Hello everyone,
My husband and I attended a home exhibition today featuring a local timber house builder (Schleswig-Holstein) and there we learned about the Vestaxx window heating system.
Is there anyone here who has experience with the Vestaxx window heating?
At first, it sounds unusual to have the heating integrated into the windows. For the triple-glazed windows, a nanotechnology-based, invisible layer is applied to the inner surface of the innermost pane, which warms the glass up to 40 degrees Celsius (104°F) via infrared and heats the room. The warmth actually felt very comfortable, and the windows were completely cold on the outside (today’s temperature was below 10 degrees Celsius (50°F)). Allegedly, the Vestaxx window heating transfers 92% of its heat to the room, and the Technical University of Berlin has tested this Vestaxx window heating system and rated it positively. It appears to have been on the market only recently.
Overall, I find this quite interesting. It is significantly cheaper than other heating systems, allows individual control of each room, and unlike underfloor heating, it is very responsive.
Of course, this only makes sense in a low-energy house (the timber builder mainly constructs 40+ standard homes), as the system runs on electricity. In that case, the Vestaxx window heating is said to consume very little power.
This is my impression from the expo; of course, they want to sell the system.
What are your experiences with Vestaxx? Have you heard of this system before? Could it be an alternative to conventional heating? Does it have a future?
My husband and I attended a home exhibition today featuring a local timber house builder (Schleswig-Holstein) and there we learned about the Vestaxx window heating system.
Is there anyone here who has experience with the Vestaxx window heating?
At first, it sounds unusual to have the heating integrated into the windows. For the triple-glazed windows, a nanotechnology-based, invisible layer is applied to the inner surface of the innermost pane, which warms the glass up to 40 degrees Celsius (104°F) via infrared and heats the room. The warmth actually felt very comfortable, and the windows were completely cold on the outside (today’s temperature was below 10 degrees Celsius (50°F)). Allegedly, the Vestaxx window heating transfers 92% of its heat to the room, and the Technical University of Berlin has tested this Vestaxx window heating system and rated it positively. It appears to have been on the market only recently.
Overall, I find this quite interesting. It is significantly cheaper than other heating systems, allows individual control of each room, and unlike underfloor heating, it is very responsive.
Of course, this only makes sense in a low-energy house (the timber builder mainly constructs 40+ standard homes), as the system runs on electricity. In that case, the Vestaxx window heating is said to consume very little power.
This is my impression from the expo; of course, they want to sell the system.
What are your experiences with Vestaxx? Have you heard of this system before? Could it be an alternative to conventional heating? Does it have a future?
KingJulien9 May 2023 22:05WilderSueden schrieb:
Fan heatersBut then you’ll have so many kids again! And they cost... 🙄Pomodoro schrieb:
What a great idea that’s so badly miscalculated! We haven’t even gone through a full winter yet, so I can’t provide exact figures. Domestic hot water is generated with tankless water heaters, which works fine. No legionella issues! Any more questions?The 1960s called and want their heating system back.
But direct electric heating is apparently allowed again under the draft of the upcoming 202X building energy regulation (building energy law / building energy code) and even qualifies as 100% renewable because electricity falls from the sky.
Keep it safe and simple – yes, but direct electric heating only makes sense in a near-passive house with less than 10 kWh/m² (less than 1 kWh/ft²) residual heat demand. Tankless water heaters are not only bad for the power grid, but also not efficient to operate with a photovoltaic system. The cumbersome term “domestic hot water heat pump” is much more compatible in this regard, and as for hygiene, picking your nose is more dangerous.
Even though heat pump prices are currently the biggest ripoff ever, in the long run, direct electric heating and tankless water heaters in a GEG2020-standard house will be more expensive.
S
SliPkNoT184822 Jul 2024 09:13We are currently in discussions with several home construction companies, and as an alternative to underfloor heating combined with a heat pump, the option with Vestaxx plus BWWP was suggested. Since we have a large roof area, we can install up to 30 kWP photovoltaic modules. We aim for an energy standard below KfW40, ideally passive house standard. As someone who focuses on numbers, I would appreciate it if anyone could provide concrete data. We plan a fully electric household, meaning no fireplace, electric heating, and an electric vehicle (ID.Buzz). The points mentioned—investment costs, maintenance, quick response—are completely understandable to me. The house will have a central ventilation system with heat recovery, which will complete our concept. I would be glad to hear about any experiences with this.
R
RotorMotor22 Jul 2024 09:31@SliPkNoT1848 : Did you come up with any specific questions while reading this thread?
Otherwise, how much cheaper is the Vestax system compared to an air-to-water heat pump?
That way, you can calculate how much more electricity this option is allowed to consume.
Otherwise, how much cheaper is the Vestax system compared to an air-to-water heat pump?
That way, you can calculate how much more electricity this option is allowed to consume.
S
SliPkNoT184822 Jul 2024 09:46RotorMotor schrieb:
@SliPkNoT1848 : Did any specific questions come to your mind while reading this thread?
Otherwise, how much cheaper is the Vestax system compared to an air-to-water heat pump?
This way, you can calculate how much more electricity the option is allowed to consume.- Energy consumption relative to living space, especially from October to February
- Thermal comfort, since there is no underfloor heating – cold feet?
- Savings of about 25,000 EUR compared to an air-to-water heat pump plus underfloor heating
- Risk of excessively dry air?
- Integration into KNX system possible?
- How sensitive are the contacts?
- Why is the system not widely used at the moment?
N
nordanney22 Jul 2024 10:58SliPkNoT1848 schrieb:
why isn’t this system more widely used right now?I can give you an answer to that. It’s a niche product designed for very specific applications. Such as renovation when surface heating cannot be installed and when energy consumption must be especially low. It’s also used as a supplement to an existing heating system (for example, for the bathroom or because the underfloor heating doesn’t provide enough heat at very low temperatures). Or in new construction where the actual energy performance (not just calculated on paper) is significantly better than KfW 40 standards.You have to keep in mind that the electricity consumption is about 4-5 times higher than with a conventional heat pump. And it only works effectively if the overall energy demand is low to begin with. If my normal heating costs would be around €1,000 per year and then it jumps to €4,000–€5,000, the system is not viable at all.
If I only spend well under €400 per year on heating (my costs with a heat pump excluding hot water), then with the windows I might end up using €1,500–€1,800 per year. After about 20 years, the heat pump comes out ahead. For me, there’s also the improved living comfort with underfloor heating instead of radiators, and the possibility to use the underfloor heating system for gentle cooling as well.
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