‘useful water temperature’ (Tm) means the water temperature, expressed in degrees Celsius, at which hot water starts contributing to the reference energy, as specified in Annex VII, Table 3;
„kasulik veetemperatuur” (Tm) VII lisa tabelis 3 esitatud veetemperatuur [°C], millest alates kuuma vee soojus hakkab lisanduma võrdlusenergiale;