Tankless Water Heater Gas Supply Line Size

Tables 2 and 3 provide the capacity by pipe size and length based on the maximum allowable pressure drops.

Tankless water heater gas supply line size.

In all cases a near 200 000 btu gas appliance will require a minimum of a inch gas supply line. 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. 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. Branch 1 e tankless water heater 199 900 20 ft 1 g gas furnace 75 000 15 ft d branch main line 274 900 30 ft 1 branch 2 j gas dryer 25 000 20 ft h gas range 55 000 30 ft k gas logs 40 000 10 ft b c branch main line 120 000 45 ft main trunk a main trunk line 394 900 20 ft 1.

Gallons per minute gpm is the key when it comes to sizing tankless water heaters. Like a hot water tank for 5 people will require at least a 60 gallon tank. 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. Typically the gas piping has to be upgraded to support the tankless water heater due to the volume of fuel that is required.