I often see water heaters installed on combustible floor materials. When I research is this is allowed I find this:
10.28.2.2 Unlisted water heaters shall be installed with a
clearance of 12 in. (300 mm) on all sides and rear. Combustible
floors under unlisted water heaters shall be protected in
an approved manner.
Today’s inspection the water heater was built by Kenmore. The Kenmore installation instructions state:
“This water heater must not be installed directly on carpeting.
Carpeting must be protected by metal or wood panel beneath
the appliance extending beyond the full width and depth of the
appliance by at least 3 inches (76.2mm) in any direction, or if
the appliance is installed in an alcove or closet, the entire floor
must be covered by the panel. Failure to heed this warning may
result in a fire hazard.”
It specifically recommends a wood panel.
So my question is…How do you know if a water heater is “listed” or “unlisted” in regards to the combustible base issue?