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<blockquote data-quote="stalker" data-source="post: 129657" data-attributes="member: 863">I was pondering this and a few questions and a couple of comments came to my mind.Comments:Gas water heaters are cheap.&nbsp; I replaced the one in my house for about $700.&nbsp; Mine is a power vent version and I got it on sale at Fleet Farm.&nbsp; I don't remember the brand.&nbsp; They are cheap, but only last about 10 years.&nbsp; I think you can get condensing style gas water heaters also, but I would guess they are going to cost more and be more trouble down the road.I looked at replacing my water heater with a tankless - which would be similar to a boiler - but it didn't justify the extra cost.&nbsp; Tankless units are going to be double and my hot water costs about $5 a month with natural gas.Questions:Would you need to reconfigure the water heater to be used in a floor heat system.&nbsp; Pumps work best with some head pressure on them.&nbsp; So, would you change the drain valve to be the outlet of the water heater?&nbsp; If you plumb it the way they are designed, you would be pumping off the top and that's where any air would get trapped.</blockquote>

[QUOTE="stalker, post: 129657, member: 863"] I was pondering this and a few questions and a couple of comments came to my mind. Comments: Gas water heaters are cheap. I replaced the one in my house for about $700. Mine is a power vent version and I got it on sale at Fleet Farm. I don't remember the brand. They are cheap, but only last about 10 years. I think you can get condensing style gas water heaters also, but I would guess they are going to cost more and be more trouble down the road. I looked at replacing my water heater with a tankless - which would be similar to a boiler - but it didn't justify the extra cost. Tankless units are going to be double and my hot water costs about $5 a month with natural gas. Questions: Would you need to reconfigure the water heater to be used in a floor heat system. Pumps work best with some head pressure on them. So, would you change the drain valve to be the outlet of the water heater? If you plumb it the way they are designed, you would be pumping off the top and that's where any air would get trapped. [/QUOTE]

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