Distributor warranty obligations

Question posted by Stuart White, on behalf of Department of International Trade in PO15

I am looking for a good place to find out the exact warranty obligations that distributors have B2B & B2C when selling online in Europe (irrigation equipment), i.e if the client is not there when goods arrive, if client wants to return goods, if faulty, do obligations differ B2B & B2C and if they are obliged to or arrange for disposal of packaging in Germany for example.

Any sources or useful contacts would be really helpful

Many thanks