Yes, if you want an electric bidet seat. No, if you’re happy with a non-electric one.
That’s the whole answer, and for a lot of people the second half is the one that matters. But if you do want warm water, a heated seat and a dryer, you need power at the toilet, and the details are worth getting right before you buy rather than after the box arrives.
Here’s what you actually need, what your options are if you don’t have it, and roughly what it costs to fix.
What an electric bidet seat requires
A three-prong grounded outlet, 15 amps minimum, GFCI protected, 120V.
That’s the specification across essentially every manufacturer selling into North America. TOTO lists “120V GFCI electrical outlet required” directly on the Washlet product line. Bio Bidet’s manuals open with the same instruction. It isn’t a brand quirk — it’s what the appliance is designed around.
Three things follow from that, and each one trips somebody up.
The outlet has to be close
Most bidet seat power cords run about 4 feet. That’s it. If your nearest outlet is by the sink on the far wall, the cord will not reach.
The cord may exit the wrong side
This one is genuinely annoying and it’s buried in spec sheets rather than printed on the box.
Most bidet seat cords exit from the right side of the unit as you face the toilet. TOTO Washlets exit from the left. Coway’s Bidetmega uses a 47-inch two-way cord that can be routed either direction, which is the exception rather than the rule.
If you have exactly one outlet and it’s on the opposite side from your seat’s cord, you will be stretching a cord across the back of the toilet or across the floor. Check the spec sheet diagram before ordering. Product photos almost never show the cord.
GFCI: required, or strongly recommended?
Both, depending on your situation.
Current electrical code requires GFCI protection for new bathroom outlets. If you’re having one installed, it will be GFCI — the electrician has no choice, and an inspector will enforce it.
If you have an older bathroom with a pre-existing non-GFCI outlet, a bidet seat will plug in and work fine. It isn’t a code violation to use what’s already there. Every manufacturer nonetheless recommends upgrading, and given that this is a heated electrical appliance connected to a water line, that recommendation is worth taking seriously. A GFCI receptacle is a $15 to $50 part.
Codes vary by jurisdiction. If you’re unsure what applies where you live, ask a local electrician.
Power draw and whether you need a dedicated circuit
Two kinds of electric bidet seat, and they behave differently.
Tank-style seats hold a small reservoir of pre-heated water. Peak draw is roughly 600 to 800 watts.
Tankless seats heat water instantaneously as it flows. Peak draw is roughly 1,400 to 1,500 watts.
Either way, the seat only pulls that during an actual wash cycle. The rest of the day — 23 hours and 55 minutes of it — it’s idling at a very low draw, lower still with eco mode enabled.
In practice, a shared bathroom circuit is usually fine. Most people install a bidet seat on the existing bathroom circuit and never think about it again.
The exception worth knowing: a tankless seat on an older shared circuit can make the bathroom lights flicker briefly when the heater kicks in. It’s uncommon and it’s harmless, but it surprises people who assume they’ve bought a faulty unit. Bio Bidet recommends a separate circuit specifically to avoid this, along with breaker trips on marginal circuits.
If you’re choosing between tank and tankless and your home has older wiring, tank-style is the lower-hassle option.
For new construction, NEC requires a 20-amp circuit with at least a 15-amp outlet.
Extension cords: what each manufacturer actually says
This is where guidance diverges sharply, and it’s worth knowing your brand’s position before you assume.
| Brand | Position on extension cords |
|---|---|
| Kohler | Permitted on some models with a specific spec: cord type beginning “SJ”, 12 gauge, grounded (12/3), no longer than 25 feet, GFCI outlet. Replace at any sign of damage. Some Kohler bidets state not to use one at all — check your model’s manual. |
| Bio Bidet | Permitted if necessary. Three-wire cord with a three-blade grounding plug, three-slot receptacle. The Horizon manual specifies GFCI-compatible and rated for at least 15 amps. |
| General industry guidance | Grounded three-prong, UL or ETL listed, rated at least 13A / 1500W. |
What every source agrees on, regardless of brand:
- No two-prong cords. No light-duty cords.
