Coway Bidetmega 500S

Model 500S-E

Warm wateryes
Needs an outletyes
Heated seatyes

Coway's flagship seat and the only Bidetmega with a motorized auto open/close lid, driven from a Bluetooth remote for a fully touchless visit. Triple Hygiene Care stacks WaterShield anti-contaminant misting, automatic nozzle cleaning, and UV nozzle sterilization on top of instantaneous tankless heating, i-wave washing, a deodorizer, and night light. Lists at $699 but routinely sells in the $400-500 range, straddling premium Totos like the S7.

Approx. price

~$449

Best for Tech-first buyers who want a touchless motorized lid and UV hygiene without $1,000+ Toto S7A pricing

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Specifications

Water heating: Tankless (Instant Heat)
Controls: Wireless Remote
Toilet fit: Elongated & Round versions
Power: Needs GFCI outlet within reach
Spray pressure: Adjustable pressure + Turbo, i-wave 3-stage
Nozzle: Stainless wand + UV light & WaterShield mist
Install: under 30 min DIY
Warranty: 1-year limited

Features

Warm wateryes
Heated seatyes
Warm air dryeryes
Wireless remoteyes
Night lightyes
Deodorizeryes
Self-cleaning nozzleyes
Feminine washyes

Auto Open/Close Lid
UV Nozzle Sterilizing
Touchless Experience

What owners like

+Motorized lid opens as you approach and closes quietly after - the only seat in Coway's lineup with it, and it undercuts Toto's auto-lid S7A by hundreds
+UV light sterilizes the nozzle between uses, a genuine hygiene step beyond the self-rinse most seats call cleaning
+WaterShield fine mist coats the bowl to keep waste from sticking, like Toto's PreMist but included at a lower street price
+Instantaneous heating delivers unlimited warm water with i-wave's 3-stage adaptive wash
+Integrated deodorizer plus night light round out a true flagship feature list - nothing is optional
+Sells for $400-500 regularly (nearly 40% off its $699 list), making it cheaper than the Bidetmega 400S was at launch

Common complaints

−Owner reviews run notably weaker than for simpler seats — the motorized lid and electronics generate far more complaints
−Auto-lid troubleshooting is common enough that Coway support runs a dedicated help channel for it
−More motors and sensors mean more failure points, backed by only a 1-year warranty - a third of the Alpha UX Pearl's coverage
−At $699 list it's poor value; only buy at the frequent sub-$500 street price
−Remote is Bluetooth-dependent; pairing hiccups lock you out of lid control
−The 400S at $449 delivers the same core wash quality if you can live without the lid theatrics

Questions buyers ask

Does the warm water ever run out mid-wash?

No. The 500S uses instantaneous (tankless) heating, so warm water is unlimited for as long as you wash. The i-wave 3-stage wash cycles through its stages without the temperature dip you get from tank-heated seats like the Swiss Madison Vivante.

How reliable is the motorized auto open/close lid?

It's the feature that generates the most complaints — owner ratings are dragged down largely by lid and electronics issues, and Coway runs a dedicated support channel just for auto-lid troubleshooting. Most units work as advertised, but you're adding motors and sensors covered by only a 1-year warranty, so buy from a retailer with an easy return window.

Will it fit a round toilet, or is it elongated only?

Coway sells both: the 500S-E for elongated bowls and a separate 500S-R for round. Double-check the model suffix before ordering, since the two are different SKUs rather than one adjustable seat.

What are the electrical requirements?

You need a GFCI outlet within cord reach of the toilet, which many older bathrooms don't have — budget an electrician visit if yours doesn't. Beyond that, install is a standard under-30-minute DIY job using the included T-valve on the toilet's supply line.

What happens if the Bluetooth remote loses its pairing?

The lid control depends on the Bluetooth remote, so pairing hiccups can lock you out of opening and closing the lid from across the room until you re-pair. Owners report it's an occasional annoyance rather than a constant one, but it's worth knowing the touchless experience has a wireless dependency.

Compare the Coway Bidetmega 500S

vs Coway Bidetmega 200N vs Coway Bidetmega 400S

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Heating: Tankless
Control: Wireless Remote
Install: 30-45 min DIY
Warranty: 1-year limited

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Heating: Hybrid Heater
Control: Wireless Remote
Install: 30-45 min DIY
Warranty: 1-year limited

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Alpha Bidet / Electric Bidet Seat

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Heating: Tankless
Control: Wireless Remote
Install: 15-30 min DIY
Warranty: 3-year full

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