Shower heat exchanger NELA | SAKAL
Thus, about 90% of the energy used for water heating is uselessly wasted in the drain (assuming the temperature of the incoming tap water is about 10 oC). A special shower water heat exchanger included in the drainage system can significantly lower these high energy losses, almost up to the level of approximately 50%.
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Shower heat exchanger NELA | SAKAL's website is sakal-ovt.cz