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[MattyNH]

They aren't smoke free..But they don't spew as much smoke as the old style OWB..I drive by a e -classic all the time..As far as the you tube video...Of course it burns clean its a factory video..perfect situation..

[TheBoiler]

I had not watched the video, if it is approaching 100% efficiency why does it not have a plastic chimney? My gas boiler does.

And to get that high it must condense?

[RSI]

They said combustion efficiency. It is not transferring a lot of it into the water. That is also only when it is in the middle of a cycle.

[Dean186]

I had not watched the video, if it is approaching 100% efficiency why does it not have a plastic chimney? My gas boiler does.

And to get that high it must condense?

I am not sure if your question is serious.  If it is, then:

1)  They are 80-90 percent efficient not 100 percent.

2)  One has to open the bypass door when adding wood, which makes them operate like a standard fireplace during that time and flames sometimes can be seen exiting the chimney.

3)  The season start-up process requires kindling to be burnt with the bypass door open to create a coal bed.  Again, flames coming up through the chimney.

4)  Even though they are efficient - during high burn mode the temperature going through the heat exchanger may be 1400 degrees Fahrenheit and not all of that energy, in the form of hot gasses, is scrubbed off by the heat exchanger.   

[dirtryder]

I had not watched the video, if it is approaching 100% efficiency why does it not have a plastic chimney? My gas boiler does.

And to get that high it must condense?

I am not sure if your question is serious.  If it is, then:

1)  They are 80-90 percent efficient not 100 percent.

2)  One has to open the bypass door when adding wood, which makes them operate like a standard fireplace during that time and flames sometimes can be seen exiting the chimney.

3)  The season start-up process requires kindling to be burnt with the bypass door open to create a coal bed.  Again, flames coming up through the chimney.

4)  Even though they are efficient - during high burn mode the temperature going through the heat exchanger may be 1400 degrees Fahrenheit and not all of that energy, in the form of hot gasses, is scrubbed off by the heat exchanger.

My guess is The Boiler is from another site that is here to just bust b@lls..........but what do I know