I'm sitting here this morning dreaming up yet another new way to calculate my AHS S130 boilers coal consumption. My two initial assumptions are that it consumes coal at the the following rates:

Assumption 1) At idle the S130 consumes 0.01 lbs. of coal per minute, or 0.60 lbs. per hour.

Assumption 2) When the fan is on and the S130 is firing it consumes 0.18 lbs. of coal per minute, or 10.8 lbs. per hour.

If a timer could record and feed back both the accumulated daily minutes for which the fan is at idle (not running), and the daily minutes for which the fan is running, the daily lbs. of coal consumed should be able to be calculated to some nominal level of precision based upon this feedback.

Is there a digital timer available that could be placed into the fan circuit and which would record and store both of the cumulative idle and firing times?