dog, whatever the recommendation was for insulating the runs, increase it say 20-50% and the savings will be worth it. One of the shortcomings of many hot water distribution systems is loss through inadequate insulaltion. I think I had about as good a HVAC contractor as was available and I went around adding insulaltion as too much heat was lost in distribution. I dropped the temperature of my one foot thick concrete walls in the basement by 10 degrees by adding insulation to my hot water distribution PEX on the hydronics.

[img]/forums/images/icons/smile.gif[/img] Pat [img]/forums/images/icons/smile.gif[/img]