Rocket powered thermal mass explained! I was able to borrow a thermal imaging device from my day job to show you all just how awesome this mass is at retaining heat. The weather has been relentlessly cold here in Ohio, and on work days I have been running the stove about 3 hours per evening. This keeps us around 40 after 24 hours, not ideal, but way better than nothing. On days I do not work, I double the time I run the stove, mind you I only do this in these times with lack of sun, below freezi