Posted 30 July 2011 - 04:10 PM
If you have cracks in your fire box you really have come to the end of safe usage of that heater. There are some products out there that are "suggested" for use with wood burning stoves. Specifically... a caulk which is rated at 2000 degrees F by Rutland, you will have to do your own search for it. When the fire box reaches the point where it starts cracking you are looking at other dangers, like carbon monoxide poisoning. At that point the gasses don't exhaust as the should because of other leaks in the exhaust system.
Here's the tried and true method... Get bids from contractors in your area. If you have questions about them you can call your local contractor's licensing board to check their pedigree. If you get enough bids that suggest the same treatment you will have a good idea of what you need to do.
Family and loved ones will always be a priority in my daily life. You never know when one will leave you.