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Copper Tubes - Heat Losses

Heat loss from uninsulated copper tubes vs. temperature differences between tube and air.

Values from the table below can be used to indicate the heat losses from uninsulated copper pipes:

Copper Tubes - Heat Losses
Nominal boreHeat Loss
(W/m)(Btu/hr ft)
Temperature difference (oC)Temperature difference (oF)
(mm)(inches)223855406899
15 1/2 21 32 45 22 34 47
22 3/4 28 43 60 29 45 53
28 1 34 53 76 36 56 79
35 1 1/4 41 64 89 43 67 93
42 1 1/2 47 74 104 49 77 108
54 2 59 93 131 62 97 136
67 2 1/2 71 111 156 74 116 162
76 3 83 129 181 87 135 189
108 4 107 165 232 111 172 241
  • 1 W = 3.4 Btu/hr
  • 1 ft (foot) = 0.3048 m

Copper Tubes - Uninsulated heat loss

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