On 8 Oct 2004 02:45:03 -0700, (Simon
Langford) wrote:

I'm still pretty sure that the boiler runs flat out (i.e. never cuts
out under its own thermostat).

Hi,

Usually the burner cuts in and out while the pump in the boiler runs
continiously, reading the gas consumption off the meter over time and
comparing it with the spec should tell if it's at max capacity.

cheers,
Pete.