Tankless Water Heater

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Old 05-05-01, 10:07 AM
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I recently purchased a tankless water heater to replace my aging, 30 gallon tank heater. Upon closer examination of the installtion instructions, it became clear that I needed a larger flue to accommodate the 117,000 btu output (yes that's correct). The current flue is 3.5", it will have to be a 6" diameter flue to be acceptable. I live in Boulder which is at 5,300 feet altitude which makes the need for this larger flue even more imperative. I have looked at relocating the existing loction as well as several other options that won't work. This means that I am stuck with a substantial construction project since the unit is on the lower of three levels and includes work to the exerior roof.
My question: has anyone had this situation or performed this type of construction to increase the exhaust flue? Are there options I haven't considered? If so, was it a major pain?

Thanks so much,

Al
Boulder, Colorado
 
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  #2  
Old 05-05-01, 01:43 PM
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Location: Lake Murray, SC USA
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I would check to see, if you use a power exhaust, can you run it through the existing 3.5" flue.
 
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