Quick Steps to find your new residential water heater What to buy, where to buy, Rebates and tax credits, energy savings, self-install help and plumbing services. Time to Repair or Replace my water heater? My replacement options check out ENERGY STAR certified water heaters Select the size of your new water heater Water heater type Family 1 to 2 persons Family 2 to 3 persons Family 3 to 4 persons Family 5 Or More Persons Gas Tank Water Heater 30 Gallons 40 Gallons 40 gallons 50 Gallons Electric Tank Water Heater 30 Gallons 40 Gallons 50 Gallons 80 Gallons