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What To Consider Before Purchasing A Propane Tankless Water Heater - Propane Line Sizing

Check to make sure your propane line is sized properly.  Tankless water heaters draw many more BTU's than a tank water heater, so you will want to make sure your propane line is of the proper size and the distance the propane line is run is not too long, so the unit will function properly.  Below are tables that show the maximum propane line run by diameter for natural propane, propane (LP) with black iron pipe and propane (LP) with copper tubing.  If any other applications are sharing the line or for more specific information, please consult the National Code Fuel Chart.

Maximum length of black iron pipe run for Liquid Propane (LP)

Model Nominal Iron Pipe Size (diameter)
3/8" 1/2" 3/4" 1"
38B 10 ft 160 ft
1000P 100 ft 160 ft
1600P/125B,
1600H/125HX
40 ft 150 ft 150 ft
125FX 35 ft 150 ft 150 ft
RTG-53 30 ft 125 ft 150 ft
2400E, 2400EO/250SX 20 ft 80 ft 150 ft
RTG-74, GT-199 15 ft 65 ft 150 ft

 

Propane Venting Requirements
Propane Line Sizing Requirements
Propane Combustion Air Requirements

 

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