Looking to install an expansion tank for my new water heater. The old one didnt have one when I bought the house and just crapped out yesterday. Now I know the tank needs to be supported because if it ever fills with water it will be very heavy. I read that it shouldnt be installed upside down because if it should fill with water it will be a mess when removing it. However, can one be installed right above the cold water inlet to the boiler using a tee? if it should fill up once you drain down the boiler it will drain into the boiler no? Also the weight would be transferred straight down so no need to hang?