What is a f and e tank on central heating system?
An F and E tank is a feed and expansion tank. It supplies water to the central heating system and takes pressure out of the system if the central heating water gets too hot. There is also another tank for the hot water system for your hot taps which does exactly the same thing. The water supply for the hot tap water is seperate from the central heating water to prevent contamination from the central heating water. The expansion part of the F and E acts as a safety device.
