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])
Hardness is to be 7 grains per gallon or less / 120 ppm or less
Important: Ensure that these limits are acceptable for the other water-side components in the
system.
Boiler Head Loss - EX 700, 850
Flow rate (gpm) 20 30 40 50 60 70 80 90 100
Head @ flow (ft) 2.6 2.9 3.2 3.7 4.2 4.8 5.5 6.4 7.2
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