Please help sizing Mills oil boiler?

JohnNY

Hi,I'm trying to find the square foot/steam output of an old Mills "20" boiler, with a Carlin 102CRD burner and a 12 gpm tankless coil. Any help would be greatly appreciated.

Steamhead

According to the Hydronic Rating Handbook

the 20 Smith-Mills series boilers have the following capacities:



4-section: 415 EDR

5-section: 575  

6-section: 740

7-section: 905