In general, the electricity tariff D1 is applicable to private users who use the heat pump as a generator for the exclusive space heating.
Therefore, it is not applicable to condominiums with central heating system.
Also excluded are combined or hybrid systems (heat pump + boiler), unless the second generator is not used only in case of emergency.
In these cases, you must submit a statement by a qualified technician.
It is then possible application is installed, the only heat pump for domestic hot water production (instead you can by matching machines).
The rate is D1 applicable in all systems with heat pump, Even in the presence of photovoltaic systems. We recommend in these cases to assess carefully the costs and benefits.
In general, the new tariff is convenient for cases of high electricity demand, however, is partially covered by the PV system. To understand whether the D1 is beneficial or not must, therefore, consider the amount of energy which is not covered by the production of photovoltaics.