Heat Pump Water Heater Electrical Requirements: 120V vs 240V

Check the circuit before you order

120V and 240V heat-pump water heaters are different installation choices

The voltage label is only the first check. Compare the exact model’s breaker, circuit, connection, element load, and installation instructions with the service and panel conditions confirmed for your home.

Do not choose from voltage alone. A separate 120V model can have different recovery and first-hour delivery from a 240V model in the same brand family. The current manual, local code, permit authority, and qualified installer or electrician control the final work.
Currentmanufacturer model evidence
0interchangeable voltage assumptions
1official power source per model
Current electrical information for featured U.S. HPWH buying-guide models
Exact represented modelPublished power informationSeparate 120V family statusBefore purchase
A. O. Smith HPTA-50 210208–240V; 4,500W maximum; 23.6A listed by the manufacturerNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
Ariston ARIHPWH-50208–240V integrated heat-pump water heater; no reviewed 120V option in this familyNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
Bosch TR7000T – 50US208–240VAC, 30A, two 4,500W electric elementsNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
Bradford White RE2H50S10-1NCTT208/240V integrated heat-pump water heaterNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
GE Profile PH50S10BNY01240V, 30A dedicated circuit for PH50S10BNYNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
LG APHWC501MSingle-phase 208/240V; 30A overcurrent protection listed in LG service dataNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
Rheem PROPH40 T2 RH375-SO240V, 30A class with 4,500W elements in the reviewed manufacturer literatureRheem Performance Platinum 120V plug-in models use different XE model numbers and delivery characteristics.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
Rinnai REHP80BM208/240V integrated products; no reviewed 120V optionNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
SANCO2 GS5-45HPC HP + ECO-83SSAQB208/230V single phase, 15A breakerNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
Stiebel Eltron Accelera 220 E208/220–240V, 15A breaker, 2.15kW maximum inputNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.
Cala Systems RDH6524M1240V, single phase, 30A double-pole breaker, and two 4,500W resistance elements; Cala sources conflict on 60 Hz versus 50/60 HzNo separate 120V option is verified in the reviewed family record.Confirm the exact breaker, circuit, conductor, connection, disconnect, and permit requirements on site.

Compare each exact model without leaving the guide

A five-question electrical checklist

  1. What is there now? Record the existing fuel, voltage, breaker, circuit use, and water-heater connection without assuming the replacement can reuse them.
  2. Is the circuit dedicated? Confirm whether another load shares it and whether the exact model requires a dedicated branch circuit.
  3. Can the panel support it? Have a qualified professional evaluate service and panel capacity; a spare breaker space is not proof of available capacity.
  4. How does the exact unit connect? Verify hardwire, cord-and-plug, receptacle, disconnect, and conductor requirements from the current instructions.
  5. What changes with a 120V model? Compare recovery and first-hour rating for that exact separate model, not just the brand or tank size.

Evidence reviewed 2026-08-26. Refresh required before 2026-08-28. This comparison is planning information, not electrical or installation approval.