30000€ for an air-water heat pump?

With a COP of 3, you have an electricity demand of 10,000kWh.

And I would put a big question mark next to the COP=3 with 60% radiators. It can also be significantly lower, and then it gets even more expensive.

Unfortunately, I have not had any proper consultation yet, and I will not implement anything before that.
So far, I have only informed myself via Google.

On the internet, I have only found the following.
How much electricity does a 12 kW heat pump need?

For example, if you assume a heat pump with 12 kilowatts (kW) output, the expected annual electricity consumption for a living area of around 100 square meters (sqm) is likely to be between 6,000 and 6,500 kWh.

And for heat pumps there are special tariffs that are significantly below 30 cents.

For example, if you assume a heat pump with 12 kilowatts (kW) output, the expected annual electricity consumption for a living area of around 100 square meters (sqm) would be between 6,000 and 6,500 kWh.

The problem is approached differently. You take the heating demand of the house and calculate from there. With a modern underfloor heating system and low flow temperature, you can expect to get over 3 kWh of heat from 1 kWh of electricity. With radiators at 60 degrees flow temperature, the ratio is rather about 1:2.

And for heat pumps, there are special tariffs that are well below 30 cents.

These will disappear or become correspondingly more expensive in the medium term. Normal household electricity for new customers is around ~45c/kWh. It is unrealistic to believe that you can get heat pump electricity for under 30c. Tendentially, I would expect even more.

So, let's summarize briefly:
- you cannot afford oil for 4000€/year
- you want to install a 30k heat pump in an older house with 60% radiators
- at 60° flow temperature, a heat pump will not be able to operate efficiently
- accordingly, it is absolutely not guaranteed that you will pay less for the heat pump than for oil

I would not change anything at first but rather see which measures you can use to reduce the heating demand and if there is possibly a way to get rid of the radiators.

Sorry but I can't afford that!

But 240 sqm? :rolleyes: Inherited, bought, or built the building? Year of construction and what energy standard (insulation, windows, façade…? —> topic heating load You have to get down from 60 degrees flow temperature, otherwise after conversion you might not only pay more in running costs, but still have the 30k€ initial costs hanging over you. Because of the oil burner, I guess built between 70...85…max 90.

I need about 3000l per year, which amounts to €4350 per year at €1.45, so €362 per month.

Is the "hut" at least warm then? Are all rooms heated? Is night setback active? You have to, I repeat, do something about the building envelope.

The house is from 1982 and was extended and insulated in 1999. I have a company coming tomorrow, let's see what they say.