I am pulling out an existing wood burning boiler, EKO Biomass 40, and replacing it with a Switzer boiler. This boiler will be my primary and I have a secondary oil-burner in my basement. The heating system is run with a Tekmar 401.

When I did the original install, I ran thermostat wire from the Tekmar to the 3rd and 4th terminals on the EKO (in left part of picture). What purpose do they serve? I need to figure out where to attach them on the new boiler.


EKO Thank you for your help.


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