Water Heater Gas Supply Line Size

Measure the distance between the appliance and the gas supply and add three inches to be sure it s long enough.

Water heater gas supply line size.

For instance if a 1 inch pipe runs 30 then drops to 1 2 for 6 and then someone installed 3 4 pipe and ran an additional 40 feet the 40 feet of 3 4 pipe would all be considered 1 2. Now for the tankless water heater. An undersized gas line can stress a tankless system and possibly reduce its lifespan all rinnai tankless water heaters are equipped with technology that safely ceases operation if they detect an inadequate gas flow. What size gas line does a rinnai tankless water heater require.

10 ft supply run would run at 3 4. Supply run at 20 ft long that is black iron pipe. The braided stainless steel lines are available in different lengths from 12 in. In specific conditions a inch gas line may be used.

You will never get more gas through the 3 4 pipe than will pass thorough the 1 2 nipple. Plug in these values to the formula. Select a flexible supply line with a maximum flow rating capacity higher than the appliance s input rating. 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. Now look up this value on the 70 foot line of the table. Copper pipe would be different. Refer to the manufacturer s label on the appliance to identify the maximum gas input rating.

Ressure 7 14 incches water column 3 4 inch pipe is suitable for 326 000 btuh. Gas piping should be sized in accordance with the tables in the standard gas code or by other engineering methods approved by local authority having jurisdiction. The minimum pipe size capable of carrying 263 58 cfh is a 1 pipe. The btu hr input is 199 000.

In all cases a near 200 000 btu gas appliance will require a minimum of a inch gas supply line. Sharkbite water heater connectors will decrease the amount of time and effort needed to install a water heater in your home and are the fastest way to complete your project. When sizing the gas line make sure you add 5 feet per elbow to the total length. Without ball valve and are also available in corrugated stainless steel.