Tankless Water Heater Gas Supply Line Size

Like a hot water tank for 5 people will require at least a 60 gallon tank.

Tankless water heater gas supply line size.

Gallons per minute gpm is the key when it comes to sizing tankless water heaters. 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. Tables 2 and 3 provide the capacity by pipe size and length based on the maximum allowable pressure drops.

In all cases a near 200 000 btu gas appliance will require a minimum of a inch gas supply line. Cpc508 5 provide gas line sizing calculations and isometric riser diagram of the gas delivery piping system for the equipment with permit application. 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.