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Buffer tank question

VRM Member Posts: 4
Can get a scratch and dent Vitocell indirect at a good price. Had this idea to use it as a buffer tank and as a "preheater" for DHW. My boiler is NOT plumbed primary secondary. The Vitocell has inlets/outlets at the top and bottom of the tank in addition to the connections for the indirect coil. Would this tank as a buffer be better placed on boiler supply or return side. I've been leaning to the supply side with the boiler supply plumbed to the bottom of the Vitocell and supply to the house coming from the top of the Vitocell. I see plenty of information about 2,3, 4 pipe buffer tank piping used in conjunction with primary secondary piping but can find little about just putting a tank as a buffer inline on either the boiler supply or return.