How to get a traditional hot water radiation system off oil

I have a 3 story 1890’s building in St. John’s, Newfoundland that is in a state of incomplete renovation.  (UFFI insulation in exterior walls replaced with Roxul; knob and tube… I have a 3 story 1890’s building in St. John’s, Newfoundland that is in a state of incomplete renovation.  (UFFI insulation in exterior walls replaced with Roxul; knob and tube…Read MoreGreenBuildingAdvisor