Natural Gas Supply Piping

Gas Supply Piping

Check the rating plate to make sure that the unit was built for the type of gas available in the area.

The gas supply piping should be sized according to the Applicable Plumbing Code for a maximum draw of 185,000 BTUH. First determine the effective length of the gas supply line by measuring the actual length of piping, and then adding 5 ft. for every elbow or “T” to the actual length. Use the charts below to determine the pipe diameter necessary to accommodate the BTU demand of the unit. If there are more gas drawing appliances on the line, size according to the maximum amount of BTU demand.

The gas supply pressures must be within the ranges of the following chart:

Natural Gas	Min. 5” WC
Supply Pressure	Max. 10.5” WC
Propane Gas	Min. 11” WC
Supply Pressure	Max. 14” WC

Insufficient gas supply pressure can cause the Flash Water Heater to lose efficiency or not work at all.

WARNING: Fire or explosion may result if the maximum supply pressures are exceeded. The manifold gas pressure should be at maximum 2.3” WC for natural gas, and 2.5” WC for propane.

Always use approved connectors to connect the unit to the gas line. Always purge the gas line of any debris before connecting to the water heater.

WARNING: Conversion of this unit from natural gas to propane or propane to natural gas cannot be done in the field. Contact your local retailer or distributor to get the correct unit for your gas type.

Always install a manual shutoff valve on the gas supply line in case of an emergency, or if service or maintenance is necessary.

This appliance and its individual shut-off valve must be isolated from the gas supply piping system by unplugging the unit and turning off the main gas valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ PSI.

When all of the connections have been made, check the gas line for leaks. Apply soapy water to all gas fittings and connections, if bubbles form, there may be a leak.

Based on 0.60 specific gravity for natural gas at .5” WC pressure drop

DOE standard is 1100 BTU per cubic ft. of natural gas

Pipe
Size					Cubic Feet of Natural Gas
Length	10’	20’	30’	40’	50’	60’	70’	80’	90’	100’	125’	150’	200’
½”	174	119	96	82	73	66	61	56	53	50	44	40	34
¾”	363	249	200	171	152	138	127	118	111	104	93	84	72
1”	684	470	377	323	286	259	239	222	208	197	174	158	135
1 ¼”	1404	965	775	663	588	532	490	456	428	404	358	324	278
1 ½”	2103	1445	1161	993	880	798	734	683	641	605	536	486	416
2”	4050	2784	2235	1913	1696	1536	1413	1315	1234	1165	1033	936	801

Propane Supply Piping

Based on 11” WC supply pressure

Pipe
Size						kBTU of Propane
Length	10’	20’	30’	40’	50’	60’	70’	80’	90’	100’	125’	150’	200’
½”	275	189	152	129	114	103	96	89	83	78	69	63	55
¾”	567	393	315	267	237	217	196	185	173	162	146	132	112
1”	1071	732	590	504	448	409	378	346	322	307	275	252	213
1 ¼”	2205	1496	1212	1039	913	834	771	724	677	630	567	511	440
1 ½”	3307	2299	1858	1559	1417	1275	1181	1086	1023	976	866	787	675
2”	6221	4331	3465	2992	2646	2394	2205	2047	1921	1811	1606	1496	1260

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