steel vs. cast iron oil boiler opinions? - HVAC-Talk: Heating ...Jan 21, 2010 · We have an energy efficient (by 1987 standards) 2,000 sq ft contemporary in NH with 2 zone baseboard hot water heat and tankless hot water coil. Our Burnham V-714T cast iron oil fired boiler is on its last legs (internal leaks), and our trusted oil supplier/HVAC installer has recommended either a steel New Yorker boiler or a more efficient cast ...