No downside.

Waht's the goal? If you just want to flush otu the scale, just hook a
hose and run to a drain. Open the valve,a nd wait awhile.

If you want an empty tank, then the shop vac pressure idea is
excellent.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..

"C & E" wrote in message
...
I've drained these tanks but it takes forrrrreeeeeevvvver to do. Even
the
new one at the cabin. I was thinking about holding a hose connected
to the
exhaust port of a shop vac around a hot water spigot, sealing as much
as
possible with a rag and a firm grip, to pressurize the tank. Sounds
like it
should work. Do you folks see a downside to this??