What a Smart Toilet or Bidet Seat Needs Before Installation

Does a smart toilet need an electrical outlet?

Yes. Every electric smart toilet and bidet seat in the manuals we read needs a grounded, GFCI-protected 120-volt supply — an outlet beside the toilet, or on one Kohler model a hardwired connection made by an electrician [1][2][4][7]. The only kind that needs no outlet is a non-electric bidet seat or attachment, which runs on water pressure alone and washes with unheated water [8].

The reason is heat. These units warm the wash water — TOTO lists an instantaneous heater that warms it as it flows [5][6] — and they warm the seat and the drying air. The specifications show what that draws: a maximum of about 1,425 to 1,435 watts for TOTO’s current WASHLET seats [5], 1,300 watts for the NEOREST 700H [6] and 1,470 watts for Brondell’s Swash T44 [7]. At 120 volts that is roughly 11 to 12 amps, most of what a 15-amp circuit is rated for — which is why the manuals talk about the circuit, not only the outlet.

The cord is short, so the outlet has to be close: 35 inches on Kohler’s smart toilet [1], 1.2 metres (about 3.9 feet) on TOTO’s WASHLET seats [4][5]. Kohler’s manuals rule out an extension cord and a grounding adapter outright [1][2]. In the Clearwater bathroom below, the smart toilet plugs into an outlet low on the wall to the side of it, which is where the manuals draw it.

Does the outlet need GFCI protection and its own circuit?

GFCI protection, yes — every manual we read requires it [1][2][4][7]. A circuit of its own is what Kohler specifies: a dedicated 120-volt, 15-amp circuit protected by a Class A GFCI [1][2]. TOTO asks for wiring rated 15 amps or more and a grounded three-prong outlet on a ground-fault interrupter of 30 mA or less [4]; Brondell asks for an outlet rated at least 15 amps that is not shared with too many other products [7].

A GFCI — ground-fault circuit interrupter — compares the current going out on a circuit with the current coming back and cuts the power when they differ by as little as 0.006 amperes, fast enough to prevent a lethal shock [9]. The National Electrical Code has required GFCI protection for bathroom receptacles since 1975 [9], and Florida’s residential code makes the National Electrical Code the rule for electrical work in houses [11]. But the code applies to new construction and major renovations [9], so a bathroom that has not been rewired since may not have it.

An outlet without TEST and RESET buttons can still be protected: a GFCI receptacle also protects the outlets downstream of it on the same circuit, and a GFCI breaker protects the whole circuit [9]. The CPSC advises testing every GFCI after installation, once a month and after a power failure [9].

Whether the existing bathroom circuit can carry a smart toilet, or a new circuit has to be run, is a question for a licensed electrician. Kohler’s manual says the same: if the plug does not fit the outlet, have the proper outlet installed by a qualified electrician [1].

Where should the outlet and shutoff valve go behind the toilet?

Low on the wall, to the side of the toilet — not directly behind it [1][2]. On Kohler’s smart toilet the shutoff valve sits 10 to 12 inches to one side of the centreline and 3 to 6 inches above the floor, and the outlet 10 to 12 inches to the other side and 5 to 7 inches up [1]. Kohler’s other smart toilet keeps the same 10-to-12-inch offsets and allows either side [2]. TOTO’s NEOREST puts a wall supply 7-1/2 inches from the centreline and 6-11/16 inches above the floor, each within 10 mm [3].

TOTO adds a rule that matters in a small bathroom: never put the outlet directly beneath the water supply, and never let the supply hose touch the outlet or the plug, because condensation can run into it [4]. Kohler adds two steps for the plumbing: install the shutoff, then flush the supply line into a bucket to clear debris before the toilet is connected [1].

Because the numbers change from model to model, the order of work matters: choose the toilet, read its rough-in drawing, and only then let the outlet box and the shutoff go into the wall — before the tile, not after.

