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
hoernchenh schrieb:
Slope gradually lowered further and now set to 0, base point raised step by step, now 20 degreesBase point for what? Flow temperature?
If you set it like this without any slope, I would expect exactly 20 degrees flow temperature, assuming other settings do not completely prevent startup.
Was there even a commissioning to confirm that the system already takes the outside temperature into account?
guckuck2 schrieb:
If you set it like this and don't add any slope, I would expect exactly 20 degrees Celsius (68°F) flow temperature, as long as other settings don’t completely prevent startup. I would agree with that, and 20 degrees Celsius (68°F) is slightly too low at these temperatures. The values are completely off.
@hoernchenh
Just as a reference: We are using a base point of 2.0 and a slope of 0.30 on the 504.
Did you receive the manual?
This is what our heating curve looks like:
This is the result of two years of adjustments. Let’s see if we can go a bit lower now.
guckuck2 schrieb:
Does the system even take the outside temperature into account?Otherwise, the heating operation would not be active. It switches on as soon as the heating detects an outside temperature below the hysteresis of the summer operation. So, the heating basically wants to heat, but it only does so until the return flow temperature reaches 22°C (72°F), which is not enough to warm a house.
ares83 schrieb:
Otherwise, the heating operation would not be active. It starts as soon as the heating system detects an outside temperature below the hysteresis of the summer mode. So the heating system basically wants to heat, but it only does so until the return temperature reaches 22°C (72°F), which is not enough to warm a house.I’m just not familiar with that control system. For example, my system can be set to constant temperature mode (or room temperature control), meaning a fixed value.
But the system does have a nice display.
P
pagoni202013 Nov 2020 20:42seth0487 schrieb:
In our case, the LWZ304 is also installed on a metal (?) pedestal in the utility room on the ground floor. Sound dampers are installed as well. With the door closed, you can hardly hear anything. You also don’t hear any noise from the heating through the ventilation. Only a slight rustling from level 2 upwards, but that doesn’t bother me at all, even in the bedroom right next to the bed.
So far, I’m very happy with the choice of heating system! One question: Do you use it basically as a controlled residential ventilation system AND as an air heating unit?
Are you still satisfied?
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