how long to replace a water heater
But replacing a water heater is not extremely hard, and if you follow this tutorial you'll be back in hot water in no time. Well, plan on a good 4 to 6 hours anyway. Selecting Your New Water Heater. When selecting your new water heater it's easiest to keep the same fuel type, whether gas or electric. That is the assumption made in this tutorial, that you'll keep the same fuel type as the water heater you're replacing.