The Aviva Premiership side ran in seven tries, of which winger Horacio Agulla claimed three, and remain on course to top Pool 4.
Flanker Simon Taylor set Bath on their way after just two minutes before a quickfire double from Argentina wing Agulla put the visitors in total command.
A converted Tom Biggs score gave Bath the bonus-point and saw their lead extended to 24-0 at half-time.
Full-back Jack Cuthbert added try number five on 45 minutes and substitute Mark McMillan crossed soon after.
A late Luigi Ferraro consolation gave the home supporters a rare moment of cheer, however Bath, and Agulla had the final say.
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