We currently have an oil fired boiler supplying HW baseboard heat and domestic hot water. Found out today during a yearly tune-up that the combustion chamber is shot, the tech had me look inside and there is a big hole in the back . the unit is a Crown 129,000BTU probably 30 years old. We also have an AC system probably on it's last legs, condensor housing rusting, needs freon every year. Since my wife thinks even a new oil system would still be "dirty", what are some thoughts regarding conversion to gas and keeping the baseboard system? How about a small gas boiler for heat and a tankless HW heater? Too complicated, costly? We live in Norfolk, VA maybe 1800 SF ranch.