Heat Loss of Insulated Copper Pipes

For temperature difference 55°C (100°F)

For 25 mm thick insulation with k = 0.043 W/m°C (0.3 Btu/in ft² hr °F)

**Heat loss**
Nominal bore in	mm	W/m	Btu/hr ft
¾	22	8	8
1	28	10	10
1 1/2	42	11.5	12
2	54	14.5	15
2 1/2	67	16	17
3	76	19	20