Electric Instant Hot Water Heater Sizing

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.

Electric instant hot water heater sizing.

Tankless water heaters are intended to heat potable drinking water only and the inlet water to a tankless unit should not be pre heated. Choose the right tankless electric water heater for you. 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. Rheem performance tankless electric water heaters help reduce rheem performance tankless electric water heaters help reduce energy usage save on energy costs and provide the comfort and convenience of continuous hot water on demand.

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. Sizing storage and heat pump with tank water heaters. Gas tankless water heaters are able to produce a larger temperature rise per gpm than electric models. Now you need to understand what temperature rise means.

Most demand water heaters are rated for a variety of inlet temperatures. Just follow the three simple steps below to choose the right model and size you need. This tool is intended only for use as a guide to the products we offer that meet certain criteria you may be looking for. We already covered gpm.

Our whole home models are a perfect match for installations in small spaces and no venting is required. Smith pro size sizing program is a tool that can be used to estimate water heater requirements for many common applications. 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. Tankless water heater sizing calculator.

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. In fact it is the most important part of choosing a new unit for your home. Rheem tankless electric water heaters make it easy to enjoy instantaneous continuous hot water space saving design and significant energy cost savings. 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.

Having a water heater that is too small will result in it not being able to produce enough hot water for your household demand. 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.