Oil boiler high/low temp

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jmoser201

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Recently moved into a home that has an oil boiler which provides hot water for baseboard heating and an indirect hot water tank. I just had a plumber/hvac guy out to replace the expansion tank and he noticed the Honeywell high/low setting which is currently set at 180/160 with a diff of 10. He said the low was set too high and put it at 120. I researched and that seems way too low for an oil boiler, but I’m not an expert. Does anyone know what the best settings would be for my system? It’s a peerless boiler from 1989. My concern is that 120 will cause condensation

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Fitter30

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Leave it at the 180/ 160. Might want a outdoor reset control ( varies the water temp by outdoor temp). Minimum return water temp 135* for your boiler
 

John Gayewski

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That type of boiler should only be set with a 140 min. Anything lower will hasten the boilers life dramatically.
 

Sylvan

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might need it, but I guess it’s been set up without one since 1989. So I should leave it at 160/180?

Just because it is WRONG doesn't men it should be left like that BUT do what you want .. As long as you were told then you took full responsibility
 

Sylvan

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Appreciate the feedback! Not sure what the hvac guy I had out was thinking with setting it at 120.



The "Guy" was possibly thinking about scald protection for a shower


People read various codes and have no idea what it means as it very ambiguous to the non professional
 

Fitter30

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T
The "Guy" was possibly thinking about scald protection for a shower


People read various codes and have no idea what it means as it very ambiguous to the non professional
Their is a taco control and sensor on the dhw tank and wiring back over to boiler.
 
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