We already covered gpm.
Instantaneous water heater electric sizing.
To properly size a storage water heater for your home including a heat pump water heater with a tank use the water heater s first hour rating.
The goal is to provide hot water for a full bathroom with one sink and a standard shower.
Before we get to how to use the calculator to size a tankless water heater let s talk about the factors that go into understanding what size inline water heater you need.
Gas tankless water heaters are able to produce a larger temperature rise per gpm than electric models.
In fact it is the most important part of choosing a new unit for your home.
The first hour rating is the number of gallons of hot water the heater can supply per hour starting with a tank full of hot water.
Now you need to understand what temperature rise means.
Tankless water heaters are intended to heat potable drinking water only and the inlet water to a tankless unit should not be pre heated.
This tool is intended only for use as a guide to the products we offer that meet certain criteria you may be looking for.
Choose the right tankless electric water heater for you.
The application would be point of use with only cold water lines running to the addition.
Rheem tankless electric water heaters make it easy to enjoy instantaneous continuous hot water space saving design and significant energy cost savings.
At eemax our goal is to design and build safe efficient code compliant tankless and miniature tank electric water heaters that support sustainable innovative service water heating solutions for residential commercial light industrial and safety applications.
Just follow the three simple steps below to choose the right model and size you need.
Our whole home gas and electric models are great for homes with busy families homes with luxury bathrooms and vacation homes while our point of use electric models are ideal for a single faucet or shower.
Tankless water heater sizing calculator.
For example an electric tankless heater that is rated at raising the water temperature 55 degrees at 1 5 gpm will supply you with a 120 degree temperature if the incoming water is 65 f or higher.
Size matters when it comes to your tankless water heater.
Leading the evolution of water heating.
The tankless water heaters shown here may or may not be suitable for your application depending on other factors such as wiring electrical needs home plumbing configuration water quality and more.
Having a water heater that is too small will result in it not being able to produce enough hot water for your household demand.
Most demand water heaters are rated for a variety of inlet temperatures.
For example you might not be able to run more than one shower at a time without someone getting an arctic blast of cold water.