Water Heater Sizes

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.

Water heater sizes.

Usually most homeowners find that either a 40 or 50 gallon hot water tank is the best fit for their needs. If your plan to use 5 or more fixtures at once you may need multiple tankless units in sequence. 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. Consequently these are the two most frequently installed sizes.

Utility water heaters usually range in size from 2 5 to 19 gallons. 1 2 fixtures at once you ll need at least 3 5 gpm. 3 4 fixtures at once you ll need at least 7 gpm. Mobile homes require water heaters specifically made for this type of dwelling.

For a tank style heater household size is a simple indicator of hot water needs. You can estimate the necessary tank capacity in gallons based on the number of people in the house. Typically residential water heater sizes range from 40 to 100 gallon tanks. This is the balance between how much water your water heater can store and how quickly it can reheat the water in its tank.

Sizing storage and heat pump with tank water heaters. What size water heater do i need. Water heater recovery rate. 2 3 fixtures at once you ll need at least 5 gpm.

The largest of these miniature units can also be used to provide hot water to secondary bathrooms that may be situated far from your home s main water heater.