I've had my Shaver 165 going about a month now with mixed results. Just did the steam fix yesterday, looks to be working good. After reading the posts here (great info!) I'm wondering if I have my heat exhanger plumbed backwards. The place I bought it from said to run the hot water in the top nipple and the return out the bottom. His reasoning is "it is most important that the nipple on the water to air heat exchanger that is closest to the fan is the cold water return to the outdoor wood furnace. the top nipple farthest away from the fan needs to be the hot water feed. this is improtant because as the cool air enters the air if hooked up this way then the bottom nipple will pre heat the air entering the water to air heat exchanger and as it exits the water to air heat exchanger the top nipple will super heat the air. if this is hooked up backwards the air entering the water to air heat exchanger will super heat the air and when it exits the water to air heat exchanger it will cool the air down." The guys on the site here say the opposite, hot in the bottom, cold out the top, which seems more logical to me. Anyone have the definitive answer? Thanks!