I'm in the beginning stage of trying to figure out the best way to convert to gas. We have a 12 yo. Weil-Mclain Gold series oil fired boiler with on demand HW. The house 1600 sq. feet with one bath, three kids and two adults. At this point our family is very tight in the funds dept. What would be our best option, convert what we have or buy new. Our first and only estimate was $6400 for a Navien unit and $7600 for a Rinnai unit....both kind of out of our price range. Any other good options out there? Thanks Guys!