Here is the reply from the previous post. The answer seems quite reasonable.
Quote:
It is pretty much impossible for us to answer your question conclusively, simply because we have not done the product testing necessary to determine the answer; all of our product testing is conducted to determine how our product performs in an automotive cooling system.
Having said that, the scenario you describe is not all that dissimlar from what takes place in an automotive cooling system, where the cooling passages in the cylinder head are directly adjacent to combustion chambers that see temperatures in the neighborhood of 600°F. The only recommendation I can make is to monitor the system as best you can, try to inspect the fluid every couple of months to see if any sediment or corrosion is evident in the fluid. If the boiler is turning on and off around the clock, you may wish to change the fluid every 3 years instead of 5, since that service life is based on a car that is only driven for a couple of hours a day rather than constantly.
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