Delta toilet installation overview
Delta uses standard US 12-inch rough-in + universal aftermarket parts. Install procedures match other residential toilets. One-piece models (smart toilets and designer skirted) require two-person install. Smart toilet models additionally require 110V electrical for bidet seat operation.
Tools required
- Adjustable wrench (8-10 inch)
- Channel-lock pliers
- Screwdriver (Phillips + flathead)
- Level (4-foot)
- Bucket + sponge
Materials required
- Wax ring (Korky 6000 or Fluidmaster 7530, $5-$10) — typically NOT included with Delta
- Floor flange bolts ($3-$5 brass set)
- 12" braided supply line ($5-$10) — replace at install
- SoftClose seat (typically included with Delta)
Install time by Delta model
| Model type | Install time | Crew |
|---|---|---|
| Two-piece elongated (mainstream) | 45-60 min | 1 person |
| One-piece elongated | 60-90 min | 2 people |
| One-piece skirted (designer) | 90-120 min | 2 people required |
| Smart toilet (with bidet integration) | 2-4 hours | Plumber + electrician recommended |
Standard Delta two-piece install (45-60 min)
- Shut off water at under-toilet shutoff valve
- Flush old toilet to empty
- Disconnect supply line, remove old toilet
- Install wax ring on flange
- Set Delta bowl on flange, verify plumb
- Hand-tighten flange bolts only
- Install tank-bowl gasket on flush valve outlet
- Set tank on bowl, cross-tighten bolts 1/4 turn alternately
- Connect supply line, restore water
- Test 3-5 flushes
- Install bundled SoftClose seat
One-piece install — additional considerations
- Two-person lift required (~90-100 lbs single unit)
- NEVER twist during placement
- Floor must be flat — setting compound if needed
- Wax ring with horn recommended
- Floor flange at/below floor level for skirted models
Smart toilet install — electrical requirements
- 110V GFCI-protected outlet within 4 feet of toilet location
- Dedicated 15-amp circuit recommended for high-power bidet seats
- Cold water supply only (smart toilet heats water internally)
- Delta bidet seat installation per manufacturer instructions
Common Delta install mistakes
- Wax ring not purchased: Delta ships without wax ring despite bundled seat
- Tank-bowl bolts overtightened: cracks porcelain
- One-piece on out-of-level floor: cracks at unsupported edge
- Skirted-trapway flange not below floor level: won't seat correctly
- Smart toilet without GFCI outlet: code violation in bathrooms