Tankless Gas Water Heater Sizes

Rheem tankless electric water heaters make it easy to enjoy instantaneous continuous hot water space saving design and significant energy cost savings.

Tankless gas water heater sizes.

Like a hot water tank for 5 people will require at least a 60 gallon tank. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. Rinnai super high efficiency plus 9 8 gpm indoor natural gas tankless water heater. How to determine the required size of a tankless hot water heater.

You ll need to raise the incoming water temperature from 40 degrees to 105. 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 you ll need a tankless water heater that can produce at least a 60 degree rise in temperature at 5 2 gallons per minute. Tankless water heaters are much smaller than units with a storage tank allowing them to be wall mounted.

Use our handy calculator to determine your needed flow rate and temperature rise then find models that match your needs. Determine the mounting space. 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. Just follow the three simple steps below to choose the right model and size you need.

Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. You ll need to be able to heat at least 5 2 gallons of water. Gallons per minute gpm is the key when it comes to sizing tankless water heaters. Looking to purchase a new tankless water heater but having trouble figuring out what size or model you need.

Determine your water flow rates. Measure your cold water temperature. 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.