"I very recently had an AHS 130 installed in my 4000+ square foot home which also has an additional 2400 SQFT of largely uninsulated basement and garage. It is routed through a new Weil Mclain Gold Series Oil furnace with 60 gallon DH tank (boiler currently disabled from firing by choice) and delivers heat through the existing hydronic setup in the house. My house was custom built about 17 years ago. Attic insulation is about R-50 (beefed it up this fall) and walls are 2X4 with outdoor taped inulating foam panels and Tyvek "

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