High-affinity transporter for the intake of thiamine. H(+)(in) + thiamine(out) = H(+)(out) + thiamine(in) High expression in kidney, brain, lung and small intestine (PubMed:11136550). Detected in pancreatic acinar cells (at protein level) (PubMed:22194418). Also expressed strongly in pancreatic islet cells (PubMed:22194418). Thiamine uptake by pancreatic acinar cells from knockout mice was found to be significantly lower than uptake by pancreatic acinar cells of the wild-type littermates. Belongs to the reduced folate carrier (RFC) transporter (TC 2.A.48) family.