It will take about 20-30 minutes for a 40-gallon water tank to fill up. Meanwhile, an 80-gallon tank takes about 30-40 minutes to fill up. But how does a water heater fill up, and why may a water heater not fill up at all? We'll attempt to answer those questions below, as well as how much energy a water heater uses.. The time it takes for a water heater to heat back up depends on several factors such as its type, size, and the energy source used. On average, gas tank water heaters take about 30-40 minutes, electric tank water heaters take 60-80 minutes, propane storage tank water heaters take 30-40 minutes, and tankless water heaters (both propane and.
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The initial temperature of the water in the tank will also affect the reheating time. The colder the water, the longer it takes to heat up. 6. Flow Rate. The flow rate of the water when it enters the tank also affects the reheating time. A higher flow rate will take longer to heat up, while a lower flow rate will take less time. 7. Energy Source. Heating time depends on water heater type: Gas heaters take 30-70 minutes, electric heaters take 70-120 minutes, and tankless heaters take less than a minute. Factors influencing heating time include the first-hour rating, water heater size, inlet water temperature, and fuel type. Sediment buildup in the tank can cause longer heating times.
