50-gallon electric water heaters serve households of 2–3 people in homes without gas service. This capacity class is also common in homes converting from gas to electric (often paired with rooftop solar) and in apartments with electric-only utility setups.
Top picks
Best overall: Rheem Performance Platinum 50-gal Electric
50 gallons stored, two 4500W heating elements (240V), UEF 0.93, 64-gallon first-hour rating, 12-year tank and parts warranty. ENERGY STAR certified. EcoNet WiFi support enables remote temperature control, vacation mode scheduling, and leak detection alerts. About $749 unit, $1,300 installed. The 12-year warranty is the longest mainstream electric tank warranty.
Best lifetime durability: Rheem Marathon 50-gal Lifetime Electric
Polybuthylene tank that cannot rust through, hence the lifetime tank warranty. Two 4500W elements (same as Performance Platinum), UEF 0.93. About $1,899 unit, $2,500 installed. The math works for households intending to stay in the home 12+ years. The Marathon is also the right answer in extremely hard water where standard tanks fail at year 7–9 from tank-side corrosion.
Best heat-pump alternative: Rheem ProTerra 50-gal Hybrid
Technically an electric water heater (uses electricity), but operates as a heat pump rather than resistance heating. UEF 3.55 (vs 0.93 for standard electric resistance). Operating cost $13/month versus $48/month for standard electric. About $1,799 unit, $2,800 installed before rebates that often cover the install premium. Requires 750 cubic feet of air around the unit — basement or large utility room only.
Best AO Smith / Lowe's: AO Smith Conservationist 50-gal Electric (ENT-50)
50 gallons, two 4500W elements, UEF 0.93, 6-year warranty. ENERGY STAR certified. Direct competitor to the Rheem Performance Platinum at Home Depot. About $599 unit, $1,200 installed.
Best budget: Rheem Performance 50-gal Electric
Standard mid-market electric. 6-year warranty (vs Platinum's 12), same 4500W dual-element design, same UEF 0.93. About $599 unit, $1,100 installed. Right answer for rentals, vacation homes, and 5-year ownership horizons.
Why 50 gallons for electric instead of 40
Electric heating elements recover slowly — about 21 gallons per hour at a 90°F rise versus 37 gph for a typical 40K BTU gas burner. The reservoir matters more for electric than for gas because the unit cannot keep up with heavy demand through recovery alone.
For a 3-person household:
- 50-gal electric: 50 (reservoir) + ~21 (one-hour recovery) = ~71 gph first-hour rating. Adequate for sequential 3-shower demand.
- 40-gal electric: 40 + ~21 = ~61 gph FHR. Tight for 3-person sequential demand; will run out during back-to-back showers.
For 2-person households, 40-gal electric is sufficient. For 3+, default to 50-gal.
Cold-climate considerations
In cold climates with groundwater below 50°F, electric tank recovery slows further (20% reduction at 40°F groundwater vs 60°F). Households in the Northeast, Midwest, and Mountain West with 3+ occupants should consider 66-gal or 80-gal electric instead of 50-gal — the larger reservoir compensates for slower recovery in winter.
The heat-pump option (Rheem ProTerra) is particularly compelling in cold climates IF the install location stays above 50°F year-round. A basement that drops to 45°F in January cuts heat-pump efficiency by half — the unit shifts to resistance-only mode. Verify install location ambient temperature year-round before committing.
Install considerations
Electric tank replacement is one of the simplest plumbing/electrical jobs in a residence:
- Standard 30A 240V circuit. Most existing electric tanks already have this — verify the circuit isn't shared with something else.
- Two heavy 10-AWG conductors plus ground from the panel to the unit.
- Standard NPT plumbing connections (3/4" cold and hot).
- No venting, no combustion air, no gas connection.
DIY is reasonable for any homeowner with electrical experience. Time: 2–3 hours for a first-timer, 90 minutes for someone who has done it before. Plumber-installed: $300–$500 in labor.