ᐅ €30,000 for an air-to-water heat pump?

SoL schrieb:

With a COP of 3, you are looking at an electricity demand of 10,000 kWh.

And I would put a big question mark on the COP=3 for 60% radiators. It can also be significantly lower, which would make it even more expensive.

Unfortunately, I have not received any proper advice yet, so I will not proceed with anything before that.
So far, I have only researched via Google.

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

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

There are special electricity tariffs for heat pumps, which are significantly below 30 cents.

Arguss123 schrieb:

If you consider a heat pump with a 12 kilowatt (kW) output, the expected annual electricity consumption for a living area of about 100 square meters (sqm) would likely be between 6,000 and 6,500 kWh.

This issue is approached differently. You start with the heating demand of the house and calculate from there. With a modern underfloor heating system and low supply temperatures, you can expect to get over 3 kWh of heat from 1 kWh of electricity. With radiators operating at a 60-degree Celsius (140°F) supply temperature, the ratio is closer to 1:2.

Arguss123 schrieb:

There are special rates for heat pumps that are significantly below 30 cents.

These rates will likely disappear or become more expensive in the medium term. Standard household electricity prices for new customers are around 45 cents per kWh. It is unrealistic to assume you can get heating electricity for less than 30 cents. In fact, I would expect prices to increase even further.

So, let’s summarize:
- You cannot afford heating oil at 4,000 euros per year.
- You want to install a heat pump for 30,000 euros in an older house with 60% radiator heating.
- A heat pump cannot operate efficiently at a supply temperature of 60 degrees Celsius (140°F).
- Therefore, it is not guaranteed at all that using a heat pump will cost less than heating oil.

I would recommend not making any changes yet but first looking into measures to reduce the heating demand and whether there might be a way to replace the radiators.

Arguss123 schrieb:

Sorry, but I can't afford that!

But 240 square meters (2,583 square feet)? 🙄
Was the building inherited, purchased, or newly built?
Year of construction and what energy standard does it have (insulation, windows, facade…? —> heating load topic

You need to get down from 60 degrees Celsius (140°F) supply temperature, otherwise, after conversion, you might not only pay higher operating costs but also have the €30,000 initial costs hanging over you.

Based on the oil heating, I’d guess it was built between 1970 and 1985… maximum 1990.

Arguss123 schrieb:

I need about 3000 liters per year, which at €1.45 per liter amounts to €4350 annually, or €362 per month.

Is the “cabin” at least warm then? Are all rooms heated?
Is the night setback activated?

You definitely need to do something with the building envelope, I repeat.

The house was built in 1982 and was extended and insulated in 1999. I have a company coming tomorrow to take a look, so we'll see what they say.