For our new build, we originally planned to install an air-source heat pump and generate the electricity for it, as well as part of our other electricity needs, with our own photovoltaic system and battery storage. After receiving two quotes, we now have some doubts. The lowest quote for a heat pump with 5.08 kW, a photovoltaic system with 5.1 kWp, and a battery with 5.12 kWh is €33,000. Should we rather choose a conventional gas heating system instead? That would definitely be cheaper. Or is that completely outdated now?
T
T_im_Norden6 May 2020 12:09We already pointed out the calculations on the first page.
@MayrCh please read carefully. I said "it doesn't have to be that much better."
It’s clear that, as a rule, renovation is better than new construction. Also, using things longer is important. Not every 15 years a new bathroom. A bathroom can last 40 years if properly maintained.
What should not be forgotten is that you always compare heat pump vs. gas. But the fact that solar thermal systems usually have to be installed with gas is often overlooked. They hardly bring any savings but cost a lot of money and essentially require a larger buffer tank.
It’s clear that, as a rule, renovation is better than new construction. Also, using things longer is important. Not every 15 years a new bathroom. A bathroom can last 40 years if properly maintained.
What should not be forgotten is that you always compare heat pump vs. gas. But the fact that solar thermal systems usually have to be installed with gas is often overlooked. They hardly bring any savings but cost a lot of money and essentially require a larger buffer tank.
Specki schrieb:
A complete renovation of an old building doesn’t necessarily have a significantly better environmental impact than an eco-friendly new build.Specki schrieb:
It’s clear that, as a rule, renovation is better than new construction.These two statements completely contradict each other. Please don’t come now with "case-by-case considerations," as those can be arbitrarily constructed.Specki schrieb:
You always just compare heat pumps versus gas.I’m not comparing anything; I’m questioning absurd theories and speculations.Specki schrieb:
It hardly saves anything but costs a lot of money and basically forces you to get a larger buffer tank.There is already some savings from a fixed diaphragm meter reading between May and September, but of course you won’t recover the roughly 8,000€ investment quickly. People do it because they have to, although there are probably ways to build without complying with the Energy Saving Ordinance for thermal insulation.Just an ideological question: What is “greener” now — the condensing boiler with a biogas tariff or the heat pump with a lignite (brown coal) tariff?
H
Heidi19656 May 2020 21:02T_im_Norden schrieb:
Even though this is quite far from the original topic, if you really want to act ecologically, you shouldn’t have built at all.
I always find it strange to argue for ecology and environmental protection on one hand, but then build a new house that inherently leaves a huge footprint. There was an old house on this site, built in 1951, still with the original plumbing, uninsulated, water in the basement, only kitchen, living room, and a bathroom used as a passage on the ground floor, bedrooms without a bathroom upstairs. We wanted a home suitable for seniors since we are already 55 and 61 years old respectively. That’s why we decided to demolish and build new.
H
Heidi19656 May 2020 21:08nordanney schrieb:
Do you have a cost comparison for us? There’s a lot of discussion here about consumption, expenses, ecology, etc.
1. What is the cost of a heat pump without photovoltaic?
2. What is the cost of a gas boiler without a heat pump, including gas connection and flue pipe?
3. What is the cost of a reasonable photovoltaic system (max. 9.9 kW without storage)?
4. Does the offer include underfloor heating with all accessories?
Then we can provide better answers. Regarding 1: The 5.08 kW (17,300 BTU) unit costs €9,990 net. The 10.7 kW (36,500 BTU) unit costs €15,975 net.
Regarding 2: Not yet requested.
Regarding 3: €9,671 net.
Regarding 4: The materials for the underfloor heating are charged separately.
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