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,
we have been using the THZ304 (by Tecalor, identical to the LWZ304) for almost 2 years now and are very satisfied with it so far.
The main difference between the 304 and the 505, as I understand it in layman’s terms, is that the 504 has a higher heating capacity and better energy efficiency and is slightly larger in size.
For our house (154m² (1,658 square feet) with one heating circuit for underfloor heating), the 304 is completely sufficient, so we did not consider the higher price worthwhile.
@ Daniela and ares:
Regarding noise, I just wanted to let you know that most of the noise comes from the ventilation. The system being quiet without ventilation running doesn’t really mean much. Unfortunately, it gets a bit louder when the ventilation is turned on.
Over the weekend, we reprogrammed the system so that the ventilation is off during the day and runs at level 2 at night.
Why?
When it is warm outside during the day, the ventilation brings warm air into the house, and because of the tight building envelope, it is very difficult to get it out again, making the house too warm in summer.
Last summer, we could hardly sleep at night because it was so warm inside, so this summer we want to try a different approach and simply prevent the warm air from entering during the day.
After reprogramming the system, we were quite surprised at how quiet the heat pump is without the ventilation running. Now it is barely noticeable, except, of course, when it is heating up domestic hot water. Before, it was humming constantly.
I don’t mean to worry you, but just to take away the illusion that the heat pump is really as quiet as Daniela had assumed. Even with ventilation on, the system doesn’t bother us in everyday life. When we close the utility room door (a standard interior door on the ground floor), we hardly hear the system on the ground floor, and upstairs, it is silent.
we have been using the THZ304 (by Tecalor, identical to the LWZ304) for almost 2 years now and are very satisfied with it so far.
The main difference between the 304 and the 505, as I understand it in layman’s terms, is that the 504 has a higher heating capacity and better energy efficiency and is slightly larger in size.
For our house (154m² (1,658 square feet) with one heating circuit for underfloor heating), the 304 is completely sufficient, so we did not consider the higher price worthwhile.
@ Daniela and ares:
Regarding noise, I just wanted to let you know that most of the noise comes from the ventilation. The system being quiet without ventilation running doesn’t really mean much. Unfortunately, it gets a bit louder when the ventilation is turned on.
Over the weekend, we reprogrammed the system so that the ventilation is off during the day and runs at level 2 at night.
Why?
When it is warm outside during the day, the ventilation brings warm air into the house, and because of the tight building envelope, it is very difficult to get it out again, making the house too warm in summer.
Last summer, we could hardly sleep at night because it was so warm inside, so this summer we want to try a different approach and simply prevent the warm air from entering during the day.
After reprogramming the system, we were quite surprised at how quiet the heat pump is without the ventilation running. Now it is barely noticeable, except, of course, when it is heating up domestic hot water. Before, it was humming constantly.
I don’t mean to worry you, but just to take away the illusion that the heat pump is really as quiet as Daniela had assumed. Even with ventilation on, the system doesn’t bother us in everyday life. When we close the utility room door (a standard interior door on the ground floor), we hardly hear the system on the ground floor, and upstairs, it is silent.
Hello everyone,
Thanks for your feedback!
@seth0487:
The main difference between the LWZ 304 and the LWZ 504 is primarily the inverter technology. It regulates the output more efficiently. I'll explain this in simple terms based on my understanding. While other heat pumps operate either at full power or off, the inverter technology adjusts the output to exactly what is needed at the moment. This might be easier to understand from the product description on the Stiebel Eltron website:
“The compact ventilation integral system LWZ 504 with Passive House certification offers all the comfort worthy of an energy-efficient home. The system draws energy for comfortable room temperatures and warm water from the outside air. Modern ventilation management ensures that the heat stays inside the house. It recovers up to 90% of the heat from the exhaust air. This allows for a pleasant, healthy atmosphere and high efficiency to be combined perfectly. The inverter technology also guarantees high efficiency by producing exactly the amount of heat currently required. High performance levels can be achieved even at low temperatures.
