Drain water heat exchanger, contraflow heat exchanger; domestic, industrial and commercial water heaters; heat reclaimers, energy saving device, namely heat exchangers; Drain water heat recovery systems comprised of one or more heat exchangers to extract heat from waste water for useful purposes

'commerci':11 'compris':27 'contraflow':5 'devic':18 'domest':8 'drain':1,22 'energi':16 'exchang':4,7,21,33 'extract':35 'heat':3,6,14,20,24,32,36 'heater':13 'industri':9 'name':19 'one':29 'purpos':42 'reclaim':15 'recoveri':25 'save':17 'system':26 'use':41 'wast':38 'water':2,12,23,39

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