Nobody ever complains loudly, that their CWI works brilliantly, people only complain when it goes wrong. I had it installed in the mid 90's, it works, and no problems. It certainly helps keep the expensive warmth, where it belongs, in the house, and the cold out - things is, you need to do your part, in not generating excess moisture in inside the home.
Mine is fine. I live in a coastal area subject to winter storms and driving rain, exposed on the West. I get no damp. The heating costs dropped noticeably, and my old (15kW boiler) was no longer incapable of keeping the house warm on frosty nights. (Calculated whole-house heat loss at 20C difference dropped to 12kW)
Mine is a modern house with good quality brickwork.
-Get yourself a towel rail that hangs off the front of the radiator
-Put the towel on it NOT over the radiator
-If you can, leave the radiator on for a bit when the towel goes on
-Open the window for half an hour each morning
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