We are converting from oil to gas, so since the gas line needs to be brought it, hopefully the extra BTUs the tankless uses isn't an issue. Another thing to consider is we don't want to have to run an vent for the exhaust all the way to the roof. Even re-using the old chimeny as a chase, it would need a new flue, which would right away make kill any savings the cheap model may yield. Plus, we'll try to be a bit green with this one.
High efficiency tank units seem to go for around $800, and that we can vent directly outside the wall, but the tradeoff is a loss of even more space in my tiny utility room. I'm hoping to opt for a tankless unit for no more than $1200 that I can vent directly outside, and then have a decent size laundry/utility room.
PLUS, going high efficiency you get a 30% tax credit, and there are other incentives floating around out there.
http://www.energystar.gov/index.cfm?c=tax_credits.tx_index
Oh and these look a lot better too.
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