I finally got the replacement bricks yesterday, 3/1/19. I removed the old bricks; they broke into softball sized pieces. When I tried to install the new bricks they were too big! Now I was worried. It was supposed to get down to -3F that night. I called Heatmaster and explained my situation. Colin, at HM, got right on it. He contacted the local rep and had him come and cut the bricks down to size so I could get by until the correct size bricks could be sent out. The old bricks were straight sided, the new model design flares out. They had me up and running by 5pm. Kudos to the HM team!
When I took out the bricks that form the nozzle, the round bottom chamber started to fall apart. I asked HM if they would send me those bricks with the new replacement nozzle bricks as they were as defective as the others.
Here are some picts of the removal process.
I used a 2by to push the nozzel bricks up from below.
The bricks being pushed up from below.
This is all that was left
There is insulation stuffed in outboard side of the holes. I used some rockwool in the new ones.
Notice the flared sides. The old ones were straight up from the short point.
Each side of the u-shaped combustion chamber broke out like this.