fluid expansion tanks

91winsun
91winsun Registered Users Posts: 14
Most SHW systems have an expansion tank inline. How much do those cost???
also, if you plumbed in a 5 gallon tank inline in a drainback set up and put it at the correct height, would that work for expansion of fluid?? or even a 3 inch pipe straight up for 6 ft or so..

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