"Any boiler that's in decent working order should operate at 80 to 85 percent efficiency," he said.

The boilers operated at a pressure of 6 psi.

"Conventional boilers operate at about 180 degrees," he said.

The boilers operate with water from the utility's wholly owned Lake Springfield, which also provides drinking water for the city.

The boiler operated at 18 bar and their rated power was 2950 hp.

These boilers operate at atmospheric pressure.

The boiler operated at 160 psi.

As on any other steam ship, the boilers operated on fuel oil; usually Bunker-C.

So, regardless of what heating level we prefer for our homes, how many hours will a typical boiler actually operate per year?

In some locomotives where the boiler operated at very high pressures, the tube itself would be made of metal-reinforced toughened glass.