What Size Tankless Water Heater Do I Need For A Family Of 5

Looks like the rinnai ruc98in from amazon is going to be best to suit my needs.

What size tankless water heater do i need for a family of 5. The first factor in choosing a tankless water heater is calculating the size of your hot water heater. 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. 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. Simply locate the appropriate water heater sizes on ecomfort using your information.

Tankless water heaters are rated by the maximum temperature rise possible at a given flow rate. So to determine the right size of a tankless water heater for a family of 5 you ll need to calculate the peak flow rate in your house. It is listed as being 9 8gpm but since my factors are not the best case scenario it drops down to 6 7 gpm. While traditional tank water heaters are calculated by your family size a tankless water heater is calculated by the quantity and types of fixtures or appliances it will serve.

Therefore to size a demand water heater you need to determine the flow rate and the temperature rise you ll need for its application whole house or a remote application such as just a bathroom in your home. How to size a tankless water heater. So i need to know what size tankless water heater is best for a family of 4. If your family size is 5 or more you ll need an 80 gallon tank electric or a 50 gallon tank natural gas or liquid propane.

In short a family of 5 would need a 10 gpm gas tankless heater or 27 kw electric tankless heater if you live in the northern part of the usa where the input water has a lower temperature. Sizing storage and heat pump with tank water heaters. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. There the tankless heater has to work extra hard to bring the water temperature up to 110 f or 120 f.

And find a tankless model that would be able to handle the load at the needed temperature rise. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. For example if your peak usage occurs after dinner when you re running the dishwasher and taking a shower at the same time 3 gpm 2 5 gpm you ll need a tankless water heater with a.