After spending the winter 2013-14 experiencing constant water and condensation issues, treating the heater like a wood stove during the coldest parts of the winter and having (sometimes dangerous) problems running it while the winds were gusting, I spent the month of August rebuilding the RMH in the sunroom. The core itself worked fine with the difficulties stemming from the incomplete bench (not enough mass), a flat and badly settled ducting pipe (causing pooling of condensation) and the "stack effect" exacerbated by essentially living in a plastic bubble. This video shows the RMH with the new bench - at least 5 times as much mass with the ducting set at an angle to drain condensation out to a seepage area. We also doubled the height of the external exhaust stack and added an "H" type crown to help improve function in wind. Currently, the interior manifold temp ranges from 120-140*F, the "bump" beside the door you see in the video is just starting to heat up at 65*F, and the inside wall of the duck house is so far about 55*F, keeping it warm enough that their water has not yet frozen. We're currently running it up to 8 hours a day as we warm the mass and have kept the sunroom temperatures well above freezing during single digit weather without it running. So far, this has been a BIG improvement over last year's so-so function.