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Posted by Heatpro on September 19, 2006 at 10:43:23:
In Reply to: Re: Answer Paragraph 1 posted by HeatPro on September 19, 2006 at 10:42:24:
A low-mass (not much water inside) boiler will flash the water in it to steam if there is not enough water flow. They are generally made to have a higher resistance to flow due to having small passages inside. This can be changed, but there isn't that much reason to do so when all you have to do is use one circulator to guarantee water running though a small unimpeded loop giving enough flow to prevent flashing - as in a primary loop from the boiler to the boiler though a small open section of heating main.