# What Size Gas Supply To Water Heater?

## How do you size a gas supply line?

(1) Measure the length of the pipe from the gas meter location to the most remote outlet on the system. (2) Locate that total length in the left-hand column of sizing table*, or the next longer distance where the table does not give the exact length.

## How many BTU can a 3/4 gas line carry?

Total piping length = 84 feet (use Table 3 @90 feet) From a to b, demand = 38,000 + 35,000 + 30,000 = 103,000 BTU/hr; use 3/4″ pipe From b to c, demand = 38,000 + 35,000 = 73,000 BTU/hr; use 1/2″ pipe or 3/4″ tubing From c to d, demand = 35,000 BTU/hr; use 1/2″ pipe or 5/8″ tubing From c to e, demand = 38,000 BTU/hr;

## How far can you run 1/2 inch gas line?

This chart allows a 200,000 BTU gas appliance to be installed on a ½-inch gas line up to 40 ft. in length. However, the following conditions must be met: The minimum static gas pressure must be 8 in.

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## Can a gas line be too big?

GAS PIPE SIZING You can flow only so much gas (or water) through a given pipe size, so restrictions will manifest themselves as a lack of pressure or volume. Sizing a gas line is not too difficult.

## What size gas line do I need for a 22kw generator?

A 3/4” line will feed alot of appliances. The secondary regulator at generator drops the pressure for appliance. It has a regulator at the tank and then goes to this 3/4″ black hose which then goes down to a yellow 3/4″ plastic pipe.

## What size gas line is needed for tankless water heater?

Rinnai Tankless Water Heaters typically require a 3/4″ gas line to provide a sufficient gas supply to the unit’s burner. However, if there is sufficient pressure and the gas line is short enough, there are some cases where a 1/2″ gas line can be used, which is the most common size used in the United States and Canada.

## How many Btus can a 3/4 copper pipe carry?

3/4″ Pipe = 3.5 GPM = 35,000 BTU/hr. 1″ Pipe = 7.5 GPM = 75,000 BTU/hr. 1-1/4″ Pipe = 12 GPM = 120,000 BTU/hr.

## What happens if gas line is too small?

IF the gas line were too small, the burner AND pilot would go out, and then you would not have enough hot water until your relighted it. 2. An indirect heater does NOT get “free heat” and if the boiler is not adequate for the heating AND hot water demands the performance will be less than desired. 3.

## Can I run my own gas line?

Yes in most jurisdictions you can. It’s a very good DIY project and it can be done very safely. First you need to obtain the proper permit. Never attempt to do work on, or install gas piping without first checking with local code authorities and obtaining the proper permits.

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## How far can you run flexible gas line?

The flexible connector length usually is limited to 3 feet except for gas ranges and clothes dryers. For these appliances, 6 feet generally is allowed. Splicing or joining connectors with nipples often is prohibited.

## What size pipe do I need for natural gas?

Section 1, supplying outlets A and B, or 35 cubic feet per hour requires ½ inch pipe. Section 2, supplying outlets A, B, and C, or 94 cubic feet per hour requires 3/4 inch pipe. Section 3, supplying outlets A, B, C, and D, or 230 cubic feet per hour, requires 1 inch pipe.

## How do I know if my gas line is big enough?

Observe how many “branches” the gas line has. If a gas line branches out many times, this lowers the pipe’s BTU capacity. There’s no perfect formula for how the branches may affect 3/4″ gas line capacity. For every branch, play it safe by adding six inches to your pipe length total.

## Why is black pipe used for gas lines?

The primary purpose of black steel pipe is to carry natural gas into homes and businesses. The pipe is manufactured without a seam, making it a stronger and safer pipe to carry gas. The black steel pipe is also used for fire sprinkler systems because it is more fire-resistant than galvanized pipe.