Lambda controlled boilers

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Pex buried? Can you elaborate? What kind exactly?

??? Insulated pex lines inside the black corrugated pipe...what everyone uses to move hot water from boilers to air handlers/heat exchangers in another building...
 
Corrugated? No, that isn't what everyone uses.

If you dont have Thermopex or similar, that uses closed cell foam inside a solid casing (not corrugated), you most likely have a wrapped pex product that is losing serious heat to the ground.