Cheap wood heat, I am far from slinging mud. I simply asked for information and made a suggestion. Why do my credentials matter? I am the prospective buyer. You are the seller. You are the one who needs to prove your credentials. If your boiler does what you say it does, I want to invest in your company!! You are still dancing around the questions. You are also losing your audience as most folks think you are not going to answer their specific questions. As far as the folks and knowledge on this web-site is concerned - Many folks here including professionals and DIY types take time to help other people in need of knowledge. Not asking for anything in return except maybe a written Thank You! I am not attacking you or your business in any way. I give you credit for jumping in this thread when the majority of posts towards your product are negative. People are expressing how they feel about your product. You took the time to post, so I assume you do care what people here think about your product. Instead of "throwing mud" lets start over. I have 2 questions: I want to know how your unit achieve efficiencies better then other outdoor units using a forced draft. You say it is proper air to mass ratio. How does the unit know what is the proper ratio and how does it adjust these ratios? I am truly interested. I have friends that build their own boilers from scratch. Even though I have a great boiler, I want to build one from scratch. I want to burn less wood. I want the satisfaction of having a highly efficient unit that I built with my own hands. So I will always be looking for ways to achieve better efficiency. If you have a way to help me in my quest I want to hear about it! Right now I am set on building a Garn style boiler. At the end of the day it is about burning the least amount of wood and reducing our carbon foot print that matters.