Getting the proper sized heater requires a Goldilocks equation. If you get one that’s too small, you risk running out of hot water in the middle of a shower. If you get one that’s too big, on the other hand, you’re wasting valuable money heating water that you’re not using.
So how to do find the “just right” heater? Take a look at its first hour rating.
Understanding First Hour Rating
To properly assess what size of water heater you need, it’s important to look at the unit’s first hour rating (FHR), which is the amount of hot water that a heater can continuously provide per hour before the tank runs empty.
Here’s another way of looking at it: How long can your heater provide hot water during a busy hour of the day, such as in the morning when your entire family gets ready for work or school. Read more from this blog. http://bit.ly/2gCAKC4
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