How Long Does it Take For a 40 Gallon Water Heater to Heat Up?

If you are like me and you are asking yourself, how long does it take for a 40 gallon water heater to heat up? I would imagine that you are going to have the same question as I had when I first decided to get a water heater. There is nothing worse than coming home after a hard day’s work and having cold water comes out of your tap in the middle of the night. This is when you start to wonder “how long does it take for a water heater to heat up?”