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Sizing circulator pumps in a hydronic system Many people struggle when it comes to figuring what circulator pumps to use in any given hydronic heating system. Oversizing a circulator may cause excessive pressures, noise, damage and premature wear of all components, and a waste of energy. Under sizing one can result in unacceptably high temperature...

Values are for 4f/s flow of water Pipe TypeMax. GPMMax. BTU/h @ 15°F ΔTMax. BTU/h @ 20°F ΔTMax. BTU/h @ 25°F ΔTMax. BTU/h @ 30°F ΔT 1/2" M Copper3.224,00032,00040,00048,000 3/4" M Copper6.548,75065,00081,25097,500 1" M Copper10.981,750109,000136,250163,500 1-1/4" M Copper16.3122,250163,000203,750244,500 1-1/2" M Copper22.9171,500229,000286,250343,500 2" M Copper39.6297,000396,000495,000594,000 2-1/2" M Copper61.1458,250611,000763,750916,500 3" M Copper87.1653,250871,0001088,7501,306,500 4" M Copper1591,192,5001,590,0001,987,5002,385,000 3/8" PEX1.39,75013,00016,25019,500...