Over fire on nc 30?

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Diver1992

New Member
Jan 1, 2026
1
Northeast
Over fire? Bought a nc 30 due to the many high reviews. Everything I have seen and read is the nc30 runs hot and likes dry wood. I have dry wood and I have been running a auber thermometer for the flue and run it between 300-450 degrees. I have not been able to achieve the heat that I’ve wanted because I feel I’ve been loading e/w with only 3 pieces maybe at most. I decided to try n/s and was able to fit 5 pieces. It started off hotter and faster than I expected and I was af first happy. I achieved what I wanted as far as stt and I shut the air completely off at 400 degrees stt but the secondaries kept my flue temp climbing from 500 (which is when I
am starting to get nervous) to almost 700 and the fire was still roaring from secondaries. So I chimexed my stove and chimney and threw old ash I had to kill the fire. Everything I had is new, the stove the liner and I am worried about over firing everything. My liner is single wall insulated with aluminum casing inside an exterior masonry chimney that’s in bad shape. During the whole ordeal I noticed smoke or steam coming from inside the chimney and I have 2-3 ft of roxwool stuffed inside the damper and the top is insulated as well. So I guess my question is is my liner safe to use again or should I replace it? I plan on getting it inspected at this point
 
The stove will be fine. 700 isn’t going to harm that stove.

What do you mean by aluminum casing? What on the chimney is in bad shape? You may have cooked water out of it, but you shouldn’t have had that much water in there. You may have had a chimney fire as I’m not sure 2-3 splits are enough to warm the flue. And that is a recipe for creosote formation . I think it’s a good idea to get an inspection.
 
Is your auber a probe meter in the flue or surface temperature measurement?

I don’t even close the loading door until a fresh fire makes 500 flue gas temperatures. Then I run the flue gas temps on my auber up to 900 before cutting back the air to cruise at around 750. STT 600-800.

Class A chimney is rated for 1000 degree flue gas continuously.