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
Daniela schrieb:
That’s why we are considering installing a proper cooling module in the ventilation system. I have learned here that due to the low air exchange rate of the mechanical ventilation with heat recovery, this does not really help. If you have other information, please share.
Jenpa schrieb:
I have learned here that due to the low air exchange rate of the controlled residential ventilation system, it doesn't make a difference. If you have other information, please share it. Is 300 m³ per hour (approximately 176 cubic feet per minute) too little?!
blackm88 schrieb:
Is 300m³ per hour too little?! I have no clue about air exchange rates, I’m just repeating what I’ve picked up here. So I’m happy to be proven wrong. Preferably with solid evidence.
blackm88 schrieb:
Is 300 m³ per hour too little?! Yes, because a mechanical ventilation system with heat recovery (or a similar combined unit with ventilation) exchanges 300 m³ (about 350 yd³) throughout the whole house.
A small split air conditioning system for 20–30 m² (215–320 ft²) of living space moves and cools around 400 m³ (about 470 yd³) per hour dynamically.
That basically says it all.
For those who still find this unclear:
Roughly (and just as an illustration) for effective cooling in a 100 m² (1,075 ft²) house, you need moved air volumes of about 1,500–2,000 m³ (1,750–2,350 yd³) per hour.
So 300 m³ is truly just a drop in the bucket.
Cooling options via mechanical ventilation without corresponding air circulation and a suitable cooling capacity in the multiple kW range are nothing more than marketing gimmicks and sales tricks.
But with the 300 m³, the system very well fulfills its intended purpose: providing fresh air indoors without having to open the windows.
Air has a very low heat capacity. Therefore, a large volume of air is needed if you want to cool effectively.
300 m³ (10,600 ft³) corresponds to the volume of a 120 m² (1,290 ft²) house with a ceiling height of 2.5 m (8 ft). At 300 m³/h (10,600 ft³/h) of controlled residential ventilation, this would result in an air change rate of 1 for this house.
300 m³ (10,600 ft³) corresponds to the volume of a 120 m² (1,290 ft²) house with a ceiling height of 2.5 m (8 ft). At 300 m³/h (10,600 ft³/h) of controlled residential ventilation, this would result in an air change rate of 1 for this house.
H
hoernchenh15 Nov 2019 07:31Hello everyone,
We have also moved into our house a few weeks ago and have an LWZ-504. The heating program has, of course, already run, but the appointment with the service technician has not yet taken place. Now I have the problem that I can’t get any temperature into the house. The slope has been continuously lowered and is now at 0, and the base point has been raised step by step, now at 20°C (68°F). So I now have a straight line at 50°C (122°F) for HK1 and HK2. The heating program is set from Monday to Sunday, 00:00 to 24:00, and now and then the LWZ switches to heating mode and the pump symbol appears. However, the supply temperature is at 20°C (68°F) according to the info mode, and opened control valves obviously don’t help in this case.
Has anyone experienced a similar issue or can offer some advice? I’m a bit stuck here, and unfortunately, my plumber can’t really help me...
Good luck
Heiko
We have also moved into our house a few weeks ago and have an LWZ-504. The heating program has, of course, already run, but the appointment with the service technician has not yet taken place. Now I have the problem that I can’t get any temperature into the house. The slope has been continuously lowered and is now at 0, and the base point has been raised step by step, now at 20°C (68°F). So I now have a straight line at 50°C (122°F) for HK1 and HK2. The heating program is set from Monday to Sunday, 00:00 to 24:00, and now and then the LWZ switches to heating mode and the pump symbol appears. However, the supply temperature is at 20°C (68°F) according to the info mode, and opened control valves obviously don’t help in this case.
Has anyone experienced a similar issue or can offer some advice? I’m a bit stuck here, and unfortunately, my plumber can’t really help me...
Good luck
Heiko
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