Warning
Water quality has a significant impact on the lifetime and performance of a boiler's
heat exchanger.
Improperly prepared water in a heating circuit may cause damage to the heat
exchanger through fouling or corrosion. Repeated or uncontrolled water fills will
increase the potential for damage.
High levels of dissolved solids or minerals may precipitate out of the fluid onto the
hottest part of the heat exchanger, impairing heat transfer and resulting in overheating
and premature failure. The amount of solids that may form on the heat exchanger will
depend on the degree of hardness and the total water volume in the system. A high
water volume system with a low hardness count may cause as much damage as a
system with less volume and higher hardness, so it is recommended to treat water so
as to remove all dissolved solids. Other water chemistry allowable limits are as
follows:
Acidity pH is to be between 6.6 and 8.5
Chloride is to be less than 125 mg/l
Iron is to be less than 0.3 mg/l
Cu less than 0.1 mg/l
Conductivity is to be less than 400μS/cm (at 77°F [25°C])
7 grains/ gal (120 ppm)
Important: Ensure that these limits are acceptable for the other water-side
components in the system.
Boiler Head Loss - SL 10-85 G3, SL14-115 G3
Flow rate (gpm) 2 4 6 8 10 12 14
Head @ flow (ft wc) 0.5 1.5 2.5 3.0 4.0 4.5 6.0
Boiler Head Loss - SL 20-160 G3
Flow rate (gpm) 4 6 8 10 12 14 16
Head @ flow (ft wc) 0.5 1.0 1.5 2.0 3.0 4.0 5.0
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