Coway / Electric Bidet Seat
Coway Bidetmega 400S
Coway retired the original Bidetmega 400 and replaced it in 2025 with this 400S — same design-award-winning minimalist look, now with instant tankless heating and 'Triple Hygiene Care' (anti-stick WaterShield bowl mist, auto-cleaning stainless nozzle, and UV nozzle light). Its signature i-wave system runs automated multi-stage wash courses that vary pressure, temperature, and motion. Lists at $599 direct but typically sells around $450 on Amazon.
- Heating
- Tankless
- Control
- Wireless Remote
- Install
- 30-45 min DIY
- Warranty
- 1-year limited
- i-Wave Auto Wash
- UV Nozzle Care
- Design-Award Looks
Best for Design-conscious buyers who want a one-button automated wash routine rather than fiddling with settings each visit
Full specs & owner notes


