Posted by jtown on December 28, 2000 at 05:03:25:
In Reply to: steam heat, air valve vacum ?? posted by scmr on December 27, 2000 at 20:08:15:
Vacuum is good. Most systems don't have it. The cycle will lengthen some as water is boiling and distributing steam at lower temperatures as the coal fire slowly dies. It isn't needed much with modern auto firing.