30 40 gallons for 2 to 3 people.
Average water heater size gallons.
1 2 people you ll need a water tank with at least a 30 gallon capacity.
Typically residential water heater sizes range from 40 to 100 gallon tanks.
For 1 to 2 people.
Together that equals 72 gallons of hot water needed.
Consequently these are the two most frequently installed sizes.
2 3 people you ll need at least a 40 gallon capacity tank.
What size water heater do i need.
To determine what size tankless water heater.
Tankless water heaters capacities aren t measured in gallons stored but in flow rates.
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.
Utility water heaters usually range in size from 2 5 to 19 gallons.
An average shower will be between 104 106 and uses 2 6 gallons of water.
A tankless water heaters flow rate should be equal to your family s peak demand.
This tank size based on the scenario in step 2 is adequate for the peak hourly hot water requirements.
Usually most homeowners find that either a 40 or 50 gallon hot water tank is the best fit for their needs.
In most cases you would need a 50 gallon tank water heater in this situation considering most 40 gallon models have a lower fhr.
3 4 people need a 40 50 gallon water heater.
However every family has different water demand requirements.
Choose a hot water heater with a tank size in the range of 50 to 60 gallons on the fhr label.
Sizing storage and heat pump with tank water heaters.
If you re going with a storage tank water heater here s a rough guide for storage tank capacity.
Assuming your water temperature is 40 coming into your home and you want to produce enough hot water to run 2 showers at the same time what temperature rise would you need to produce to accomplish this.
You can estimate the necessary tank capacity in gallons based on the number of people in the house.
5 or more people need a 50 80 gallon water heater.
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.
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.
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.
