"Set Square" wrote in message
...
In an earlier contribution to this discussion,
Hugo Nebula abuse@localhost wrote:

Which is best - running a central heating pump at its fastest or
slowest speed setting?


Run it at the lowest speed which gives an adequate performance. With a
conventional boiler, this would imply an 11 degC drop across all radiators
when they are correctly balanced.

Misadvise. You run it to what the balance procedure dictates.