Electric Instant Hot Water Heater 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.

Electric instant hot water heater sizing.

The right size is a tankless water heater that can heat enough gallons of water to a specific temperature per minute to keep up with the demand. Choose the right tankless electric water heater for you. Sizing storage and heat pump with tank water heaters. 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.

Rheem tankless electric water heaters make it easy to enjoy instantaneous continuous hot water space saving design and significant energy cost savings. Gas tankless water heaters are able to produce a larger temperature rise per gpm than electric models. If you want to upgrade your water heater size from 40 or 50 gallons storage water heater or replace it you won t necessarily need a big tankless water heater. Just follow the three simple steps below to choose the right model and size you need.

Having a water heater that is too small will result in it not being able to produce enough hot water for your household demand. This tool is intended only for use as a guide to the products we offer that meet certain criteria you may be looking for. 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. We already covered gpm.

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. Most demand water heaters are rated for a variety of inlet temperatures. Tankless water heater sizing calculator. 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. 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. 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. Size matters when it comes to your tankless water heater.

Pro size is intended to assist in selecting water heaters or boilers that best meet the specific job requirements. Smith pro size sizing program is a tool that can be used to estimate water heater requirements for many common applications.