• Shutoff valve: 7-1/2 to 12 in from the centreline, 3 to 6-11/16 in above the floor [1][2][3]
• Outlet: 10 to 12 in from the centreline [1][2], 5 to 7 in above the floor on Kohler’s drawing [1]
• Not directly behind the toilet [1][2]; not directly beneath the water supply [4]
• Rough-in: 12 in from the finished wall to the flange centre on all three toilets we read [1][2][3]

What water connection does a smart toilet or bidet seat need?

An ordinary cold-water supply with its own shutoff valve — nothing exotic, but it has to be in the right place and in good order. Florida’s plumbing code already requires a shutoff on the supply to each fixture, with access to it [10], and TOTO and Brondell both say to connect to cold water only [4][7].

A bidet seat on an existing toilet shares the toilet’s water. It comes with a T-valve — TOTO calls it a junction valve — that fits between the supply hose and the tank’s fill valve, at the tank and not at the wall [4][7][8]. If the tank is fed by a rigid tube instead of a flexible hose, Brondell says to replace it with a flexible hose first [7][8], and TOTO says to use only the hoses and junction valve that come with the seat [4].

A smart toilet arrives with its own connection and wants a new one: Kohler and TOTO both say not to reuse an old supply hose [1][6], and Kohler’s current guide extends that to the stop valve when one is supplied [2]. Kohler requires a water-hammer arrestor on one of its smart toilets [1] and recommends one on the other [2]; Florida’s code requires an arrestor wherever quick-closing valves are used [10].

Backflow — wash water being drawn back into the house supply — is handled inside the units we read: TOTO lists a vacuum breaker and a check valve as the backflow prevention devices in its WASHLET seats and in the NEOREST [5][6]. Look for that line in the specifications of the model you choose.

What water pressure does a smart toilet need?

It depends on the model, and the manual gives the range. In the manuals we read, the minimum went from about 7 psi — flowing pressure for TOTO’s WASHLET seats and NEOREST [4][5][6], and the same figure in the specifications of Brondell’s Swash T44 [7] — up to 30 psi of static pressure for Kohler’s smart toilets, which need it for the rim wash [1][2]. The maximums ran from 80 psi static for Kohler [1][2] to about 108 psi static for TOTO [3][4].

Static and flowing pressure are different numbers. Static is what a gauge reads with every tap closed; flowing pressure is what is left while water runs. TOTO ties the NEOREST minimum to a flow of 10 litres (2.6 gallons) a minute or more [3][6], and its WASHLET manual warns that the wash can stop for safety if the pressure drops sharply — for example, when water is being used elsewhere in the house [5].

At the top end Florida’s code already does the work: where static pressure in a building exceeds 80 psi, a pressure-reducing valve is required to bring it down to 80 psi or less [10] — the same figure as Kohler’s maximum. If your pressure is low instead, find out why before you buy a model that needs 30 psi; our article on low water pressure goes through the causes.

How much space does a smart toilet need?

The same as any toilet under Florida’s plumbing code: at least 15 inches from the centre of the toilet to any side wall, partition, vanity or other obstruction, and at least 21 inches clear in front of it to any wall, fixture or door [10]. The ninth edition of the code, which takes effect on December 31, 2026, keeps both numbers [10].

What is different is behind and above. All three toilets we read are drawn for a 12-inch rough-in, measured from the finished wall to the centre of the floor flange [1][2][3]. Kohler warns that nothing behind the toilet may get in the way of the cover when it is raised — decorative items should be at least 42 inches high [2] — and TOTO asks for shelves or cabinets on the wall behind a NEOREST to be higher than 55-1/8 inches so they do not block the remote’s signal, and for a check that the door clears [3].

Measure the 21 inches from where the new bowl’s front edge will be, not the old one’s: the NEOREST in our sources is 820 mm (32-5/16 inches) deep [6]. Our MaP article explains how to measure the rough-in of the toilet you have now.

Can you install a bidet seat without an outlet?

Yes, if it is a non-electric one. Brondell’s SimpleSpa attachment, for example, needs no batteries or electricity: it fits under the existing seat, connects through a T-valve at the tank, and washes with water at room temperature, with a lever that sets the pressure [8].

