Got a ef3 and had it installed. What im reading is they should of used a megaholic guage at time of install,and they didn't. Im not sure if it because of that or it's just me but im having a hard time finding a good setting for my damper. I have been using 3 on dial a fire. my flame seems very very small. the heat output seems ok,yet i have nothing to compare it to. If need be i will find a indi tech to adjust the stove if you guys think it would be a good idea. If im going to go with pellet for main source of heat i want to do it right, im kind of anal that way