furnace efficiency

[pekos]

I need to have furnace efficiency to do an economic calculation of losses due to bad settings
I know that you can calculate the efficiency based on o2 in glue gas and flue gas temperature...
it 's a fuel oil and fuel gas furnace

 

[25362]

For a start visit

thread124-29091
thread404-100205
thread794-27310

and also the links mentioned therein.