Water Heater Gas Pipe Size

You can see that in a typical gas system a tankless water heater with a capacity of 199 900 btu will require a 1 inch pipe size for a 20 ft branch length based on the 0 3 in w c.

Water heater gas pipe size.

Add approximately 5 feet of pipe per fitting. Typically the gas piping has to be upgraded to support the tankless water heater due to the volume of fuel that is required. 2 stoves 1 hot water heater 1 furance 1 dryer and 1 gas space heater heating room in garage this line is run underground out to my garage and approx 100 ft away. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise.

A b c e h j k l or 8 10 8 9 20 14 14 2 85 feet. Total cfh load is 310. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. In all cases a near 200 000 btu gas appliance will require a minimum of a inch gas supply line.

What size gas supply line is. You can see that in a typical gas system a tankless water heater with a capacity of 199 900 btu will require a 1 inch pipe size for a 20 ft branch length based on the 0 3 in w c. Pressure drop in table 2. 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.

There are no 5 steps in the length chart so you have to go to the next higher column which is 90 feet. A machine with a burner that requires 440 000 btu would need a 1 1 4 pipe for a 20 long run. What size gas line does a rinnai tankless water heater require. Typical machine supply 5 7 pipe length must include additional length for all fittings.

Pressure drop in table 2. The same appliance would require just a pipe size based on table 4 the 3 0 in w c. One cubic foot of lp gas 1000 btu nominal pressure at the burner for natural gas is 3 5 of water column.