On 10/5/2011 2:58 PM, Mikepier wrote:
I recently turned on the steam boilers in 2 buildings I manage. Both
are Weil McLain steam boilers (EGH-85 and EGH-95). They've been pretty
reliable, but I was just curious. What is the duty cycle for a steam
boiler? Anotherwords, are these boilers designed to run for long
periods of time? Like on an average cold day, is it common for the
boiler to be running lets say 20 minutes on, 30 minutes off?

For sure, and the way you know that a boiler was improperly sized is if
it has a low duty cycle during the coldest possible weather.