Talk:Expansion tank

advice needed
I have an expansion tank installed in the cold water feed of my water heater. I suspect that some of the warm water in the expansion tank is being drawn into the domestic cold water of my faucets which doesn't allow this cold water to be as cold as it should be. Is this possible and would a check valve on the cold water side of the expansion tank help?
 * Adding a check valve will defeat the purpose of an expansion tank since the water must enter and exit as it expands and contracts. A check valve would prevent this exiting.
 * It is very unlikely the expansion tank is the cause of the warm water. Water does not flow through the tank.  It is like taking a small paper bag and placing the end over your mouth.  As you breath out the air enters the bag, breathing in causes the same air to return to your lungs.  Only a small volume of water enters and exits the tank.
 * Cold water lines that run adjacent to heat sources or inside walls that receive sun light will warm as the water sits in the pipe. When the water is first turned on it will be warmer until it is replaced by water that has been sitting in the pipes underground. Chuckrau (talk) 18:08, 10 February 2009 (UTC)
 * I don't believe the expansion tank belongs there. A check valve in the cold water feed would make more sense. Jaho (talk) 07:28, 13 July 2010 (UTC)

sentence doesn't really make sense
There is something wrong with the second sentence of the first paragraph; as it stands it doesn't really make sense. Librarian16 (talk) 19:08, 1 December 2008 (UTC)

expantion tank
it's a good idea that explain about the type of open expantion tank.and the diffrence between nitrogen open expantion tank and diaphraghm open expantion tank .expantion tank — Preceding unsigned comment added by 2601:644:8402:EC80:1CCC:FFB2:75FD:FD5 (talk) 16:18, 4 March 2018 (UTC)mirzazadeh|Saeed mirzazadeh]] (talk • contribs) 04:51, 26 June 2011 (UTC)