Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Finally comfort in small cape cod
with single pipe steam. In second season in this house after leaving comfort of Richardson System in vacuum at prior house(switched t-stat from old round h-well merc to round h-well set to hot water setting which provided steady comfort). Orig t-stat was old rectangular honeywell merc, tried two other mechanicals, the Robertshaw(now Invensis) 986-1R and the White-Rodgers 1E30N-910 with similar results, temp swings of 4 degrees, and few minutes of some vents hissing, with boier pressure occasionally reaching 16-20 oz and bringing p-trol into play for shut-down. so I swapped out to W-R(Emerson) 1E78-140 heat only. What a difference; have t-stat set at 71 and never moves! Boiler cycles for7-10 min, and because house is so small, EDR of 218, rads never get cool, steam never gets to air vents(no hissing on very cold temps out-side) and pressure is between 1-4 oz, t-stat always turns off boiler.