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Road to better efficiency
Single pipe system(old Sears Cape Cod set-up) parallel flow, 2 circuits front and back. Front has 31' supply pipe 11/2", and return 28' also 11/2", with 133.5 sf EDR attached rad; back has 28' supply with 2" pipe and 26.5 return with 11/2" pipe with 84 sf of rad attached. Retrurns are dry and drop at boiler. Whe I first got here about 11/2 yrs ago, both returns were vented by gorton#1's; the back vented quicker, and got to vent every run, heated better also. I changed to a Gorton#2 on front, but without much improvement, and steam rarely got to vent, two wks ago I insulated front-side, now it's about = to back. Boiler is WM SGO3, with downsized .80 nozzle, with btu rating of 114K and SF of steam 354. Much oversized I would think. Cycles run from 35-40 min, and 32oz pressure gauge reads 1oz til last several minutes when it rises to 12-16oz. P-trol is additive, set at .5 cut-in and 1lb. Thermostat is Honeywell T822D, with set point of .18(lowest), new Beckett Genysys 7505 calls for .1, but old heat control setting was .2. Functions basically the same. Any suggestions?