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The heat loss from an insulated copper pipe or tube to the surrounding air can be found in the table below. The heat loss is based on a temperature difference of 55oC (130oF) with an insulation thickness of 25 mm (1 inch) and a conductivity coefficient of k = 0.043 W/m oC (0.3 Btu in/ft2 hr oF).
| Nominal bore | Heat loss for fluid inside pipe | ||
| (mm) | (inches) | (W/m) | (Btu/hr ft) |
| 22 | 3/4 | 8 | 8 |
| 28 | 1 | 10 | 10 |
| 42 | 1 1/2 | 11.5 | 12 |
| 54 | 2 | 14.5 | 15 |
| 67 | 2 1/2 | 16 | 17 |
| 76 | 3 | 19 | 20 |
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