A modern high-efficiency circulation pump and excellent insulation of the hot water storage tank contribute to economical energy use. Those who want to become even more independent from rising energy costs can operate the LWZ 504 with self-generated photovoltaic power using the appropriate accessory (ISG plus). The large, intuitive matrix display ensures that the modern technology in the award-winning design is easy to operate.”
I will report on the noise level once the ventilation system is up and running, as well as how the cooling function works. It was important to us to be able to lower the temperatures by a few degrees so it doesn’t get too warm. It is also crucial to consider some things from the start regarding insulation and the installation of ventilation ducts, so they don’t produce noise or become audible. Our professional installer said that a well-installed ventilation system should be inaudible or only minimally audible.
@Teyla: The 304 can also cool, right? At least that’s what the website says. Or did you decide not to use that feature? Since it gets too warm for you, that would be a useful option.
Our 160m² (1,722 sq ft) are all on one level. The LWZ 504 is located in the utility room. It is important to ensure that the screed is properly sound-decoupled. We also chose a soundproof door to the living area because I wanted to be sure not to hear the noise from all the equipment. We can’t even hear the washing machine when it’s running at full power, which is great.
Best regards
Daniela
Thanks for your feedback!
@seth0487:
The main difference between the LWZ 304 and the LWZ 504 is primarily the inverter technology. It regulates the output more efficiently. I'll explain this in simple terms based on my understanding. While other heat pumps operate either at full power or off, the inverter technology adjusts the output to exactly what is needed at the moment. This might be easier to understand from the product description on the Stiebel Eltron website:
“The compact ventilation integral system LWZ 504 with Passive House certification offers all the comfort worthy of an energy-efficient home. The system draws energy for comfortable room temperatures and warm water from the outside air. Modern ventilation management ensures that the heat stays inside the house. It recovers up to 90% of the heat from the exhaust air. This allows for a pleasant, healthy atmosphere and high efficiency to be combined perfectly. The inverter technology also guarantees high efficiency by producing exactly the amount of heat currently required. High performance levels can be achieved even at low temperatures.
A modern high-efficiency circulation pump and excellent insulation of the hot water storage tank contribute to economical energy use. Those who want to become even more independent from rising energy costs can operate the LWZ 504 with self-generated photovoltaic power using the appropriate accessory (ISG plus). The large, intuitive matrix display ensures that the modern technology in the award-winning design is easy to operate.”
I will report on the noise level once the ventilation system is up and running, as well as how the cooling function works. It was important to us to be able to lower the temperatures by a few degrees so it doesn’t get too warm. It is also crucial to consider some things from the start regarding insulation and the installation of ventilation ducts, so they don’t produce noise or become audible. Our professional installer said that a well-installed ventilation system should be inaudible or only minimally audible.
@Teyla: The 304 can also cool, right? At least that’s what the website says. Or did you decide not to use that feature? Since it gets too warm for you, that would be a useful option.
Our 160m² (1,722 sq ft) are all on one level. The LWZ 504 is located in the utility room. It is important to ensure that the screed is properly sound-decoupled. We also chose a soundproof door to the living area because I wanted to be sure not to hear the noise from all the equipment. We can’t even hear the washing machine when it’s running at full power, which is great.
Best regards
Daniela
@D.Gerner
When installing the LWZ 504, you receive a new build subsidy of 1,500 euros. Our contractor took care of this together with us. It is important that the application is submitted before construction starts, so make sure to arrange this in time! I first gathered information here (MAP subsidy calculator), and 1,500 euros was confirmed, so it matched perfectly.
Best regards
Daniela
When installing the LWZ 504, you receive a new build subsidy of 1,500 euros. Our contractor took care of this together with us. It is important that the application is submitted before construction starts, so make sure to arrange this in time! I first gathered information here (MAP subsidy calculator), and 1,500 euros was confirmed, so it matched perfectly.
Best regards
Daniela
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