One-piece toilets are constructed from a single piece of porcelain with no seam between the tank and the bowl. Two-piece toilets are comprised of a separate tank and bowl that are fitted together to form one unit. One piece WASHLET+ toilets are usually paired with TOTO’s C2, and C5 WASHLET+ bidet seats, but are also available with the S500e and S550e.

One-piece toilets offer a few advantages. First, they’re easiest to keep clean since their seamless design leaves fewer nooks and crevices for dirt can hide. Second, a one-piece toilet’s tank is often shorter than that of a two-piece toilet, which frequently makes them the more compact option. Finally, one-piece toilets have a sleeker, more streamlined look than two-piece toilets, which have a distinct seam where the bowl and tank meet.

Already have a 1 piece toilet? Get a bidet seat that fits it: browse bidet seats for one piece toilets