Store All Water Heater Prices Include Installation. Unsure which water heater you need? Learn more here. Electric Water Heaters Store / Electric Water Heaters Rheem Electric 20 Gallon 6-Year Performance Tank Water Heater Rheem Electric 20 Gallon 6-Year Performance Tank Water Heater (Installed Price) $1,470.95 Rheem Electric 30 Gallon 6-Year Performance Tank Water Heater Rheem Electric 30 Gallon 6-Year Performance Tank Water Heater (Installed Price) $1,525.95 Rheem Electric 40 Gallon 6-Year Performance Tank Water Heater Rheem Electric 40 Gallon 6-Year Performance Tank Water Heater (Installed Price) $1,481.95 Rheem Electric 40 Gallon 9-Year Performance Plus Tank Water Heater Rheem Electric 40 Gallon 9-Year Performance Plus Tank Water Heater (Installed Price) $1,592.95 Rheem Electric 40 Gallon 12-Year Performance Platinum Gladiator Tank Water Heater Rheem Electric 40 Gallon 12-Year Performance Platinum Gladiator Tank Water Heater (Installed Price) $1,798.95 Rheem Electric 50 Gallon 6-Year Performance Tank Water Heater Rheem Electric 50 Gallon 6-Year Performance Tank Water Heater (Installed Price) $1,588.95 Rheem Electric 50 Gallon 9-Year Performance Plus Tank Water Heater Rheem Electric 50 Gallon 9-Year Performance Plus Tank Water Heater (Installed Price) $1,711.95 Rheem Electric 50 Gallon 12-Year Performance Platinum Gladiator Tank Water Heater Rheem Electric 50 Gallon 12-Year Performance Platinum Gladiator Tank Water Heater (Installed Price) $2,085.95