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Out of curiosity, how often do you need to send it back for service, especially the descaling of the HX mechanism?
I haven't sent it back. You can totally descale it yourself--I do. It is a little more complicated to descale a HX than double boiler system, but not much. One extra step really to run descaling solution through the HX. And rinse it, of course. Also, most of the scale buildup is in the boiler not within the HX.
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