TableF: Boiler Temperatures and Minimum Pipe Size at Varying Return Temperatures
System
ReturnTemp SupplyTemp1SupplyTemp1SupplyTemp1
(°F) (°F) <80' equiv. 80-200'equiv. (°F) <80' equiv. 80-200'equiv. (°F) <80' equiv. 80-200'equiv.
60 138 2"NPT 2 1/2"NPT 147 2"NPT 2 1/2"NPT 154 2"NPT 2 1/2"NPT
80 138 2"NPT 2 1/2"NPT 147 2"NPT 2 1/2"NPT 154 2 1/2"NPT 3"NPT
100 138 2 1/2"NPT 3"NPT 147 2 1/2"NPT 3"NPT 154 2 1/2"NPT 3"NPT
120 145 2 1/2"NPT 3"NPT 158 2 1/2"NPT 3"NPT 170 2 1/2"NPT 3"NPT
140 165 2 1/2"NPT 3"NPT 178 2 1/2"NPT 3"NPT 190 2 1/2"NPT 3"NPT
160 185 2 1/2"NPT 3"NPT 198 2 1/2"NPT 3"NPT 210 2 1/2"NPT 3"NPT
1-Approximatehigh fire heater outlet temperature based on the standard heater pump and the recommended connectingpipe size.
Model1005
Minimum Pi
p
eSize2
Model 1505
Minimum Pi
p
eSize2
Model2005
Minimum Pi
p
eSize2
2-Minimum
p
i
p
esizebased on totale
q
uivalent feet of su
pp
l
y
andreturn
p
i
p
in
g
between the s
y
stemloo
p
andheater.
Fig. 14: Single Heater with Primary/Secondary Piping
Fig. 15: Dual Heaters (Reverse/Return)
with Primary/Secondary Piping
Fig. 16: Single Domestic Hot WaterHeater and Storage
Tank
16
Domestic Hot Water