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
Hello everyone,
I would like to revisit this topic.
About our house:
It’s a KFW 55 standard house, heating load approximately 3.5 kW, heated building volume about 500 m³ (18,000 ft³), size 140 m² (1,500 ft²), 2 adults and 2 children...
So far, we had planned for an LWZ 304 unit. This is no longer available, and we have been offered an LWZ 504 free of charge.
However, I feel that the 504 might be much too large.
The question is, is that correct? And if so, is it a problem?
Due to structural preparations, only an LWZ unit is possible, and I find it difficult to decide whether, despite possible oversizing, the 504 would still be the right choice under these conditions. What do you think?
Kind regards
I would like to revisit this topic.
About our house:
It’s a KFW 55 standard house, heating load approximately 3.5 kW, heated building volume about 500 m³ (18,000 ft³), size 140 m² (1,500 ft²), 2 adults and 2 children...
So far, we had planned for an LWZ 304 unit. This is no longer available, and we have been offered an LWZ 504 free of charge.
However, I feel that the 504 might be much too large.
The question is, is that correct? And if so, is it a problem?
Due to structural preparations, only an LWZ unit is possible, and I find it difficult to decide whether, despite possible oversizing, the 504 would still be the right choice under these conditions. What do you think?
Kind regards
A
A. Rösner2 May 2019 10:44Hello everyone,
I have had the LWZ 504 installed for one month now, and based on everything I have read here, it is installed correctly. It is decoupled on a metal base, with two fairly large silencers for supply and exhaust air, programmed and adjusted by a Siebel-Eltron technician.
At the moment, I am completely frustrated by the noise generated by this "monster."
The system can be heard throughout the entire house—day and night—24 hours a day, 365 days a year—always(!)—unless I manually switch it off.
We only operate the ventilation function of the LWZ 504 at the lowest level 1 because the noise otherwise interferes even with watching TV—let alone concentrating while working in the office or falling asleep peacefully in the evening. The setting 2, which is actually intended for normal air exchange, is no longer used by us because the unit runs significantly louder at this level. The ventilation ducts carry the sound into every single room. The supply air is significantly louder than the exhaust air, meaning the noise is highest in living areas (living room, bedroom, guest room, children’s room, office). In bathrooms and kitchen, on the other hand, hardly anything can be heard (at least at level 1).
Currently barely bearable is the noise when the heat pump (heating function) is running, which can also be the case 24 hours a day during the cold months. Right in front of the unit, it sounds like a vacuum cleaner—and this noise also spreads throughout the whole house. Of course, it is not as loud, but it is a clearly audible low-frequency hum, buzzing, and whooshing. It simply sounds unpleasant and disturbing, as if the entire house is resonating with heating/ventilation noise—typical “basement noises.”
I am not yet sure whether anything can still be improved regarding the noise level of our system; I am in contact with the installing specialist company, but they are very reserved. As of today, I can only advise against installing this device (LWZ 504) because of the noise it produces.
Best regards,
A. Rösner
I have had the LWZ 504 installed for one month now, and based on everything I have read here, it is installed correctly. It is decoupled on a metal base, with two fairly large silencers for supply and exhaust air, programmed and adjusted by a Siebel-Eltron technician.
At the moment, I am completely frustrated by the noise generated by this "monster."
The system can be heard throughout the entire house—day and night—24 hours a day, 365 days a year—always(!)—unless I manually switch it off.
We only operate the ventilation function of the LWZ 504 at the lowest level 1 because the noise otherwise interferes even with watching TV—let alone concentrating while working in the office or falling asleep peacefully in the evening. The setting 2, which is actually intended for normal air exchange, is no longer used by us because the unit runs significantly louder at this level. The ventilation ducts carry the sound into every single room. The supply air is significantly louder than the exhaust air, meaning the noise is highest in living areas (living room, bedroom, guest room, children’s room, office). In bathrooms and kitchen, on the other hand, hardly anything can be heard (at least at level 1).
Currently barely bearable is the noise when the heat pump (heating function) is running, which can also be the case 24 hours a day during the cold months. Right in front of the unit, it sounds like a vacuum cleaner—and this noise also spreads throughout the whole house. Of course, it is not as loud, but it is a clearly audible low-frequency hum, buzzing, and whooshing. It simply sounds unpleasant and disturbing, as if the entire house is resonating with heating/ventilation noise—typical “basement noises.”
I am not yet sure whether anything can still be improved regarding the noise level of our system; I am in contact with the installing specialist company, but they are very reserved. As of today, I can only advise against installing this device (LWZ 504) because of the noise it produces.
Best regards,
A. Rösner
Hmm, I suggest checking the filters first (both at the ventilation unit and all in the rooms). If they are dirty, the system will run a bit louder. However, the difference is minimal and not really noticeable or disturbing. The system also gets slightly louder near the hot water supply, but again, this is not significant.
Overall, it sounds like something might still not be quite right. I’m quite sensitive; in our previous newly built apartment, I could hear the gas boiler installed on the other side of the four-unit building. I can’t hear the 504, and it’s actually closer to our bedroom.
What air exchange rates do you have set for each fan speed? What are the base point and incline? What temperature is your hot water?
Overall, it sounds like something might still not be quite right. I’m quite sensitive; in our previous newly built apartment, I could hear the gas boiler installed on the other side of the four-unit building. I can’t hear the 504, and it’s actually closer to our bedroom.
What air exchange rates do you have set for each fan speed? What are the base point and incline? What temperature is your hot water?
What I find quite strange is that the heat pump runs continuously for 24 hours?! Ours only runs for about 2 hours a day for heating during the transitional season and another 1.5 hours for hot water. The rest of the day, nothing happens except for ventilation. And it’s really quiet, even on stage 2 out of 3.
Something definitely doesn’t seem right here?!
Something definitely doesn’t seem right here?!
seth0487 schrieb:
Nothing else happens there the rest of the day except ventilation. And it's really quiet. Even at level 2 out of 3. Something definitely seems off?! At level 3, with 300 m3/h (176 cfm), you can already hear something near the valves. Level 2 is 160 m3/h (94 cfm) during the day, and at night level 1 is 110 m3/h (65 cfm).Similar topics