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Insulated Copper Tubes - Heat Loss

Heat loss to surrounding air from insulated copper tubes.

The heat loss from insulated copper pipes or tubes to surrounding air are indicated below. The heat loss is based on temperature difference 55^oC (99^oF) with insulation thickness 25 mm (1 inch) and conductivity coefficient k = 0.043 W/m^oC (0.3 Btu in/ft²hr^oF).

Insulated Copper Tubes - Heat Loss
Nominal bore		Heat Loss
(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

1 W = 3.4 Btu/hr
1 ft (foot) = 0.3048 m

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