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4) Systems containing oxygen – Many hydronic systems contain enough dissolved oxygen to cause
severe corrosion damage to a cast iron boiler such as the ODV. Some examples include:
• Radiant systems that employ tubing without an oxygen barrier.
• Systems with routine additions of fresh water
• Systems which are open to the atmosphere
If the boiler is to be used in such a system, it must be separated from the oxygenated water being
heated with a heat exchanger as shown in Figure 20. Consult the heat exchanger manufacturer
for proper heat exchanger sizing as well as ow and temperature requirements. All components
on the oxygenated side of the heat exchanger, such as the pump and expansion tank, must be
designed for use in oxygenated water.