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Posted by HeatPro on December 03, 2008 at 13:25:14:
In Reply to: Help improving efficiency of a two loop single pipe system posted by Jeff in Groton, CT on December 03, 2008 at 08:27:03:
The vents and radiators getting warm is a function of the amount of pipe the burner has to heat up before it gets to radiators. It can take a long time to heat that much metal from a cold start. Usually, after the heating season gets to 40F or lower outside, the pipes and radiators never really get cold, so there is less heatup time.
We can't tell from here if you mean from a cold start or from a heated-before state. In either case, the main vent has to be large enough to vent the air out of the mains pronto, before the radiators get hot, but we can't see the vents from here either.
A liner added to a wet-base boiler covers more of the wet base, so there is less heat absorbed into the boiler water than into bare castings.