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While this is not exact, it is typically based on heating 1 full tank from 45F to 120F. Most 40 and 50 gallon units require 40 minutes to 1 hour. Between 30 minutes and 1 hour. Depending on amount of water used before and age of heater. This depends on age and how many gallons it is heating. If it is new & just filled or you ran out of hot water, About an hour. 3kW electric on a 50 gal tank (US) = 10,236 BtuH on 400 lb water. Since 1 BtuH = 1 lb water/1 degree F/Hr then 10,236 BtuH will heat 400 lb by about 25 deg F. in one hour. If you fill the tank completely with cold water at 40 deg F and want it at 140 deg F, then it will take about 4 Hr. Same tank on natural gas at 50,000 BtuH will take about 45 min.
When your water heater begins to leak, you have to replace it fast. We'll show you how to install your own gas water heater in less than a day. Even if you don't need a new water heater right now, chances are you will within the next few years. Water heaters tend to last seven to 15 years.ost residential water heaters cost $150 to $400 for either gas or electric, plus $200 to $450 if you have a plumber install it. More expensive gas water heaters with special venting systems also are available. But they're more difficult to install, and we won't deal with them here.