As a new member, I would like to thank everyone for the help with my recent wireless thermostat post. It was suggested to me that the expansion tank installed on my new Viessman Vitodens 100-W boiler is undersized, but the technician quoted $499.00 (no joke!) to install the next larger size. I searched online and found the identical tank, which I purchased for the delivered price of $58.75. I would like to install it myself, if I can get advise on the proper procedure. Pictures are apparently too large to post, but the sequence is: cold water feed line, 1/2” 9D-M3 BFP W/ATMOS.VENT, Watts B1156F set 15psi pressure reducing valve, shut-off valve, Black iron Tee down to PROSELECT PSHT15 expansion tank (to be replaced by PSHT30), and up to a SPIROVENT microbubble resorber. Thanks for any help.