Mikepier wrote:
My water heater has a 3/4" copper pipe from the T&P valve extending
down about 8" from the floor. I have a sump pit about 5 feet to the
left. I wanted to somehow route this discharge pipe into the pit in
case somethig happens.
Obviously it would be easy if I used some kind of flexible hose rated
for high temps. Is there anything wrong in doing it this way? How is
it usally done?

I can think of a number of fairly easy ways to do what you want.

Since you mentioned a high temp flexible hose, maybe one easy way would be
to go to an auto parts store and buy a length of radiator hose and a hose
clamp. Clamp the hose to the existing 3/4-inch copper and run it to the
sump pump pit.

Or, get some PVC pipe and fittings and run PVC from the copper to the sump
pump pit. They make PVC overflow tubes for hot water tanks that are like
the copper one you have now, so regular PVC should be okay in terms of
temperature issues etc. You could either use the same size PVC pipe and an
adapter to the copper, or you could use a larger PVC pipe and fittings --
such as 1-inch or 1 1/2 inch PVC -- and just have the copper go into the
larger PVC similar to the way a washer drain line goes into a larger washing
machine drain line.