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Antifreeze added to boilers must be nontoxic, and
must be of type specifi cally 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
3
4
5
SYSTEM PIPING ARRANGEMENT
Total Volume
(Gallons)
9.6
11.6
13.7
PIPING WATER VOLUMES
COPPER PIPE
PIPE SIZE
½"
¾"
1"
1 ¼"
1 ½"
2"
Divide total length of piping in feet by appropriate factor
in table to determine volume in gallons.
15
STEEL PIPE
FACTOR
FACTOR
82.5
63.5
40.0
36.0
23.3
22.2
15.3
12.8
10.8
9.5
6.2
5.8
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