58 Heater Technical Information GAS SUPPLY AND PIPING: All GAS connections must be in conformance with all applicable local codes, regulations and the National Fuel Gas Code NFPA54/ANSIZ223-1 & ANSI/NFPA 58. To properly size the gas piping for the heater, refer to Tables 10, 11, 12, and 13, depending on natural or propane gas, and single-stage or 2-stage regulation. Follow local gas codes for proper gas line material selection (copper, iron, plastic, etc.). It is VERY IMPORTANT when installing a propane heater on a 2-stage regulation system, to follow the gas line sizing data in Tables 12 or 13 without exception. Table 10. Natural Gas Pipe Sizing (dia. inch), Low-Pressure, Single-Stage Regulation btu/hr input 135/150,000 200,000 250,000 300,000 350,000 400,000 500,000 Gas Line Material Iron or PlasticPipe Iron or PlasticPipe Iron or PlasticPipe Iron or PlasticPipe Iron or PlasticPipe Iron or PlasticPipe Iron or PlasticPipe Distance from Gas Meter to Gas Valve Inlet (ft.) 0 to 50 3⁄4" 1 1 1 1⁄4" 1 1⁄4" 1 1⁄4" 1 1⁄4" 50 to 100 1 1 1 1⁄4" 1 1⁄4" 1 1⁄4" 1 1⁄4" 1 1⁄2" 100 to 200 1 1⁄4" 1 1⁄4" 1 1⁄4" 1 1⁄2" 1 1⁄2" 1 1⁄2" 2 200 to 300 1 1⁄4" 1 1⁄4" 1 1⁄2" 2 2 2 2 Based upon an inlet gas pressure of 0.5 psig or less at a pressure drop of 0.5 inwc Table 11. Propane Gas Pipe Sizing (dia. inch), Low-Pressure, Single-Stage Regulation btu/hr input 135/150,000 200,000 250,000 300,000 350,000 400,000 500,000 Gas Line Material Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Distance from Tank Regulator to Gas Valve Inlet (ft.) 0 to 50 3⁄4" 7⁄8" 3⁄4" 7⁄8" 1 1 1⁄8" 1 1 1⁄8" 1 1 1⁄8" 1 — 1 — 50 to 100 3⁄4" 1 1⁄8" 1 1 1⁄8" 1 1 1⁄8" 1 — 1 1⁄4" — 1 1⁄4" — 1 1⁄4" — 100 to 200 1 1 1⁄8" 1 — 1 1⁄4" — 1 1⁄4" — 1 1⁄4" — 1 1⁄4" — 1 1⁄4" — 200 to 300 1 — 1 1⁄4" — 1 1⁄4" — 1 1⁄4" — 1 1⁄4" — 1 1⁄2" — 1 1⁄2" — Based upon an inlet gas pressure of 11 inwc at a pressure drop of 0.5 inwc Table 12. Natural Gas Pipe Sizing (dia. inch), High-Pressure, 2-Stage Regulation btu/hr input 135/150,000 200,000 250,000 300,000 350,000 400,000 500,000 Gas Line Material Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe Iron or Plastic Pipe Distance of 1st Stage then 2nd Stage to Gas Valve Inlet (ft.) First Stage* 0 to 50 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 50 to 100 1⁄2" 1⁄2" 1⁄2" 1⁄2" 3⁄4" 3⁄4" 3⁄4" 100 to 150 1⁄2" 1⁄2" 1⁄2" 3⁄4" 3⁄4" 3⁄4" 3⁄4" Second Stage** 0 to 10 3⁄4" 3⁄4" 3⁄4" 3⁄4" 3⁄4" 3⁄4" 1 *Based upon an inlet gas pressure of 2 psig at a pressure drop of 1 psi **Based upon an inlet gas pressure of 10 inwc at a pressure drop of 0.5 in-wc Table 13. Propane Gas Pipe Sizing (dia. inch), High-Pressure, 2-Stage Regulation btu/hr input 135/150,000 200,000 250,000 300,000 350,000 400,000 500,000 Gas Line Material Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Iron Pipe Tubing Distance of 1st Stage then 2nd Stage to Gas Valve Inlet (ft.) First Stage* 0 to 50 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 50 to 100 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 5⁄8" 1⁄2" 5⁄8" 1⁄2" 5⁄8" 100 to 150 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 1⁄2" 5⁄8" 1⁄2" 5⁄8" 1⁄2" 5⁄8" 1⁄2" 5⁄8" Second Stage** 0 to 10 1⁄2" 5⁄8" 1⁄2" 5⁄8" 1⁄2" 3⁄4" 3⁄4" 3⁄4" 3⁄4" 7⁄8" 3⁄4" 7⁄8" 3⁄4" 1 *Based upon an inlet gas pressure of 10 psig at a pressure drop of 1 psi **Based upon an inlet gas pressure of 11 inwc at a pressure drop of 0.5 inwc Electric Supply: All electrical wiring must be in conformance with all applicable local codes, regulations and the National Electric Code (NEC), in particular NEC Article 680 & 440. H e a t i n g
