[GWN7]

We had one blow up back in the 80's. The owners had a new furnace installed and the installer forgot to tighten the end cap on the trap pipe. It was proposed that the cap worked itself loose every time the furnace shut down and natural gas filled the house. When the on demand furnace started up ...... boom. Very little fire but there was nothing left of the house but the basement. The houses on either side were moved off their foundations. Fiberglass insulation was found 2 blocks over. No one was home in any of the houses.