520 firing rate...

I have a question regarding the firing rate on the 520...the efm site lists firing rate as 2 1/2 to 25 lbs. of coal per hour...is that correct? 60lbs. a day seems like a lot in the spring/fall shoulder seasons, or just making domestic hot water.....

Ahhh, thats where the timer comes in Right?

Yes that's 2 1/2 lbs running nonstop or 25lbs running nonstop. Per hour. During a call for heat until the call is satisfied. Then the timer runs unit for 3 minutes per 1/2 hour or 3 minutes per 1 hour. Your standby rate can range from 6 lbs per day to 60 lbs per day at ten teeth. Scott

It will actually be a bit more than that on standby, remember any domestic hot water will pull the boiler temp down and so will standby heat loss anytime the outside air is less than the boiler water. Overall it won't use much in the summer, mine uses 15-20 pounds a day heating all my water and the heat comes on at night sometimes. I could get it tuned to use less in the summer but it takes a lot of fine tuning to save what amounts to little and then having to reset it during the fall and then again in the winter vs doing nothing and buying an extra 1/2 ton of coal for the year.