Tankless Water Heater in Crawl Space?
A couple of thoughts:
1) Some manufacturers recommend/require a backdraft damper if you are installing in a freezing climate, this is especially important if there is only a short run to the exterior.
2) There's a lot of electronics and other assorted moisture sensitive componets in these heaters, if this crawlspace is "damp", I'd be leery of installing a tankless unit down there, in my Chicago climate I frequently see corroded equipment in crawl spaces, and it's often equipment such as conventional tank type water heaters much less sensitive than tankless units.
3) I've put together a webpage on my experience with tankless units (I like them, but they are intolerant of incorrect installation), you may find it useful:
Tankless Water Heater Installation FAQ - Paragon Home Inspections Evanston / Chicago / Skokie / Wilmette / Morton Grove / Glenview / Northbrook / Illinois
I’m paid to be suspicious…
Home Inspections, Infrared (Thermal Imaging) Leak Identification and Inspection Services, Roof, Attic, Building, Basement and Foundation Moisture Intrusion and Water Leak Inspections, Troubled Building Consultations - Serving Chicago and Suburbs
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