17
IM-BW4-5-02
[240013014 Rev. B [12/15/2020]
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. Tankless coil performance
will fall as concentration of antifreeze is increased. Refer
to boiler and piping water volumes tables.
BOILER WATER VOLUMES
Number of
Boiler Section
Total Volume
(Gallons)
3
9.6
4
11.6
5
13.7
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.
ANTIFREEZE IN THE SYSTEM
