Newly built single-family house - gas or air heat pump + photovoltaics + storage?

2021-10-18 12:14:35

First of all, there still needs to be a change in people's minds. The rising energy costs and a CO2 emissions price are painful but probably for that reason also effective measures. Ultimately, our daily behavior holds a huge potential for savings that takes effect immediately. Energy that is not needed in the first place is the most environmentally friendly. For this reason, I am also not very upset about fuel prices, even though I consider myself to be particularly dependent on the car.

2021-10-18 13:41:46

Compared to the internal combustion engine, it could win. ;-)

No, of course hydrogen and methanol are something nice. And we will also need both in huge quantities in the future. The important thing is that the end consumer knows that it will not reach them. It all goes to the industry. And even the industry, due to the exorbitant price, will do everything possible to use as little of it as possible.

A different picture: Many complain about the wind power plants and electric cars and hope for hydrogen or e-fuels. They must be made clear that driving with hydrogen/e-fuels means operating five times more wind power plants than driving with a battery. And no - import does not work, it is much more expensive and not at all realistic in 30 years.

Our dear still "disaster government"... And by disaster I do not mean that it was disastrous. Only acted due to disasters. The shutdown of nuclear power plants was one of the government's big mistakes. It should have been handled differently. First the coal power plants, then the nuclear power plants. What is the use of shutting down nuclear power plants in Germany if at the border to France and soon more in Poland stand? With the high quality standards that apply in Germany, I prefer a few nuclear power plants in Germany rather than in France or even Poland to import electricity from there.

2021-10-18 13:54:51

Thanks! It will be a Vaillant aroTherm Plus. We would position the air-to-water heat pump so that it does not point directly at the neighbor’s house. The direct distance would then be 8m from the air-to-water heat pump to the neighbor’s children’s room and 20m respectively to the other two neighbors, who are in direct line of sight to the air-to-water heat pump, but I hope that is not a problem.

You are admittedly in a very poor negotiating position, but I would still ask the general contractor about the surcharges. A €12K surcharge is quite hefty: the gas boiler, solar thermal system, and the necessary piping for those would be omitted after all; and air-to-water heat pumps are really not that expensive. If it is still possible and an option for you, you can also save the chimney and fireplace. You will save the gas connection anyway. In the arguments for the heat pump, you also mentioned photovoltaics. Are you installing a photovoltaic system?

If you decide on a heat pump and possibly photovoltaics, you are welcome to ask here again for some key points regarding the system design.

Good luck!

2021-10-18 14:10:57

The buffer tank alone, which should be avoided (even if it means discussions with the heating engineer), saves another 2k€. The effort for the heat pump is much lower. The heat generator, however, is often actually twice as expensive for a heat pump as it is for the boiler. In my case (retrofitting in an old building), after deducting the subsidy, there was a difference of just under €4000 between gas and heat pump. And for that money, I would have had to buy a buffer tank and have a gas connection installed...

2021-10-18 17:00:17

The problem with hydrogen is the underground efficiency...

But that is not the only problem. Hydrogen is the smallest molecule there is, which leads to it diffusing in or through many materials - for example, steel. This makes the materials brittle, and if oxygen is later passed through the same pipes, the whole thing can even explode. Therefore, suitable materials are needed for hydrogen for everything, especially for the pipes. A direct conversion of an existing natural gas pipeline network to hydrogen can be forgotten.

2021-10-18 19:35:38

Probably not. Everything has to work, and I want my peace. But I see the issue of dependency on fossil fuels similarly. I don’t feel like converting after 10/15 years. You don’t build a garden shed now, but a home for the next 50 years.

Do you think a heat pump and photovoltaic system will last 50 years? I would estimate a maximum of 15-20 years for any system; after that, you have to replace whatever it is.

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Newly built single-family house - gas or air heat pump + photovoltaics + storage?

hampshire

Tom1978

Hangman

Deliverer

stepfel

Georgian2019