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Table 8: Water Boiler Supply & Return Pipe Sizes
Figure 31: Recommended Boiler Piping For
Combination Heating & Cooling Systems
Supply Supply Water Return Return Water
Boiler Header Riser Connections Header Connections
Model Size (in) Quantity Size (in) Size (in) Quantity Size (in)
32-475 2 1 2 2 1 2
32-570 2 1 2 2 1 2
32-665 2 1/2 1 2 1/2 2 1/2 1 2 1/2
32-760 2 1/2 1 2 1/2 2 1/2 1 2 1/2
32-855 2 1/2 1 2 1/2 2 1/2 1 2 1/2
32-950 3 1 3 3 1 3
32-1045 3 1 3 3 1 3
32-1140 3 1 3 3 1 3
32-1235 3 1 3 3 1 3
32-1330 3 1 3 3 1 3
32-1425 3 1 3 3 1 3
32-1520 3 2 2 1/2 3 2 2 1/2
32-1615 3 2 2 1/2 3 2 2 1/2
32-1710 3 2 2 1/2 3 2 2 1/2
32-1805 3 2 2 1/2 3 2 2 1/2
32-1900 3 2 3 3 2 3
32-1995 4 2 3 4 2 3
32-2090 4 2 3 4 2 3
32-2185 4 2 3 4 2 3
32-2280 4 2 3 4 2 3
32-2375 4 2 3 4 2 3
32-2470 4 2 3 4 2 3
32-2565 4 2 3 4 2 3
32-2660 4 2 3 4 2 3
32-2755 4 2 3 4 2 3
32-2850 4 2 3 4 2 3
Note: 1.The pipe sizes listed above are nominal trade sizes for Schedule 40