What you give up is everything that needs power: warm wash water, a heated seat, a warm-air dryer [5][7], and on an integrated smart toilet the electric flush as well — the NEOREST falls back to a hand lever when the power is out [6].

If the bathroom is being remodelled anyway, that is the moment to have an electrician put a GFCI-protected outlet where your model’s drawing shows it, even if you start with a non-electric seat. Adding one later means opening a finished wall.

Who installs a smart toilet: a plumber or an electrician?

Often both. If a GFCI-protected outlet is already in the right place, it is a plumbing job: the toilet set on the flange, the shutoff valve, the supply hose or T-valve, and the leak test. If it is not, the outlet — and the circuit, if a new one is needed — is electrician’s work. Kohler’s manuals say so: have the proper outlet installed by a qualified electrician [1][2], and on a hardwired installation a qualified electrician should make all the electrical connections [2].

We are plumbers. We install smart toilets and standard toilets; the outlet and the circuit behind them are an electrician’s work.

The photograph below is a Clearwater bathroom where the smart toilet was set on its wood-look tile while the outlet box in the wall beside it was still open, with no receptacle fitted yet; its plug lies on the floor until there is one. On some models the order matters more than on others: TOTO’s NEOREST manual notes that water can run into the bowl after the shutoff is opened until the unit is plugged in, and says to fit batteries in its battery box if the outlet is not ready yet [3].

What this means in Clearwater and across Tampa Bay

The three smart toilets in these photographs are in Clearwater bathrooms: one finished, with its display lit; one plugged into an outlet low on the wall beside it; one set while the outlet box beside it was still waiting for its receptacle.

The rules in this article are statewide. The 15-inch and 21-inch clearances and the shutoff on every fixture come from the Florida Building Code, Plumbing, and apply the same way in Clearwater, Largo, Dunedin and Tampa [10]; electrical work in a house follows the National Electrical Code that Florida’s residential code adopts [11]. What varies from house to house is what is already in the wall — whether the bathroom outlet is GFCI-protected, where the shutoff is, and what pressure the house has — and that is worth checking before the toilet is ordered.

FAQ

Sources

We review and cite. We do not reproduce a paper or a manual — follow the links for the originals.

