Hi all, I bought my first house earlier this year and am going through an extensive remodeling process. One of the upgrades was a dual heating system with a Goodman gas furnace and a Woodchuck 2900 wood furnace, both which were purchased new. I chose the Woodchuck because my parents have had a model 526 for over 25 years and have never had a problem with it. My house is about 2200 sq ft so I chose the model 2900 for its larger heating capacity, plus I liked the shaker grates and secondary heat exchanger. Here's the issue: My plumbing/heating contractor handled the installation and duct work and as soon as he looked at this furnace he's been all wound up about the secondary heat exchanger design. Anyone who is familiar with this model should know what it looks like. The opening for the heat exchanger pipe sits directly over the fire box, makes a 90 degree bend, then goes straight out the back of the furnace where the smoke pipe connects. He seems to think all the heat from the fire is going to funnel right out that pipe and up the chimney and has warned me several times I'm going to have fire going through and up the chimney as well. He's even shown it to several of the other contractors I have working as if it's some kind of novelty and they have jumped on the bandwagon too. Basically in their eyes this thing is going to be like a blow torch and is a chimney fire just waiting to happen. I've called the factory and talked to them and they assured me this isn't the case, but still I'm a little rattled by their taunting. Basically I'm wondering if anyone has experience with this model and can share what they know? How hot does the flue get, are they as efficient as the company claims, etc.? One other thing...I installed all new Supervent 8" insulated pipe on the outside of the house with an insulated chase, so I should pull a good draft. The plumber handled this as well, but I'm not happy with the job he did. He set the "T" in cement, so the only way I can clean it out is by removing the pipe inside and raking the soot out through the opening in the basement wall. There isn't much room in the basement so in order to connect to the chimney I'm going to have to run two 90 degree elbows with a short section, maybe 2 feet of pipe between. Any problems with this setup? And does double wall insulated stainless pipe typically last a lifetime? I'm a little concerned with his choice of pouring cement around the T if it ever needs replacement.