In article ,
"Geronimo W. Christ Esq" writes:
wrote:

My room stat controls the pump only and the boiler is controlled by
it's own stat. If the boiler stat has shut off the boiler and the room
stat is calling for heat the pump continues to run.

So the pump stops allowing the boiler to heat really quickly and then
shut itself off ? That sounds very dodgy indeed.

Depends on the boiler's water content, and this was the norm
with higher water content boilers.

--
Andrew Gabriel