Marathon Lifetime 40-Gallon Electric Water Heater
Marathon Lifetime 40-Gallon Electric Water Heater Review
The Marathon Lifetime 40-Gallon Electric is the smaller-capacity variant of the Marathon polybuthylene-tank electric water heater. Lifetime tank warranty applies. Sized for 1-2 person households or installs where 50-gallon dimensions don't fit.
Specs: 40 gallons stored, two 4500W heating elements (240V), UEF 0.93, 52-gallon FHR, lifetime tank warranty + 6-year parts warranty. Polybuthylene fiberglass-reinforced plastic tank. NiCu-coated heating elements.
The 40-gallon Marathon serves single-person households or 1-2 person installs where the smaller capacity matches demand and the lifetime warranty justifies the premium price ($1,649 vs $499 for standard Rheem Performance 40-gal Electric).
The math works for households intending to stay 12+ years. Marathon's lifetime warranty means no replacement event during normal ownership. For shorter ownership horizons, standard Rheem Performance Electric is the better economic choice.
About $1,649 unit, $2,200 installed.
- No combustion, no venting required — installs anywhere with 240V electrical access
- Strong UEF 0.93 efficiency — approximately 20% lower annual operating cost vs 0.62 standard
- 99-year warranty — top-tier coverage for residential water heaters
- Resistance electric has slower recovery than gas at comparable capacity — schedule heavy use to match tank recovery