Expansion Tank

[beenthere]

I learned to carry a Taco tank valve for the ones without an air vent and just a drain cock.
I've installed quite afew of them, and then drained the tank.

In my early years, I drained more then one by the boiler drain though. PITA

[tinknocker service tech]

not many left arround here. At least i havent seen but one in two years now

those tanks IMO were great compared to the diaphram tanks

[beenthere]

I hated bladder tanks at first.

But since I can change out a bad resi bladder tank faster then I can drain a steel tank.
I can't imagine installing a steel tank.

[Dave-B]

Where do you install the expansion tank , in the return or supply side of the boiler. I am an apprentice and install boilers with my boss. I was taught that they go in the return side but he says the supply. He's the boss so I do what he tells me and dont argue.

I always install them on the supply side of the boiler.

[hedtedjr]

The tank always goes before the circirculator. Which side of the system you are on (supply/return) depends on if you are pumping towards or away. Each set up has its own set of advantages and disadvantages.

[GLMBurner]

I run the tank on the supply side of the boiler on the units that have the circ. on the return, I have seen it done every which way on jobs that others installed

[snookered]

Pick up the book, "Pumping Away" by Dan Holohan. It has a wealth of information regarding piping options for hydronic systems. Lots of diagrams too.