35
12.1 Antifreeze added to boilers
must be nontoxic,
and must be of type specifically intended for use in closed
hydronic heating systems. Under no circumstances should
automotive antifreeze be used. Antifreeze used in any
boiler may reduce capacity by 10% or more and increase
fuel consumption. See Table 6 and 7.
Table 6 - BOILER WATER VOLUMES
Number of
Boiler Section
Total Volume
(Gallons)
4
3.6
5
4.3
6
5.1
7
5.9
Table 7 - PIPING WATER VOLUMES
PIPE SIZE
COPPER
PIPE
FACTOR
STEEL PIPE
FACTOR
½”
82.5
63.5
¾”
40.0
36.0
1”
23.3
22.2
1 ¼”
15.3
12.8
1 ½”
10.8
9.5
2”
6.2
5.8
Divide total length of piping in feet by
appropriate factor in table to determine volume
in gallons.
12 - ANTIFREEZE IN THE SYSTEM
PN 240013415 REV A [08/15/2021]
