A 10° differential is good. LL at 180° and HL at 200° is fine. On a Honeywell aquastat, always keep at least 20° between the LL and HL to prevent circulator lockout. On Hydrolevels you can set them 10° apart, but I'd just stick with 20° apart for safety.
You could lower your LL to save a little coal during normal weather and raise up to 180° during those polar vortex events.
Looking for help with efm 520 timer not turning on boiler.
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- New Member
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- Joined: Sat. Sep. 23, 2023 4:36 pm
- Stoker Coal Boiler: Efm 520
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Thank you again for all your help I really appreciate it, take care.
- davidmcbeth3
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100% surer my advice was totally worthless on this one.