The picture is showing a reading of the flue gas coming from the BioWin260 pellet boiler I have running in my house. It has just about 900 hours of run time on it and has not been touched or cleaned at all. It has been through 200 on/off cycles as of tonight. Not too shabby in my book. I would expect that if I ran it through a cleaning cycle it might bump up a point or so but probably no more than that.
The CO2 and O2 numbers are about what I would see on a decent running fuel oil furnace and are crowding actual real world numbers for high efficiency gas. Notice the dew point of the flue gas at 115*. This is why the boiler can run exhaust temps of 180-220* and not suffer any condensation problems.
At the time this picture was taken the boiler was running at 45-50% output with a water temp of 158*.. I have never seen the efficiency numbers vary more than a couple points below to maybe a point above what the Testo is reading on the picture. Having stuck the "sniffer" in the stacks of all different kinds of wood burning equipment, numbers like this with that amount of hours on it is pretty impressive to see.
Total pellet consumption during that run time is 2.38 tons.
If you figure a ton of pellets at 16,500,000btu that tells me the boiler consumed an average of 43,633 btu per hour. It has been running since the second week in February.
Not
The CO2 and O2 numbers are about what I would see on a decent running fuel oil furnace and are crowding actual real world numbers for high efficiency gas. Notice the dew point of the flue gas at 115*. This is why the boiler can run exhaust temps of 180-220* and not suffer any condensation problems.
At the time this picture was taken the boiler was running at 45-50% output with a water temp of 158*.. I have never seen the efficiency numbers vary more than a couple points below to maybe a point above what the Testo is reading on the picture. Having stuck the "sniffer" in the stacks of all different kinds of wood burning equipment, numbers like this with that amount of hours on it is pretty impressive to see.
Total pellet consumption during that run time is 2.38 tons.
If you figure a ton of pellets at 16,500,000btu that tells me the boiler consumed an average of 43,633 btu per hour. It has been running since the second week in February.
![Not bad numbers at all Not bad numbers at all](https://www.hearth.com/talk/data/attachments/98/98516-6726df4f1d8b89c7ee0bb4e1139d9b6e.jpg)