 What is the oldest boiler that is still in use?
The oldest kind of oil boiler you are likely to encounter had been converted from coal. Due to antiquated design, high draft loss and poor heat transfer plague these systems. The oldest systems are steam heat and gravity hot water. The gravity hot water works on the same principle as gravity warm air. The lighter hot water rises up into the radiators as the cooler heavier water falls back to the boiler. There is no circulator pumps or zone valves on gravity hot water.
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