TOTO Washlet C5 review: the spec sheet, read closely

What we did, and did not, do

We have not tested this seat. Nobody on this site has sat on a C5, timed its dryer or measured its spray. What follows is TOTO’s own specification sheet for the SW3084, read line by line, with the gaps called out. That is the honest version of a review from a site that does not buy products, and it is more than most listings give you.

The published numbers

The figures TOTO states on the C5 spec sheet:

• Power: “AC 120 V 60 Hz”, with “Power Consumption 403W” and “Max Power Consumption 512W”.
• Cord: “3.93 ft (1.2 m)”.
• Spray volume: rear cleansing “0.07 – 0.11 gal/min”, rear soft cleansing the same, front cleansing “0.08 – 0.11 gal/min”.
• Water temperature: adjustable “95 – 104 ºF (35 – 40 ºC)”.
• Seat temperature: adjustable “82 – 97 ºF (28 – 36 ºC)”.
• Dryer: adjustable air temperature “95 – 140 ºF (35 – 60 ºC)”, airflow “8.83 ft3/min (0.25 m3/min)”.
• Water pressure: minimum “7.25 PSI (Dynamic)”, maximum “108.75 PSI (Static)”.
• Warranty: “One Year Limited Warranty”.

Each of those has a safety device listed beside it — a “Temperature Fuse” on the spray, the dryer and the seat — and the seat is certified to “ASME A112.4.2, ASME A112.18.1/CSA B125.1, UL 1431, CSA C52.2 #68” with “IAPMO(cUPC)” certification.

Where TOTO’s own sheet contradicts itself

On the same page, the feature list says the C5 has “Warm air drying with three variable temperature settings”, while the product specification paragraph below it says the seat “shall have warm air drying with five variable temperature settings”. Three or five: TOTO publishes both, in the same document.

It is a small thing, and it is exactly the kind of small thing worth knowing before you buy on a spec sheet. We have not resolved it, because resolving it would mean owning the seat.

Install: the outlet is the whole question

The C5 mounts on the existing seat bolt holes and includes a “Docking station for easy cleaning and installation”, so the seat lifts off the base for cleaning. No drilling, no plumber for the seat itself.

The catch is power, and it is a measurement, not an opinion: the cord is “3.93 ft”. If the nearest outlet is further than that from the back of the bowl, an extension cord in a bathroom is the wrong answer and a GFCI outlet installed by an electrician is the right one. TOTO also recommends “a surge protector to prevent damage in the event of a power surge”.

Two more lines from the install notes matter before you order: “WASHLET C5 may not fit certain toilet bowl designs”, and “For use with potable water only. Do not use with recycled water.” The install steps are covered here.

Running cost: what 403 W does and does not tell you

403 watts sounds alarming next to a 90 W towel rail, and it is not comparable. That figure is what the seat draws while it is heating water and air, not what it draws all day. A seat that heated at 403 W continuously would cost about $1.77 a day at 18.34 cents per kWh — and no bidet seat does that.

What TOTO does not publish is a standby figure or a duty cycle, and without one of those the daily cost cannot be calculated. We are not going to estimate it. The honest summary: the electricity is a small line, the seat is the expense. What bidets cost is covered here.

Who should buy it

• Buy it if you want warm water and a dryer, you have an outlet within about four feet of the bowl, and you want the version whose maker publishes the numbers.
• Buy the SE400 instead if the price gap matters more than on-demand heating, and you prefer side controls to a remote.
• Buy an attachment instead if there is no outlet at all: a non-electric attachment needs neither power nor a fitting. The attachments are ranked here.

If you rent

The C5 rates Ask first on our install rating. The seat itself is fully reversible — it comes off the bolt holes and the original seat goes back — but it needs a permanent outlet beside the toilet, and that is a landlord conversation in most rentals. The renter-safe bidets are ranked here.