GUI37 Hydronic Expansion Tank for Heating System Carbon Steel Grey Holds 2.1 Gal, 2.1 Gallons, Gray

I picked this up when building the manifold for my floor heating system. It appears to be well built with clean threads on the attachment point. It is now installed and helping relieve pressure build up in my system. I'm running about 25lbs of pressure on the system and it appears to be handling it with no problem.

The item description states 3/4 inch fitting but it is only 1/2 inch. I like to rely on Amazom to provide accurate information. This error caused me to take time during Covid-19 to go to the hardware store for a reducer. The cost was not the issue. The effort involved was. The product was well made and works as it should. No complaints there.UPDATE: failed after just a few monthe...filled with water and became useless

They are precharged to 12psi and I installed upside down (threads down) and included a threaded shutoff. I installed without having a gauge for my water. My system's water pressure turned out to vary between 38 and 50psi. 50psi is only 10psi below this tank's maximum. It's on a Solar hot water system. I had to remove it after turning the valve off and it was like a water cannon. Pretty exciting. Charged to 40psi and reinstalled. I give it 4 stars because of its 60psi rating. My 400 year old boiler plumber installs upside down because they last longer and more capacity. The ball valve has already saved me from refilling the system once. I'm still not exactly sure what pressure I should have charged it to given my range of water pressures. I went with the lower end so as to not stress the bladder more.

I purchased a" Flextrol" FTH30 Hydronic Expansion Tank 4.8 gallons, to replace a" Amtrol" 3.5 gallon expansion tank that was leaking. I also purchased a Taco HY Vent Cair valve. I was pleasantly surprised that the tank arrived in only 3 days, when I had expected arrival in over 1 week. After cleaning the dirt and rust from around the old unit, I removed the old "Amtrol" tank that was rusted through with a little difficulty and installed the new "Flextrol" tank. I did not have any difficulty installing the new tank - it fit perfectly. I changed out the old Taco bleed valve and installed the new valve.When The heating system was started, it took only 15-20 minutes for the system to equalize. Both of the new parts worked as expected.Bottom line, great price, super fast delivery, direct fit, and a real happy customer.Anthony J Lux

First time install, leaking water from the shell.

Perfect for a small hydronic heat system factory charged at 12 psi holds up to the heat easy to install perfect size for closet installation

Great replacement for rotted tank, that had a burst bladder also. Best price ever.

JUNK!!!! Had item hooked up for almost 3 months came home to flooded basement because the bottom half of the tank blew off along with the diaphragm. This unit is absolute garbage. Would give it zero stars if I could. I’ll post pictures shortly.