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Shaver Furnace / 165....not enough heat in cold weather----Vermont

« on: June 05, 2010, 03:36:23 PM »

I live in Vermont and have a Shaver 165. When the temp dips below 10 degrees (of which is more than a month) my house temp goes to mid 60's (termostat is set on 70, house was new in 2005, 1200 square feet). ON installing the furnace there was some growing pains. It was installed by a plumber working for a Shaver dealer. The furnace was set at ground level, pipe was put under the earth 5', so there was a rise of 15' to the heat exchanger. This rise supposedly resulted in 'air' in the lines and had to be purged every 10 days....this was a problem. The plumber then relocated the pump to the bottom of the furnace, of which got rid of the 'air' problem. But because I take the water from the bottom of the furnace, it is not the warmest part (it is actually in oppsite). Has anyone else experienced not enough heat? Or had to move the circulator to the bottom of the furnace? Should I re-insulate the furnace becasue of where I live?
I spoke with a rep from shaver furnace and he suggests that I go to the next size up in pumps because of the "rise" to my heat exchanger. I'm not sure if this will work as it is feeding a 1" pex pipe line and it would seem that I would have to increase the size of the line also to increase the BTU's. I did notice that thedoor is NOT insulated and the top insulation is "flat" from steam. I believe that the top insulation is probably not working at all because of this (?). Should I go to a foam panel or spray foam for the top? Any ideas??