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I can’t speak to combo washer/dryers, but heat pump dryers have been around for several years. We got an LG one a few years ago because our old one vented into the garage and there was no practical way to extend the vent outside.
We’re very happy with it. It does take slightly longer to dry clothes, and the capacity is slightly smaller than our old electric one, but they’re also gentler on clothes. We haven’t had a single issue with it yet over the years.
Yep, that’s exactly what it does, and it’s great. Ours technically supports drain line, a removable water tank, and conventional venting, but the drain line is so convenient I’m going to use it going forward in my next place even if there is a vent. So much less hassle to set up and maintain without lint building up.