"Peter Langevin" wrote in message
...
I recently installed a Takagi Flash TK-jr tankless water heater. Let
me first say that I absolutely love it, it performs flawlessly, and
I've already seen a decrease in my gas bill.

That said, I removed the old tank unit and drain pan, and I did
install a pressure relief valve on the new unit, complete with 3/4"
copper drain line. The old copper drain line emptied into the pan,
but it seems like a complete waste to install a huge round drain pan
under this new, very small, tankless unit.

The UPC requires a watertight pan in attics, where it is, with a
minimum 3/4" drain that terminates to the outside.

My question is.... what have others done for the tankless units?
What kind of drain pan arrangement have you used?

I didn't use a drain pan, I plumbed the T&P valve to run outside. I think
the idea of having a water tight pan for attic installations is in the event
of a tank rupture so you don't have 40 gallons of hot water flooding out
your ceiling. With the tankless the heater is the strongest link in the
chain. Since you have no tank to leak, a burst is more likely in the pipe
going to or coming from the heater. In the event of a full on gas type
failure, the T&P valve is going to relieve the pressure long before the
pipes burst.

If the inspector demands a drain pan, have a sheet metal shop male a funnel
type thing to hang under the heater with a drain you can either hook up to a
hose or pipe to run across the attic and out the eve. Just be sure that the
funnel does not interfere with gaining access to the heater for service.

--

Roger Shoaf

About the time I had mastered getting the toothpaste back in the tube, then
they come up with this striped stuff.