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Posted by HeatPro on November 18, 2008 at 23:18:15:
In Reply to: Re: Shutting Off 50% of home's Radiators- Should I Reduce Size of Nozzle? posted by rbeck on November 18, 2008 at 22:17:02:
: By code you cannot reduce by more than 20%. The boiler may condense due to the amount of fireside heating surface and too low of input.
+++ Condensation can happen if the boiler fireside metal can stay below the dew point, usually less than 150F. That is very difficult to have happen in a steam boiler that must boil water at 212F. Either it makes steam and has no fireside condensation; or there is condensation because it fails to steam because the nozzle is too small.
That is the main reason a steam boiler really can't become a condensing boiler to reach AFUEs
like a condensing boiler. The AFUE test is done on a steam boiler; but only when the boiler is tested as a water boiler with average temperatures of 140F which won't happen when the boiler is steaming.
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