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Hey, if she's not real worried about space efficiency (IE, having a bunch of panels over 1 or 2 commercial), then what shes got works just fine. The commercials have some downsides to being overly efficient - they can heat steam to the point of melting pipes if not properly set...

Is your mother's setup DIY, or something commercial? I know the commercial units are VERY efficient, as they're vacuum purged, so there's basically no heat loss. Something like the OP is building could be interesting (and could work quite well), but isn't going to have nearly the gain that a...