I know its an old post, but the zpipe is good for snowmelt applications in your yard/lawn. Ask owners not the salesman. There are several Michigan customers that did the foam trench with. The pipe, or replaced it after a season of seeing how it performed. 127' run to HX, boiler supply 176-188, never could get higher than 168 to the HE, at 6-7 GPM. Wet, low ground, bad conditions during winter didn't help. Driving the tractor or skid steer over it was a no go.