Dennis, put in an F&T trap on the outlet of the heater. No check valve, no vent. That should make it work fine with a condensate tank. BTW, I happen to have a Hoffman tank and pump that had about 4 years of use. It was removed when I put in the new boiler and went to a gravity return. It works great. It's a Hoffman WC-6-20B. It has a cast iron tank. I'd take $400 obo.
Here are some comments on the Dunham Systems of this era. In 1929, Bulletin 414 describes in detail, The Dunham Return system. It utilized both a return trap and an air eliminator. It was intended to… (View Post)
Both Henry Gifford and The Steam Whisperer have written on the possibilities of downsizing steam systems. Henry Gifford focused on using inlet orifices in two-pipe radiators. He pointed out that sinc… (View Post)
Boiler pressure is a very complex subject. But, it cannot simply be reduced to "Pressure is bad." Everything that I understood from my prior experience with pressure steam went out the wind… (View Post)
I cannot answer as to what pressure is required for the perimeter heat on the lower floor of the building in order for it to operate properly. I do know that control valves used on steam systems are … (View Post)