Washlet+ Systems with a Tank Water Heater

While the above Washlet+ bidet toilets come with a tank water heater, higher end Washlet+ units offer an instant water heater. The bidet seats included in TOTO's WASHLET+ systems feature either a tank heater or an instant heater.

Tank water heating systems keep a limited amount of warm water on hand at all times, resulting in about 30 to 60 seconds of wash time. If you run an extra long wash cycle or if the unit is used several times in quick succession, the warm water in the tank may run out. If this happens, the unit will switch to cool water until the tank can refill and reheat, a process that usually takes a few minutes.

Tank heaters take up more space than instant or hybrid heaters, which translates into a smaller seat size. As a result, bidets with tank heaters aren't always as comfortable to sit on as those with instant heaters.

While you might not have warm water for your whole wash, tank heater bidets do have the benefit of being less expensive than those with instant or hybrid heaters. WASHLET+ systems paired with the C2 and C5, which have replaced the discontinued C100 and C200 seats, all feature tank heaters.