What Size Tankless Water Heater Do I Need For A Family Of 3

Tankless water heaters are rated by the maximum temperature rise possible at a given flow rate.

What size tankless water heater do i need for a family of 3. What size water heater do i need. 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. So i need to know what size tankless water heater is best for a family of 4. To reduce flow rates install low flow water fixtures.

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. Looks like the rinnai ruc98in from amazon is going to be best to suit my needs. 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. It is listed as being 9 8gpm but since my factors are not the best case scenario it drops down to 6 7 gpm.

There the tankless heater has to work extra hard to bring the water temperature up to 110 f or 120 f. 1 2 people you ll need a water tank with at least a 30 gallon capacity. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. 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.

The first factor in choosing a tankless water heater is calculating the size of your hot water heater. 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. If you re going with a storage tank water heater here s a rough guide for storage tank capacity. The flow rate through the demand water heater would need to be at least 3 25 gallons 12 3 liters per minute.

How to size a tankless water heater. Simply locate the appropriate water heater sizes on ecomfort using your information. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. 2 3 people you ll need at least a 40 gallon capacity tank.