1. [1]Installation Instructions — Smart Toilet (1486085-2-C) — Kohler Co.Manufacturer's manual · dedicated 120 V, 60 Hz, 15 A circuit with Class A GFCI; no grounding adapter, no extension cord; outlet not fitting → proper outlet installed by a qualified electrician; 35-in cord; site drawing: 12-in rough-in, supply stop 10–12 in from centreline and 3–6 in above floor, outlet 10–12 in from centreline and 5–7 in above floor, neither directly behind the toilet; flush the supply line into a bucket; do not reuse an old hose; minimum static pressure 30 psi for rim wash, maximum 80 psi; water-hammer arrestor required; read 2026-10-11
2. [2]Installation Instructions — Smart Toilet (1295780-2-D) — Kohler Co.Manufacturer's manual · dedicated 120 V, 15 A circuit with Class A GFCI; no adapter, no extension cord; plug-in site drawing: 12-in rough-in, supply stop and outlet each 10–12 in from centreline, either side, never directly behind the toilet; decorative items behind at least 42 in high to clear the cover; hardwired: a qualified electrician makes all electrical connections; 30–80 psi static; do not reuse a previously installed hose and stop valve; water-hammer arrestor recommended; read 2026-10-11
3. [3]NEOREST (Toilet bowl) — Installation manual (H0B145S, for MS992CUMFG / NEOREST 700H) — TOTO U.S.A. · 2015Manufacturer's manual · 12-in (305 mm ±10 mm) rough-in; wall water supply 7-1/2 in (190 mm ±10 mm) from centreline and 6-11/16 in (170 mm ±10 mm) above floor; minimum 7 psi flowing at 2.64 gal/min, maximum 108 psi static; shelves on the rear wall above 55-1/8 in for the remote signal; check door clearance; water may run into the bowl until the unit is plugged in — batteries in the battery box if no outlet yet; read 2026-10-11
4. [4]WASHLET Installation Guide (D07877) — TOTO U.S.A. · 2020Manufacturer's manual · AC 120 V, 60 Hz, wiring rated 15 A or more; grounded three-prong outlet on a GFCI of 30 mA or less; 1.2 m (3.93 ft) cord; no outlet directly beneath a water supply, hose must not touch the outlet or plug (condensation); no extension cords or adapters feeding many devices; cold water only — hot water may cause burns and damage; use only the supplied hoses and junction valve; 7.25 psi dynamic to 108.78 psi static; read 2026-10-11
5. [5]Instruction Manual — WASHLET SW3946 / SW3216 (D07L05) — TOTO U.S.A. · 2024Manufacturer's manual · specifications: maximum power 1,425 W (SW3216) and 1,435 W (SW3946); instantaneous water heater; 3.9 ft (1.2 m) cord; backflow prevention device: vacuum breaker, check valve; minimum 7.25 psi dynamic, maximum 108.75 psi static; wash may stop for safety if supply pressure drops significantly; read 2026-10-11
6. [6]Instruction Manual — NEOREST 750H / 700H (D07962R) — TOTO U.S.A. · 2021Manufacturer's manual · maximum power 1,300 W; instantaneous heater; backflow prevention: vacuum breaker, check valve; minimum 7.25 psi dynamic with 10 L/min (2.6 gal/min) or more, maximum 108.75 psi static; 820 mm deep; use the new hose set, do not reuse an old one; hand-lever flush in a power failure, AA batteries in the battery box for outages of 2 days or longer, bucket flush when the water is off; read 2026-10-11
7. [7]Owner’s Manual — Swash T44 Luxury Bidet Toilet Seat (T44-EW / T44-RW) — BrondellManufacturer's manual · grounded GFCI outlet; nominal 120 V circuit, minimum 15 A; do not use an outlet or power strip shared by too many products; extension cord only if necessary, 15 A minimum, three-wire, grounding plug; T-valve at the fill valve under the tank, not at the wall; replace a rigid supply line with a flexible hose; cold supply only; 7.11–106.7 psi; maximum 1,470 W; read 2026-10-11
8. [8]User Manual — SimpleSpa Bidet Attachment (SS-10) — BrondellManufacturer's manual · non-electric: no batteries or electricity required; ambient-temperature wash with adjustable pressure; T-valve at the fill valve under the tank, not at the wall; replace a rigid supply line with a flexible hose; 11.60–116.03 psi; read 2026-10-11
9. [9]What Is a GFCI? (CPSC Fact Sheet, Pub. 099) — US Consumer Product Safety Commission · 2010Government or standards body · trips on a difference as small as 0.006 A; the NEC has required GFCI protection for bathroom receptacles since 1975 and typically applies to new construction and major renovations; a GFCI receptacle also protects outlets downstream, a GFCI breaker the whole circuit; breaker and receptacle GFCIs may be installed by a qualified electrician; test after installation, monthly and after a power failure; read 2026-10-11
10. [10]Florida Building Code, Plumbing, 8th Edition (2023) — §405.3.1 fixture clearances, §604.8 pressure-reducing valve, §604.9 water hammer, §606.2–606.3 shutoff valves and access — International Code Council / Florida Building Commission · 2023Law / code · read 2026-10-11 in a browser on codes.iccsafe.org (chapters 4 and 6); 15 in from centre to side wall, partition, vanity or obstruction, 21 in clear in front; PRV where static pressure exceeds 80 psi; arrestor where quick-closing valves are used; shutoff on each fixture supply except tubs and showers in residences; the 2026 (9th) edition, effective 31 December 2026, keeps the same §405.3.1 clearances
11. [11]Florida Building Code, Residential, 8th Edition (2023) — §E3401.1 Applicability — International Code Council / Florida Building Commission · 2023Law / code · electrical systems, equipment and components shall comply with NFPA 70, the National Electrical Code; read 2026-10-11 in a browser on codes.iccsafe.org