Lightning wrote:Larry, what about the extra wear and tear on the coal appliance. You don't think it has any impact?
There would be extra wear and tear to all of the moving parts and electronic switches, but I can't quantify the degree of it. The boiler doesn't fire much during the summer months. Based on its rated 24 hour input BTU's I figure our boiler eats 0.1667 lbs. of coal for each minute it is firing. And if it eats only 11 lbs per day at pure idle fire (assuming no fan run time, and no DHW used for that day) it is burning about 0.008 lbs. per minute of idling.
If we are burning 15 lbs per day of coal in the summer (as we are) that would require about 4/.1667 = 24 minutes of total firing (fan running time), and the rest of the time merely loping along.
1,440 minutes = 1 day
24 minutes x 0.1667 lbs./minute when firing = 4 lbs of coal burned
1,416 minutes of idling x 0.008 lbs./minute of idle = ~11 lbs. of coal burned
Total = 15 lbs. burned per day
And where does 0.1667 lbs. of coal burned per minute of firing come from:
If the stove was at high fire (meaning the fan is running) for an entire hour: 60 minutes x 0.1667 lbs./minute = 10 lbs.
10 lbs. per hour burned x 13,000 gross BTU's/lb. = 130,000 gross BTU's per hour. And this is the gross BTU input rating of the S-130 Coal Gun