Tankless Gas Water Heater Sizes

Looking to purchase a new tankless water heater but having trouble figuring out what size or model you need.

Tankless gas water heater sizes.

Measure your cold water temperature. Since tankless water heaters supply endless hot water you don t have to worry about capacity but instead think in terms of water flow rate. You ll need to be able to heat at least 5 2 gallons of water. Choose the right tankless electric water heater for you.

Rheem tankless electric water heaters make it easy to enjoy instantaneous continuous hot water space saving design and significant energy cost savings. Rinnai super high efficiency plus 9 8 gpm indoor natural gas tankless water heater. Rinnai tankless water heaters are designed to provide maximum performance and efficiency using either a 3 4 or 1 2 gas line as long as sufficient gas flow is available. Like a hot water tank for 5 people will require at least a 60 gallon tank.

Tankless water heaters are much smaller than units with a storage tank allowing them to be wall mounted. How to determine the required size of a tankless hot water heater. 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. Simply locate the appropriate water heater sizes on ecomfort using your information.

So you ll need a tankless water heater that can produce at least a 60 degree rise in temperature at 5 2 gallons per minute. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. Determine your water flow rates. 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.

Use our handy calculator to determine your needed flow rate and temperature rise then find models that match your needs. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. Gallons per minute gpm is the key when it comes to sizing tankless water heaters.