I use a oil fired boiler for baseboard heat and hot water. I have a weil mclain that is about 83-84% efficient when tested annually. If I were to replace it, would I be able to find a 90+% eff. oil fired model? I know that natural gas furnaces and boilers are offered in high eff, but I haven't yet seen an oil fired boiler that is high eff. Thanks in advance.