14 year old Rinnai (r75lsi) needs to be replaced. Has the venting and hookups changed on these things over the years, or can I get away with reusing everything outside the unit? :
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Rinnai R75lsi Parts List - Search Shopping
Rinnai R75lsi Parts List - Search Shopping
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Page 25 of Rinnai Water Heater R75LSI User Guide | ManualsOnline.com