So far, the values from the heat pump were much higher than those from the residential unit meters. But they probably had different starting points. Now you have also updated the values of the heat pump below. If you now calculate the differences, then at least it is the same order of magnitude. So first of all, definitely only take the difference values between the reading times, that should be clear. Then you have a total electricity consumption (electricity meter). First, subtract the sums of all the electricity meters from that and allocate accordingly to residential units or common areas. As the administrator, you probably know better than I do how to allocate common areas. So the remaining amount of electricity must be the consumption for heating and hot water. But you only have heat quantity meters. So first convert the share of heat energy for hot water (value from the heat pump) into electricity. Then reduce this amount of electricity for hot water by the share of the common hot water heat quantity to the total hot water heat quantity. This way, you already have the electricity amount for the commonly produced hot water share. Distribute the remaining electricity amount for hot water according to the shares of the hot water m³ figures. The remaining electricity amount should be for heating and can be distributed again according to the shares of the heat quantities on the individual meters. That’s how I would do it. And as I said, you may have to distribute the basic charges of the electricity costs differently.