can increase the Greenhouse Effect, which is linked to global warming.
Electric boilers require approximately 3 1/2 kilowatts per boiler horsepower. Fuel oil typically produces approximately 3.5 boiler horsepower per gallon of oil burned*. *This depends on several factors in boiler design, furnace design and fuel heat content.
oil
Burning fuel, which may be coal, wood, fuel oil, etc.
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.
Brown smoke comes from burning fossil fuel, usually fuel oil.
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 .
fuel oil for a boiler and off road diesel is usually died red. diesel in my area has a yellow tint, I've heard of other shades in other parts of the country
by burning fuel and small quantities of oil
There are many variations of measurement in the oil industry "boiler fuel" could be many things This link will give every possible conversion you are looking for http://www.eppo.go.th/ref/UNIT-OIL.html
Natural gas (methane (CH4)) is the cleanest burning fuel, emitting the smallest amount of carbon dioxide of all the fossil fuels (coal, oil and natural gas).