Because rendeMIX turns the return flow from the radiators into the flow for the underfloor heating, the water flows back to the condensing boiler much colder. The colder return water produces more condensate and more heat from the flue gas reaches the heating water, so that less gas or oil is required thanks to rendeMIX return use. Of course, rendeMIX can also be combined with other heating applications that operate with different system temperatures (e.g. air heaters/radiators, radiant ceiling panels/radiators, hot water storage tanks/floor heating, etc.). The return flow of the first heating circuit does not necessarily have to be hotter than the flow of the mixing circuit for the return flow utilization to work. In the magnifying glass you can see how hot return water from radiators is used for the flow for the floor circuits. If required, rendeMIX can add hot or cold water to achieve the desired temperature. Operating the radiators or the floor circuit alone is also part of the rendeMIX range of functions.

The video shows our rMix 2×4, which is used as a mixing manifold (with integrated return utilization) to combine an unmixed heating circuit (H) with a mixed heating circuit (M) (also available as rMix 2×4+ for two mixed heating circuits). The mixer primarily uses return water from the first unmixed heating circuit (H) as the flow for the second mixed heating circuit (M). This results in efficient return flow utilization. If the temperature is too low, a certain amount of hot water from the boiler flow is added. If it is too high, cold water from the return of the mixing circuit is added. If the flow rates of the two circuits are unequal, the pressure can be equalized via the integrated bypass, as with a hydraulic separator, so that the system is hydraulically decoupled. The smaller the temperature spread between the heating circuit return and the mixing circuit flow, the less the mixer has to add in order to achieve the corresponding temperature. In this way, the entire amount of heat in circulation is utilized before it is fed to the boiler as return flow and the return temperature to the condensing boiler is significantly reduced. This results in maximum condensing benefit (radiators, radiant ceiling panels/radiators, hot water cylinder/floor heating, etc.). The return flow of the first heating circuit does not necessarily have to be hotter than the flow of the mixing circuit for the return flow utilization to work. In the magnifying glass you can see how hot return water from radiators is used for the flow for the floor circuits. If required, rendeMIX can add hot or cold water to achieve the desired temperature. Operating the radiators or the floor circuit alone is also part of the rendeMIX range of functions.