On Jan 23, 8:35*am, Mikepier wrote:
I'd be concerned that you have a large enough supply to run both the furnace and
HW heater at the same time.

Should not be a problem since that is what I had originally. The pipe
running across the ceiling is 1", then there is a 1"X3/4"X3/4" Tee.
One 3/4" drop comes by the furnace (which then Tee's to 1/2" to feed
the furnace). The other 3/4" went on to feed the old HW heater/dryer/
stove.
What I did was add another 3/4" tee by the furnace drop. Plus I am
eliminating the old HW heater.
So I'm not changing the size of pipe or adding on something else. The
volume of gas stays the same.

How old is that old water heater? The reason I'm asking is that
there's no draft hood on it. They have been required for some time
and that heater doesn't look ancient.

R