Whirlpool install requirements are identical to State and AO Smith Signature for equivalent product types (same manufacturing).
Standard atmospheric gas (NU122, NU161 Energy Smart)
- Existing B-vent chimney with proper draft
- Gas line: ½" up to 40k BTU / ¾" for 50k+ BTU
- Combustion air per code (50 cubic feet per 1,000 BTU/hr in confined spaces)
- T&P discharge to floor drain
- Drain pan with overflow when above living space
Power Vent (NU-PWVT)
- 120V dedicated outlet within 6 ft of unit
- PVC sidewall venting (2" or 3")
- Vent length per manual (typically 65-100 ft equivalent)
- Termination clearances from windows, doors, grade per code
Direct Vent
- Two-pipe sealed combustion venting
- 120V outlet for inducer fan
- Vent up to 60 ft equivalent length
- Termination per code
Standard electric (EU122, EU161 Energy Smart)
- 240V dedicated 30A circuit
- 10-gauge copper wire (most installs)
- T&P discharge
- Drain pan when above living space
Hybrid Heat Pump (UE6T-H)
- 240V dedicated 30A circuit
- 700+ cubic feet of unconditioned air space
- Ambient 40°F+ for heat pump mode
- Condensate drain — 4-8 gallons/day
- Clearances: 7" front, 4" sides, 7" top
- Compressor noise ~50-55 dB — not for finished living areas near bedrooms
Permits
Required in most US jurisdictions.
Bottom line
Whirlpool installs follow standard tank water heater rules. Hybrid Heat Pump requires verifying the 700+ cubic feet air space — most install failures stem from inadequate space.