The door gaskets do not last long. I usually keep two of the correct diameter and length as well as two of the high-temperature adhesive tubes. The recommended procedure for replacing gaskets is on YouTube, but is basically to put the gasket in water before putting adhesive on the slot in the door and putting the gasket in. The adhesive is silicone silicate and is water soluble so a moist, but not too wet gasket will wick up the adhesive. You need to let the gasket dry, but close the door, but not full tightness. Then within 30 days you need to fire up the fireplace to fuse the adhesive, again do not close to full tightness.
I run my stove over half of the year so I have to replace the gasket every year. Reduced use will not need replacement as often.
At the roof line the temps are not so high and a high-temp silicone is good for weather sealing.
You will need to dump ashes after every week or so of use. There will be hot embers. I have a 3-gallon metal bucket and I put ashes and embers in that, pour water on it and leave it outside for a week, then I empty ashes in the snow-filled ditch and cover with more snow before emptying new ashes. You can put ashes in the garden if you don’t burn plastics.
We more than likely won’t use it a lot, unless we get a lot of inflation hitting our electric bill. Even with the fireplace we have it was always close to 80s.
We actually have fans/blowers that were built into our fireplace. The insert will help with the more complete burn as well as allow a longer time between loading the wood into the fireplace.
Thanks for all the hints. I’ll print them for hubby. I know he’s done a lot of research, but he can double check to see if there’s anything he might have missed.