Tankless Water Heater Gas Supply Line Size

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.

Tankless water heater gas supply line size.

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. 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. Gallons per minute gpm is the key when it comes to sizing tankless water heaters. 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.

Tables 2 and 3 provide the capacity by pipe size and length based on the maximum allowable pressure drops. Typically the gas piping has to be upgraded to support the tankless water heater due to the volume of fuel that is required. In all cases a near 200 000 btu gas appliance will require a minimum of a inch gas supply line. Like a hot water tank for 5 people will require at least a 60 gallon tank.