Here is where I spent the last 2 days. The crawlspace was tight with almost no room to maneuver but the plastic that the homeowner had laid down was much appreciated. I was under the house to replace all of the undersized gas lines with new Trac pipe. While under there, I also replaced a small amount of the water lines.
After the new gas lines were installed, a new Rinnai 9.4 tankless water heater was installed. No pictures of the new water heater, sorry. I’ll get some on the next install.