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# Copper Tubes - Heat Carrying Capacities

## Hot water heat carrying capacities in copper tubes type L.

Copper tubes are often used in hot water heating systems, especially to connect heating elements like radiators, fan units and similar to the main pipe lines.

The table below can be used to estimate hot water heat carrying capacity in copper tubes type L:

For full table - rotate the screen!

Hot Water Heat Carrying Capacity in Type L Copper Tube
Nominal tube size (inch)Heat Carrying Capacity (103 Btu/hr) 1)
Friction Head (10-3 inH2O/ft of tube)
920600480360300240180150120907560
3/8 10 9 8 7 6 5.5 4.5 4 3.5 3 3 2.5
1/2 20 18 16 13.5 12 11 9 8 7 6 5 5
5/8 36 30 26 22 20 18 15 13 12 10 9 8
3/4 51 46 40 34 31 28 23 21 18 15 14 12
1 104 94 82 70 63 56 47 42 37 32 28 25
1 1/4 185 169 149 125 112 100 84 75 66 56 50 44
1 1/2 300 270 235 200 180 160 134 120 105 90 81 71
2 625 560 495 420 375 335 258 250 200 188 170 150
2 1/2 1130 1010 890 750 680 600 500 450 395 335 305 270
3 1840 1650 1450 1210 1100 980 820 740 650 550 490 420
3 1/2 2750 2480 2170 1840 1650 1450 1210 1100 980 820 740 650
4 3900 3500 3100 2600 2350 2090 1760 1580 1390 1180 1080 950

1) The table is designed for temperature drop 20 oF (11 oC) in radiators and heating elements. For other temperature drops the values must be changed accordingly. With temperature drop 10 oF (5.5 oC) - multiply the capacities with 0.5.

• 1 in (inch) = 25.4 mm

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## Citation

• The Engineering ToolBox (2003). Copper Tubes - Heat Carrying Capacities. [online] Available at: https://www.engineeringtoolbox.com/copper-tubes-heat-capacity-d_476.html [Accessed Day Month Year].

Modify the access date according your visit.

8.21.8

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