Sam, you and anyone else are certainly are entitled to put your faith in all the test results, standards and methods you can find but I see the results of people believing them and taking them at face value everyday. The fact that a given unit meets the standard means very little as far as real life operation is concerned. I would simply like to see a method that people can safely assume accurately reflects the results they will obtain. Nothing more, nothing less. The former standard as well as the current one do not. As you said yourself, the test method is based on small airtight wood stoves rather than hydronic based heating systems. I am at a loss to explain why the powers that be cannot grasp that these are completely different animals in terms of operating characteristics. Lowering the output on a wood stove to 25% simply reduces the surface temperature of the unit and the surrounding air. Lower the output of a firebox surrounded by water to 25% and you have a fearful mess on your hands. Ever look at the inside of a PhaseII gasser that spends most of it's time at outputs around 30-40% of full rating? It's ugly. All I am asking and hoping for is that the agencies involved promulgate a standard that will actually tell Joe Consumer what he can expect in his own yard. That's all anyone should want.