Usually most homeowners find that either a 40 or 50 gallon hot water tank is the best fit for their needs.
Average water heater size gallons.
1 2 people you ll need a water tank with at least a 30 gallon capacity.
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.
In this instance you would need a water heater with a first hour rating of at least 72 gallons before you run out of hot water during that 1 hour period.
To determine what size tankless water heater.
In most cases you would need a 50 gallon tank water heater in this situation considering most 40 gallon models have a lower fhr.
Consequently these are the two most frequently installed sizes.
3 4 people need a 40 50 gallon water heater.
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.
Choose a hot water heater with a tank size in the range of 50 to 60 gallons on the fhr label.
For 1 to 2 people.
This tank size based on the scenario in step 2 is adequate for the peak hourly hot water requirements.
An average shower will be between 104 106 and uses 2 6 gallons of water.
However every family has different water demand requirements.
But if you only need a loose estimate of what size you need versus an exact calculation follow these guidelines.
What size water heater do i need.
Utility water heaters usually range in size from 2 5 to 19 gallons.
A tankless water heaters flow rate should be equal to your family s peak demand.
5 or more people need a 50 80 gallon water heater.
Tankless water heaters capacities aren t measured in gallons stored but in flow rates.
Well to get an accurate answer you d have to calculate out how much hot water you typically use during your busiest hot water using hour.
2 3 people you ll need at least a 40 gallon capacity tank.
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.
30 40 gallons for 2 to 3 people.
Small storage tank water heaters known as point of use or utility water heaters are good choices for adding hot water to outbuildings shops or garages.
Together that equals 72 gallons of hot water needed.
If you re going with a storage tank water heater here s a rough guide for storage tank capacity.
