Answer We do not recommend the use of Uponor MLC pipes within solar installations, since the operating temperatures may damage the Uponor Unipipe MLC pipe. Should the Uponor MLCP system be used in a solar installation anyway, you must ensure that utilisation at the maximum temperature of 95°C does not exceed 100 hours. Basically, a maximum operating pressure of 10 bar at a maximum permanent operating temperature (Tmax) of 70°C should be observed (for other pressure/temperature combinations, please contact us). However, in some circumstances even these stress limits cannot be applied when using solar installations. If the inhabitant of a house equipped with a solar panel is on holiday, there is no usage of warm water. This may lead to a backlog of heat which may damage the Uponor MLC pipe. Should the Uponor MLC system be used in solar installations, it must be guaranteed that the above-mentioned stress limits are not exceeded.
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