last year we moved into a 5 year old house.
the insurance people say if we go away for a month we have to drain the gas water heater.
we looked at the drain valve and there is a hole in the floor under it.
handy we thought - till we realised it just emptied into the crawl space!
we store stuff in there - the gas furnace keeps it dry.
In the crawl space under the water heater is a big black pipe - draining from the sinks etc we assume.
can we have the water heater drain into that black pipe?
it is several inches diameter.
tipe, alerts, and warnings appreciated.
trap? backflow valve?