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- 31 Dec 2003
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My old mother-in-law's old indirect oil fired boiler is set at 75c and the cylinder stat is set at 55c but the DHW is nearly very, nearly dangerously, hot. I assume that suggest the cylinder thermostat is shot? Reluctant to set the cylinder stat below 50c because of risks of Legionnaire's Disease although at present it's actually much hotter than it's currently set.