Residential and commercial water heaters; hot water tanks; water heater systems comprising tanks, thermostats, heating elements, and manual and automated controls sold as a unit; commercial and residential furnace boilers; indirect fired water heaters powered by solar energy; indirect fired water heaters powered by solar energy with an electric or bivalent backup; water heaters powered by solar energy; gas-fired water heaters; and modulating condensing water heaters and boilers for domestic, commercial and industrial use

'autom':20 'backup':52 'bival':51 'boiler':30,70 'commerci':3,26,73 'compris':12 'condens':66 'control':21 'domest':72 'electr':49 'element':16 'energi':38,46,58 'fire':32,40,61 'furnac':29 'gas':60 'gas-fir':59 'heat':15 'heater':5,10,34,42,54,63,68 'hot':6 'indirect':31,39 'industri':75 'manual':18 'modul':65 'power':35,43,55 'residenti':1,28 'solar':37,45,57 'sold':22 'system':11 'tank':8,13 'thermostat':14 'unit':25 'use':76 'water':4,7,9,33,41,53,62,67

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