Assessment of heating electricity consumption in existing house

If neither the roof nor the top floor ceiling of the house is insulated, the values are no surprise. Just slapping a heat pump into an old shack is not a good idea. Have the windows ever been replaced? As correctly says, insulating the ceiling pays off in a very short time and can be done easily, quickly, and cheaply by yourself given the circumstances.

Oh, according to the energy (consumption) certificate class B with a final energy consumption of 51 kWh/(sqm*a), if that means anything.

Oh, according to the energy (consumption) certificate class B with a final energy consumption of 51 kWh/(sqm*a) if that means anything.

Just ask for the bill! So the consumption there!

Just ask for the bill! So the consumption there!

He doesn't need it, the energy certificate is obviously a consumption certificate. 51kWh/m²a *196m² *0.30€/kWh = 3000€ or about 10000kWh/a.

If the seller only knows his invoice, then the heat pump will probably not be operated efficiently. Often, there is still a lot to be gained, but for that you have to deal intensively with the technology and, if necessary, enlarge the heating surfaces in some rooms, limit circulation in time, remove buffer storage tanks and thermostats, ... all to lower the flow temperature. If the heat pump is the sole problem (unlikely), a replacement may eventually be worthwhile in terms of costs.

The assumed 10000kWh of electricity should correspond to about 15000-35000kWh of heat for heating and domestic hot water, depending on how well or poorly the system runs. Only when you know the amount of heat can you assess how well the system is running. That means after moving in, be sure to install a heat meter and monitor during the winter before taking rushed measures.

In the new building, we have a fraction of the costs; even in old buildings, much can be improved, but that costs time and money.

Is there still a gas connection? The consumption of oil or gas before the heat pump was installed would be interesting.

He doesn’t need it, the energy certificate is obviously a consumption certificate.
51kWh/m²a *196m² *0.30€/kWh = 3000€ or about 10000kWh/a.

Well, that roughly matches his statements.

If the seller only knows his bill, then the heat pump is probably not operated efficiently. Often quite a bit can still be improved, but you then have to deal intensively with the technology and possibly enlarge heating surfaces in some rooms, limit circulation time, remove buffer tanks and thermostats, ... all to lower the flow temperature. If the heat pump is the sole problem (unlikely), a replacement might eventually be worthwhile in terms of costs.

The assumed 10000kWh electricity should mean about 15000-35000kWh heat for heating and hot water, depending on how well or poorly the system runs. Only if you know the amount of heat can you assess how well the system is running. That means after moving in, definitely install a heat meter and observe over the winter before taking any rushed measures.

We have a fraction of the costs in a new building; even in old buildings much can be improved, but it costs time and money.

Is there still a gas connection? It would be interesting to know the consumption of oil or gas before the heat pump was installed.

The heat pump was installed in 2011, before that there was an oil heating system.
I don’t want to sugarcoat anything, but I can well imagine that quite a bit can still be optimized through the settings. The sellers are older people who probably never begrudged anything but have no clue about technical things. The controllers for the underfloor heating are even hidden behind shelves because they never adjusted anything there.