Heating water consumes a lot of energy, yet this heat goes down the drain... EHTech has developed and patented a way to recover 71% of this heat: Obox®. EHTech is able to recover energy from waste water from individual dwellings, apartment buildings, hotels, sports halls and swimming pools. For collective applications, the connected Obox® C heat recovery unit is available for purchase+service or as a service. EHTech has been designing and manufacturing waste water heat recovery systems since 2009, has filed 7 patents and won 8 international awards since 2016.