In replacing an old system in a condo (ca. 1200 sqft), gas boiler with baseboard, we are comparing some mod. con. systems (with indirect HW) and EK's system 2000. A neighbor had a bad experience with a condensing boiler a few years ago.
Our units have no side wall to vent from (you can't vent into your neighbor's basement, right?). It has to vent out the back (condo rules), right under important windows for our view (a major value here). Our neighbor's vent plume drove them to distraction, to the point that they ripped out the condensing & put in a mid-efficiency unit that vented out the flue.
None of the contractors who talked about side-venting mentioned the plume as a potential problem, although when asked about it, they say it's there. A couple of manufacturers, when asked, replied that there is a plume.
How much of a plume would there be? We're in CT, outside New Haven. I imagine it would be more than a dryer, and much more frequent.
Is this a problem that contractors should take note of & draw attention to? I'm surprised we had to chance on a neighbor's experience.
Thanks for your help.