On Sun, 14 Dec 2003 02:03:09 +0000, The Natural Philosopher wrote:

The boler can never fire without demand for heat if its equipped
with a thermostat. I know of none that are not.

Feed a bog standard boiler with mains and tell it it can fire if it
wants to. As it is "cold" it will fire until it's stat says it's hot
then shut down. Yes? Now have you changed the laws of physics such
that this boiler will now *never* *ever* cool below the hysteris point
of it's stat and fire again?

"Demand for heat" does not include keeping itself/small primary loop
warm/hot.

--
Cheers
Dave. pam is missing e-mail