- No power strips or adapters that defeat the grounding pin.
- Never convert an extension cord into a makeshift receptacle. This is not a code-compliant fix and it’s the one genuinely dangerous shortcut in this whole topic.
- Keep the cord out of walkways and away from splashes or standing water.
- Test the GFCI with its TEST and RESET buttons before you rely on it.
Kohler’s spec is the strictest published one and it’s a reasonable default even if you own a different brand: 12-gauge, grounded, SJ-type, under 25 feet.
An extension cord is a legitimate solution, particularly as a stopgap while you decide whether to pay for an outlet. It is not as good as an outlet. It adds a connection point, it’s visible, and in a bathroom used by someone with mobility or balance concerns, a cord running along the floor is a trip hazard that outweighs the money saved.
What it costs to add an outlet
2026 pricing, and the spread depends almost entirely on which scenario you’re in.
| Scenario | Typical cost |
|---|---|
| Swap an existing standard receptacle for GFCI | $90 – $200 |
| New GFCI outlet on an existing circuit | $150 – $350 |
| New GFCI requiring a new circuit from the panel | $300 – $700 |
National average for a GFCI outlet install sits around $210.
A few things that shape the bill:
Labour is 70 to 80% of it. The device itself is $15 to $50. What you’re paying for is a licensed electrician’s time, typically $50 to $130 per hour, plus a trip fee of $100 to $200 that applies whether the job takes ten minutes or two hours.
Batch the work. Because of that trip fee, adding one outlet costs nearly as much as adding three. If you have other small electrical jobs pending, do them in the same visit.
Placement. For a new bathroom outlet, roughly 12 inches off the floor is the usual recommendation. Put it where the cord can reach without crossing the floor, and on the correct side for your seat’s cord direction. Tell your electrician which seat you’ve bought.
Most straightforward installs are finished in well under an hour.
If you can’t have an outlet
Sometimes the answer is no. Rented flats, listed buildings, bathrooms where running new wire means opening walls. Here’s what’s left.
Non-electric bidet seats
A full seat replacement, same fitment considerations as an electric one, no power required. You get an adjustable spray with proper positioning and control, in a unit that looks and mounts like a normal bidet seat. What you give up is warm water on most models, plus the heated seat and dryer.
Some non-electric seats offer warm water by tapping your bathroom sink’s hot supply, which is worth knowing about if warm water is the feature you actually care about.
Bidet attachments
The cheapest route by a wide margin. Attachments sit between your existing seat and the bowl rather than replacing the seat. No power, minimal plumbing, and they fit a wider range of toilets than full seats do — including many curved and one-piece fixtures that reject seats entirely.
Handheld sprayers
Mount to the wall or the tank, connect to the supply line, no electricity and no seat involvement at all. They require more hand control to aim and operate, which makes them a poorer fit if dexterity is a consideration.
Before you buy: the checklist
- Is there an outlet within about 4 feet of the toilet?
- Is it three-prong and grounded?
- Is it GFCI protected? (If not, is upgrading it worth $90 to $200 to you?)
- Which side does your chosen seat’s cord exit? Does that match where the outlet is?
- Tank or tankless? If your home has older wiring, tank-style is the safer bet.
- If using an extension cord: three-prong, grounded, 12-gauge, UL or ETL listed, and does your model’s manual permit one?
Confirm the electrical side before you order, and confirm the fit at the same time. Our guide to whether a bidet will fit your toilet covers the three measurements that decide it.
Electrical requirements on this page reflect manufacturer documentation published by TOTO, Bio Bidet and Kohler, plus NEC bathroom outlet requirements. Codes vary by jurisdiction and product specifications change between generations — check your model’s manual and your local code. Any new wiring should be done by a licensed electrician.