COMBI-TECH R1K series are for the heating only units made by RADIANT. The condensing exchanger, 100% made by RADIANT, delivers unique performances and effi ciencies. The larger inner diameter of 28 mm. leads to an improved maintenance and prevents remarkably the clogging. Thanks to prestigious components, we have achieved a stunning 1:9 modulation, thus the perfect solution for highly effi cient under floor heating plants, to avoid continuous ignitions and shutdowns, which reduce remarkably the consumptions. High capacity 8 l. expansion tank, side housed for an improved effi ciency and easier inspection. We have improved the overall ergonomics of the unit, for a better accessibility and easier maintenance. The units feature the new controls, a breakthrough aesthetics, white back-lit and a new bottom cover aimed to hide the fittings. The units are made for a perfect replacement and to emphasize the aesthetics, thus to make it easier the installation into the various rooms.