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.

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

Cpc508 5 provide gas line sizing calculations and isometric riser diagram of the gas delivery piping system for the equipment with permit application. Like a hot water tank for 5 people will require at least a 60 gallon tank. Typically the gas piping has to be upgraded to support the tankless water heater due to the volume of fuel that is required. Water heaters located in the garage may terminate on the garage floor with the same distance requirements cpc 505 6 cpc 505 4 508 5 608 5 t p does not discharge into a water heater drain pan.