ᐅ Integrated unit Stiebel Eltron LWZ 504 with central supply air system
Created on: 19 Oct 2014 20:20
D
DJCOON
Hello dear forum members,
Through a variety of professional magazines I ordered for our new build in spring 2015, I came across the air-to-water heat pump LWZ 504 from Stibel Eltron. According to Stibel, this unit offers the following:
"The compact LWZ 504 provides all the comfort expected from an energy-efficient house. The system draws energy for pleasant indoor temperatures and hot water from the outside air. Modern ventilation management ensures that the heat stays inside the building. It recovers up to 90% of the heat from the exhaust air. This allows a comfortable, healthy atmosphere to be combined with high efficiency. The demand-controlled inverter technology also ensures high efficiency. It produces exactly the amount of heat currently needed. High performance values can be achieved even at low temperatures. Energy-saving operation is supported by the modern high-efficiency heating circulation pump and excellent insulation of the hot water storage tank. For those who want to be even more independent from rising energy costs, the LWZ 504 can be operated with self-generated photovoltaic electricity using the appropriate accessories (ISG + SEE). The large, intuitive matrix display ensures that the modern technology in the award-winning design is easy to operate."
Key Features
I understand that this great system naturally comes at a price, but I would like to ask the experts among you—air-to-water heat pump owners as well as heating engineers—for advice or experience with such units. Ideally, it would be great if someone already has this exact pump installed in their basement :-)
Thank you in advance for your responses.
Best regards,
Martin
Through a variety of professional magazines I ordered for our new build in spring 2015, I came across the air-to-water heat pump LWZ 504 from Stibel Eltron. According to Stibel, this unit offers the following:
"The compact LWZ 504 provides all the comfort expected from an energy-efficient house. The system draws energy for pleasant indoor temperatures and hot water from the outside air. Modern ventilation management ensures that the heat stays inside the building. It recovers up to 90% of the heat from the exhaust air. This allows a comfortable, healthy atmosphere to be combined with high efficiency. The demand-controlled inverter technology also ensures high efficiency. It produces exactly the amount of heat currently needed. High performance values can be achieved even at low temperatures. Energy-saving operation is supported by the modern high-efficiency heating circulation pump and excellent insulation of the hot water storage tank. For those who want to be even more independent from rising energy costs, the LWZ 504 can be operated with self-generated photovoltaic electricity using the appropriate accessories (ISG + SEE). The large, intuitive matrix display ensures that the modern technology in the award-winning design is easy to operate."
Key Features
- Excellent suitability for new buildings
- Energy-saving inverter technology
- Ventilation with up to 90% heat recovery
- High domestic hot water comfort with well-insulated 235-liter (62 gallon) storage tank
- Compatible with solar systems
- Stable, sound-optimized housing construction
- Built-in high-efficiency heating circulation pump
I understand that this great system naturally comes at a price, but I would like to ask the experts among you—air-to-water heat pump owners as well as heating engineers—for advice or experience with such units. Ideally, it would be great if someone already has this exact pump installed in their basement :-)
Thank you in advance for your responses.
Best regards,
Martin
@mertmk3 You have to distinguish:
In pure ventilation mode, you can't hear it at all in the rooms, not even at level 3. Of course, you can hear it in the utility room. We only hear it in the rooms when the heating is on. Then you can hear a rushing sound and a very slight humming, which we do not find disturbing in our very quiet environment.
In pure ventilation mode, you can't hear it at all in the rooms, not even at level 3. Of course, you can hear it in the utility room. We only hear it in the rooms when the heating is on. Then you can hear a rushing sound and a very slight humming, which we do not find disturbing in our very quiet environment.
B
Bau2016inRGB9 Nov 2017 13:44@mertmk3
Our system is installed on a decoupled platform. Whether it was absolutely necessary in the basement, I have no idea, but it certainly doesn't hurt.
Our system is installed on a decoupled platform. Whether it was absolutely necessary in the basement, I have no idea, but it certainly doesn't hurt.
In our house, the LWZ304 is also installed on a metal(?) pedestal in the utility room on the ground floor. Sound dampers are also installed. With the door closed, you can hardly hear anything. You don’t hear any noise from the heating system through the ventilation either. Only a slight rustling from level 2 onwards, but even that is not disturbing at all, even in the bedroom right next to the bed.
So far, I am very satisfied with the choice of heating system!
So far, I am very satisfied with the choice of heating system!
Our THZ 504 is installed in the basement, isolated from the screed on its own platform. We have also placed the silencers for the supply and exhaust air between the distributor and the unit itself.
The heating technician installed it during the shell construction phase, tested the underfloor heating for leaks, and approved it for the screed installation. The screed heating was programmed by the installer to run warm without ventilation!
Commissioning and hydraulic balancing were done during heating.
One week after moving in, a technician from Stiebel Eltron came directly to program everything with a laptop and measured and adjusted the air intakes and exhaust valves in the rooms. This was precisely calculated in advance at the factory.
We received a briefing afterwards.
We set the domestic hot water temperature to 43°C (109°F), with a hysteresis of 2.0, which is more than enough for showering, etc. Also, the water is always circulating.
I have already adjusted the underfloor heating myself, modifying the slope and base point.
If you take the time to work with the system, you can find many parameters to optimize (professional knowledge required).
Current consumption of the entire system in September and October is under 200 kWh per month (heat pump, ventilation, control). KfW55 standard, 165 m² (1,776 ft²), currently 2 occupants. The house is located at 940 m (3,084 ft) above sea level, and it has already snowed.
The heating technician installed it during the shell construction phase, tested the underfloor heating for leaks, and approved it for the screed installation. The screed heating was programmed by the installer to run warm without ventilation!
Commissioning and hydraulic balancing were done during heating.
One week after moving in, a technician from Stiebel Eltron came directly to program everything with a laptop and measured and adjusted the air intakes and exhaust valves in the rooms. This was precisely calculated in advance at the factory.
We received a briefing afterwards.
We set the domestic hot water temperature to 43°C (109°F), with a hysteresis of 2.0, which is more than enough for showering, etc. Also, the water is always circulating.
I have already adjusted the underfloor heating myself, modifying the slope and base point.
If you take the time to work with the system, you can find many parameters to optimize (professional knowledge required).
Current consumption of the entire system in September and October is under 200 kWh per month (heat pump, ventilation, control). KfW55 standard, 165 m² (1,776 ft²), currently 2 occupants. The house is located at 940 m (3,084 ft) above sea level, and it has already snowed.
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