‘electric back-up heater capacity’ (elbu(Tj)) is the heating capacity [kW] of a real or assumed electric back-up heater with COP of 1 that supplements the declared capacity for heating (Pdh(Tj)) in order to meet the part load for heating (Ph(Tj)) in case Pdh(Tj) is less than Ph(Tj), for the outdoor temperature (Tj);
potencia de calefacción [kW] de un calefactor eléctrico de reserva real o hipotético con un COP de 1 que complemente la potencia de calefacción declarada (Pdh(Tj)) a fin de alcanzar la carga parcial de calefacción (Ph(Tj)) en caso de que Pdh(Tj) sea inferior a Ph(Tj), para una temperatura exterior (Tj). 32.