Costs for heat pump and photovoltaic in 2024 in small old buildings

Pana combi indoor module + outdoor unit 5kW costs 6,500€

The most important thing in the conversion: leave out everything that can be left out (buffer storage for example, and definitely no combi buffer), no individual room control or at least 80% of the heating circuits/radiators always on, hydraulic balancing method B = room-specific heating load and adjustment of flow rates, possibly enlarge radiators (the only important thing is the highest required temperature in the circuit – that must go down), no mixers (mixer = water too warm and can be cooler) and correctly size the heat pump – in your case without calculation: at most the smallest heat pump, so 5 kW. This can be done either by a competent specialist company (very rare), a good EEE (sometimes) or an experienced planning company (fully booked and expensive): always critically question the result until you understand it yourself.

No, I don't get anything from Panasonic. I have now seen them in operation with data on site at two acquaintances (generation H and J) and my own generation J (because propane is not possible at the installation site) is coming this summer, for my mother-in-law the L next year.

Where do you get such bad prices? The device including delivery (without piping etc.) is under €5,000

Indoor unit as a combined hydro module with 185l hot water storage tank is about €1k more expensive than without.

So - as of today, you can or have to expect from €20k upwards. Before subsidies! I just read an offer: replacing an old gas heating system with a Panasonic heat pump. All-in offer from the craftsman was €19,900 to be precise. Especially Asians like Panasonic have been offered much more for some time now - Richter & Frenzel seems to be well established as a wholesaler and supports many craftsmen who want to move away from the far too overpriced (German) devices.

P.S. The Asians currently have delivery times of 2-5 working days. New models directly with propane as refrigerant.

That is nonsense. Way too much lead time. Many companies only have weeks as lead time, but no longer years. Heat pump manufacturers are partly on short-time work because the first hype is already over again thanks to the far too high margins of the companies. On the other hand, production capacities are being built endlessly. Either look for mid '27 so that you are prepared for winter or then in winter '27/'28 so that the new heating system can come after the heating season.

I know you have a small old building. But I did not expect such small floors.

Heat pumps become cheaper when the subsidy is removed.
There simply aren't enough customers for 50,000€. The internet price is a guideline, the triple price is not justified (but the Q7 has to be paid monthly, grin)

Skilled at handiwork?
But I believe that was not the case with you, if I remember correctly.
Technically and in terms of price/performance, I can recommend the Panasonic Aquarea "Geisha." In the new generation "L" as a hydrosplit with propane (R290) as refrigerant and now also in discreet black design and quieter:
Outdoor unit with refrigeration circuit and heat exchanger – only supply/return water goes in there, and of course electricity;
Indoor unit with 3-way valve for domestic hot water preparation and all other parts as well as the new hot water tank directly underneath in the device is truly plug and play and no German manufacturer can compete price-wise, and from an installation perspective it's very well-solved.
By the way, Panasonic builds most of the heat pumps or compressors for them worldwide, and the series is absolutely mature and excellent regarding the specifications on paper AND in reality.

No, I get nothing from Panasonic. I have now seen it in operation with data on-site with two acquaintances (generation H and J), and my own generation J (because propane is not allowed at the installation site) is coming this summer, and for my mother-in-law, the L next year.

Price, if no radiators are replaced:
Material with everything (Pana combo indoor module + outdoor unit 5kW is 6.5k€) 8k€ gross.
You do the base and gravel bed yourself, and
for installation realistically 2 people, maximum 2 days, so 2*2*8*100€ = 3.2k, (in your case, without radiator replacement)
plus one day for the electrician: 1k€,
Planning and construction supervision including commissioning and explanation by EEE (or another competent person), 3 days = 3k€.
In total about 15k€.
But for the boss’s Benz/Porsche another 5k€ on top, therefore subsidy goes down.

You get subsidies if done by a specialist company (possibly accompanied by EEE): 30% base, +5% for propane gas, +20% if your gas heater is 20 years or older – so 35-55% or even more if in the two calendar years before the year prior to the application (so 2021/2022) your household had less than 40k taxable income on average (as shown on your tax notice).

The most important thing in the retrofit: Leave out everything that can be left out (buffer tanks e.g., and absolutely no combination buffer), no individual room control or at least 80% of the heating circuits/radiators always on, hydraulic balancing method B = room-by-room heating load and adjustment of flow rates, possibly even enlarge radiators (the only important thing is the highest needed temperature in the circuit – this must come down), no mixers (mixer = water too warm and can be colder), and properly size the heat pump – in your case without calculation: the smallest heat pump at most, i.e., 5 kW.

This can either be a competent specialist company (very rare), a good EEE (sometimes), or a planning company experienced in this (fully booked and expensive): Always question the result critically until you understand it yourself.

Do the 20,000 before the subsidy refer now to both heat pump AND photovoltaic, or only the heat pump?

There are still old radiators in the two children's rooms, which could definitely be replaced, that would be painless.