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Posted by Tom Stanton on March 02, 2002 at 21:03:48:
In Reply to: furnace posted by jack on March 02, 2002 at 05:08:23:
I am not exactly sure what you mean by a HP and LP furnace. If you mean HP and LP boiler... the difference is a HP boiler (steam) is one which is designed with a MAWP in excess if 15 psi. If you do mean furnace, many high pressure furnaces in scotch type boilers have corrugated construction, whereas in many LP boilers the furnaces are usually plain construction. What keeps the combustions vapors from "coming out" is the draft through the boiler. Hope this helps.