On 27/10/2020 18:38:30, Tim Lamb wrote:
I am considering fitting an additional expansion vessel to our heating
system. Advice specifies boiler return pipe location. Why?

Probably where the boiler pressure gauge/sensor is fitted, and so would
change least under normal operation if buffered by the expansion vessel?

It might affect the firing of the boiler if it wildly fluctuated when
valves/pumps were turned on or off?

BICBW