Hello everyone,
We currently live in a house (built in 2015, rented) with the following energy consumption values:
We have looked into solar options (both photovoltaic and thermal) to support or power an air-source heat pump, but financially it doesn’t seem to add up. Additionally, our house will have a gable roof aligned exactly north-south, meaning one roof side faces east and the other west.
We currently live in a house (built in 2015, rented) with the following energy consumption values:
- Household electricity: 3,000 kWh per year
- Air-source heat pump: 4,300 kWh electricity per year, heating output 13,000 kWh
- Solar thermal system: 1,000 kWh thermal energy
We have looked into solar options (both photovoltaic and thermal) to support or power an air-source heat pump, but financially it doesn’t seem to add up. Additionally, our house will have a gable roof aligned exactly north-south, meaning one roof side faces east and the other west.
- For the photovoltaic system, I initially considered a battery so we wouldn’t have to feed electricity into the grid for very little compensation and could instead use the generated power for the air-source heat pump. However, such a battery quickly costs upwards of 6,000 euros; for that price, you could pay for gas for 8 years. In other words, even if it were a perfect battery that supplied all the electricity for the heat pump at no cost, it would need to last at least 8 years. This doesn’t even take into account that the air-source heat pump itself is also more expensive than the gas heating system.
- I am skeptical about solar thermal because during the summer months, when the sun is strongest, you actually need the least hot water. Electricity, at least household electricity, is always needed.
- Is it possible to install a gas heating system if you only build according to the energy-saving regulations (e.g., EnEV / energy performance requirements) without installing anything on the roof? Or would that not comply with the maximum allowed primary energy demand?
- What about using only an air-source heat pump (like we have now in our rental)? Somehow it is so expensive that it never really pays off compared to gas, regardless of whether you have photovoltaic or solar thermal on the roof. Gas is just too cheap...
J
junge_familie11 Mar 2018 11:20Nordlys schrieb:
Solar thermal is not that bad. It’s March now, and the daylight is enough for the system to provide all the hot water for two people.Really? Strange... I don’t know what our landlord installed on the roof (currently a south-facing roof), but there are 4 collectors, and according to the statistics, they produce about 1,000 kWh per year for hot water. That is roughly 7.5% of our total consumption of about 13,000 kWh.
Here it is again... the illogicality of the Energy Saving Ordinance!
If I were building new, I would make the effort to legally claim the possibility of an exemption that is also included in the Energy Saving Ordinance. (At least I would dive deeply into this matter and try.)
According to Mr. Konrad Fischer, the Energy Saving Ordinance CANNOT force you to install technology that does NOT pay off within 10 years.
This regulation is supposedly also anchored in the actual Energy Saving Ordinance.
That means; if you can prove that the extra costs to meet the Energy Saving Ordinance standard compared to a "conventional building method" do NOT pay off within 10 years, you can obtain an exemption.
And the fact that it usually does not pay off within 10 years is not doubted even here in the forum.
(Google “Konrad Fischer and Energy Saving Ordinance.” It only costs a bit of time. It’s also interesting. Either way.)
Let’s see what kind of criticism will be thrown at me now...
🙂
Reason for edit: unnecessary full quote removed.
If I were building new, I would make the effort to legally claim the possibility of an exemption that is also included in the Energy Saving Ordinance. (At least I would dive deeply into this matter and try.)
According to Mr. Konrad Fischer, the Energy Saving Ordinance CANNOT force you to install technology that does NOT pay off within 10 years.
This regulation is supposedly also anchored in the actual Energy Saving Ordinance.
That means; if you can prove that the extra costs to meet the Energy Saving Ordinance standard compared to a "conventional building method" do NOT pay off within 10 years, you can obtain an exemption.
And the fact that it usually does not pay off within 10 years is not doubted even here in the forum.
(Google “Konrad Fischer and Energy Saving Ordinance.” It only costs a bit of time. It’s also interesting. Either way.)
Let’s see what kind of criticism will be thrown at me now...
🙂
Reason for edit: unnecessary full quote removed.
F
Fightthenew11 Mar 2018 15:29And what if you skip underfloor heating and a heat pump, and instead use infrared panels as the primary heating source, combined with an instantaneous water heater and a photovoltaic system?
B
Baumfachmann12 Mar 2018 01:52Gas and solar thermal systems are simple, affordable, and straightforward. If the insulation is good, the energy consumption is minimal.
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