Hi Mark,
change the t-stat if it's the wrong one (windsor style), otherwise leave it alone. The setting of the t-stat is not that critical. Anywhere between 180 and 205 degrees F is OK. A lower t-stat rating will not prevent overheatng, it just tries to regulate the temp of the coolant at a different temp. Overheating is the result of insufficient btu removal, or excessive btu input, neither of which is affected by the t-stat setting.
My advice would be to select the t-stat setting based upon the settings of the temp switches controlling your fans.
keep the fires lit & stay warm my friend
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