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Heatmor / Heat loss

« on: January 09, 2015, 03:50:41 PM »

I have a heatmore  model 400 ,the high is set on 180 deg. The low is on 160 deg.It has been running very well for the last 6 years, even in very low temps .The last few nights it has been in the single digits  and my thermometer  on the burner has been reading between 160 and 180 ,but water going out is at 100 deg. From burner and at the heat exchanger.Does anyone have any ideas on this problem? Any info would be gratefully appreciated.