Question

The expansion tank in an old-fashioned hot water heating system is open to the atmosphere, and is located 10 m above a pressure gauge on the furnace. What is the reading on the pressure gauge attached to the furnace?

Answer 1

Answer:

Expansion tanks work by equalizing pressure throughout the system. ... As hot water enters the heating system, the pressure in the system increases. As pressure increases, the diaphragm in the expansion tank is pushed down. This compresses the air in the tank, creating more space for excess water to enter.