Is the surcharge for an air-to-water heat pump justified compared to gas?

What is the deal with the cooling function? Do you need or want it? If not, can it be left out?

This is another expansion valve in the system. It is part of the standard equipment in many heat pumps. Removing it is not really possible if it is included. But if it is absent and the client "wants it," they sometimes demand four-figure amounts for it.

What about the cooling function? Do you need or want it? If not, can it be deducted?

It is of secondary importance to us, it can probably cool in summer, but allegedly only about 2 degrees above room temperature after the initial reading. We leave it out of the decision. I don't believe the general contractor doesn't want the heat pump, because he simply included it in the first draft of the contract for us and the sales department also promotes it properly... I rather think that the seller's market is becoming apparent here and they are speculating that the first offer will be blindly signed :rolleyes:

The seller's market exists independently of the heating system. Why is the surcharge for the heat pump so high - in the sense of too high? What is included in the heat pump variant? What can be omitted (e.g., [ERR], buffer, cooling function)? You should question that.

Hello,
the additional cost is really quite high. Or is it perhaps that the gas boiler is still calculated with regular radiators and the heat pump includes an "upgrade" to underfloor heating?

But your calculation is basically quite correct. If you calculate soberly, the heat pump is still at a disadvantage at the moment. How this will develop in the long term, nobody can say.
We therefore also decided on gas. But definitely design the underfloor heating so that you can install a heat pump later. In other words, the pipe spacing must be small enough to allow for low flow temperatures. The gas heating won't last forever; in about 20 years you'll have to replace it and then, with high probability, you won't be allowed to install a gas heating system anymore.

Regarding the 20 kW peak power. You don't need that for heating, but for hot water production. And with 4 kids, you'll need that! With the heat pump, the 300-liter hot water tank would be borderline. If someday 6 people want to shower in the morning, the last person will only get cold water.
The gas heating can practically reheat the water on demand with 20 kW.

Best regards,

Andreas

Thanks to everyone who gave so many food for thought so quickly!

The underfloor heating exists anyway and is always designed so that low flow temperatures are possible.
I therefore clearly tend towards gas and try to limit further special requests with thoughts of the previous prices for the air-water heat pump or even the plaster with light reflectance value < 30 very few.

The prices really shake me... But Happy Wife, Happy Life, so probably some things will come after all... :p

We have now completed the first full year with the air-to-water heat pump and are very pleased with our low costs for hot water / heating / ventilation (combined unit). At the time of our comparison of options, we had included our assumptions about price developments. We assumed back then that gas (generally fossil fuels) would increase significantly in price and that CO2 would be taxed even more heavily. We also assumed that in the long term we would continue to have access to affordable electricity or possibly equip our building further with photovoltaics and battery storage. Of course, these are only assumptions; none of us have a crystal ball. But we both considered it unlikely that the price ratio between electricity and gas would remain the same in the long term. We strongly believe that gas will become more expensive.