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.