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I have a wgo-4 tankless coil--not in use--gas hwh,3zones , becke

I have a wtgo-4 , coil-not in use--gas hwh,3zones,beckett clean cut, main zone large radiators, other zones baseboard--1600 sqft house.
I went to a smaller nozzle--1.10 80b to save oil--looks like Im using more ---should I go back to the 1.25 80b
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