On Feb 12, 5:18*pm, John Phillips
wrote:

Having a pump that runs the CH system properly at its lowest setting is
probably a good idea to reduce pump noise.

However, for small systems a pump capable of 5m dynamic head, even on
its lowest (fixed) setting, may result in too fast a flow which means
noise from the pipes.


I had a 5m one in my 2 bed flat, on the second setting and it was fine
but it was a pressurised system and they tend to run quieter.