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Message: <blockquote data-quote="BillM" data-source="post: 4291582" data-attributes="member: 45785"><p>Depends on the unit you get.  First one was around 178,000btu, new one is less than half that, IIRC. It only costs about $350, vs. $500 for the old one, which did a 40 degree rise on 6.6gpm. This cheaper unit does 38 degrees on 4gpm. I did have to run 3/4" iron pipe for it. A T and about 3' of larger pipe. The ones Home Depot sell run upwards of $1100. My gas bill with 5 adults runs around $69 a month in the summer. That's with bill averaging. It was closer to $90 in the winter.</p></blockquote><p></p>