Buying a condominium with electric underfloor heating

Whether consumption or demand analysis must be stated in the certificate, usually the demand value (calculated) comes first and the consumption value (based on readings) second. One of them is empty. The night electricity value confuses me a bit. Are these actually instantaneous water heaters, for example in the bathroom and kitchen, or is it a night storage boiler with a tank that heats the water at night? What is the building's year of construction?

Landu just sent me the ID, it is a demand certificate with the specified calculated values. Heating demand with night electricity was given as 126 kWh/m² per year, hot water with electricity as 14.6 kWh/m² per year. The building was built in 1991.

Others can probably say more about the insulation of such a building. However, I find a calculated final energy demand of 141 and an overall energy efficiency of 365 already quite high, but I will leave the interpretation to others now.

The point is, these values mean nothing to you because you have a completely different structure of heat generators. You actually need consumption data from the previous occupant, how much wood they used and how much electricity the instantaneous water heaters and underfloor heating consumed. Only, they themselves will not be able to say that precisely, so you don’t know what costs you will face.

I already thought so. Would it help if I looked at the electricity bill etc., especially from the winter months? You probably get more information from that, right?

I already thought so. Would it help if I look at the electricity bill, etc.? Especially from the winter months? You probably get more information from that, right?

Possibly, but the data sets will be very limited unless he kept a log. In our condominium before, we also had instantaneous water heaters, but underfloor heating with central gas heating. By reading electricity and water monthly, I was eventually able to estimate the electricity costs of the instantaneous water heaters. In your case, however, the underfloor heating is still involved, which distorts it again. I would do it the other way around. Ask for the annual electricity consumption and which particularly intensive continuous consumers he had. Then you can roughly estimate how high the costs for hot water and underfloor heating might be. But that's all very rough and speculative.