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ASME or non-ASME Expansion Tank Residential

Hello,
Looking at an Extrol SX30V versus an AX40V for a system
with 8+ lbs total volume and 2.5 to 3.0 expanded capacity.

The price comparison between the ASME nad non-ASME model
is pretty huge. What choice would be suited for the job?

Thank you.
SC Lam
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