ᐅ LWZ 8 CS Premium Combination Unit with Air-to-Water Heat Pump, Controlled Ventilation System, and Hot Water Storage Tank
Created on: 6 Jul 2020 20:56
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Bauherr am L
Hello friends!
Originally, we were considering a ground-source heat pump because we thought that with an air-to-water heat pump we wouldn’t qualify for government subsidies.
However, during a discussion with our heating installer and a representative from Stiebel Eltron, we were told that we can meet the BAFA (Federal Office for Economic Affairs and Export Control) subsidy requirements even with an air-to-water heat pump, which would save us the significant extra costs for drilling.
We were now recommended the LWZ 8 CS Premium from Stiebel Eltron as a combined unit. Our heating load is 7.6 kW (calculated externally), so it would be suitable. What we like is that the LWZ 8 CS Premium does not require an outdoor unit.
Now my specific questions: In the conversation, the combined unit was strongly recommended. One argument was that the exhaust air from the integrated mechanical ventilation with heat recovery is also used for heating purposes, increasing energy efficiency. Additionally, everything is built into this one device, which supposedly reduces the installation effort and makes it easier for the technicians. From your point of view, is there any reason against choosing the combined unit?
The alternative would be three separate units (heat pump, whether ground-source or air-to-water / mechanical ventilation with heat recovery / hot water storage tank)...
Thanks
Originally, we were considering a ground-source heat pump because we thought that with an air-to-water heat pump we wouldn’t qualify for government subsidies.
However, during a discussion with our heating installer and a representative from Stiebel Eltron, we were told that we can meet the BAFA (Federal Office for Economic Affairs and Export Control) subsidy requirements even with an air-to-water heat pump, which would save us the significant extra costs for drilling.
We were now recommended the LWZ 8 CS Premium from Stiebel Eltron as a combined unit. Our heating load is 7.6 kW (calculated externally), so it would be suitable. What we like is that the LWZ 8 CS Premium does not require an outdoor unit.
Now my specific questions: In the conversation, the combined unit was strongly recommended. One argument was that the exhaust air from the integrated mechanical ventilation with heat recovery is also used for heating purposes, increasing energy efficiency. Additionally, everything is built into this one device, which supposedly reduces the installation effort and makes it easier for the technicians. From your point of view, is there any reason against choosing the combined unit?
The alternative would be three separate units (heat pump, whether ground-source or air-to-water / mechanical ventilation with heat recovery / hot water storage tank)...
Thanks
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Bauherr am L7 Jul 2020 09:34Mycraft schrieb:
No, of course not. It’s an extra. Most have it included "by default," but who knows what you’ll actually get there. So, is this bypass clearly recommended?
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Bauherr am L7 Jul 2020 10:43hegi___ schrieb:
The question is also what is the difference in efficiency regarding heat recovery?Hmm... according to the data on the Stiebel Eltron website, the only information available is "heat supply efficiency up to 90%". I couldn’t find anything else. I’m not sure if this refers to the mechanical ventilation with heat recovery system.
90% wouldn’t be more than what a regular mechanical ventilation with heat recovery system achieves, right? That would be somewhat disappointing, especially since it was said that the exhaust air from the mechanical ventilation system is further utilized by the air-to-water heat pump, recovering even more energy there...
Bauherr am L schrieb:
90% would not be much more than with a standard mechanical ventilation system with heat recovery, would it? That would be a bit disappointing, especially since it was said that the exhaust air from the mechanical ventilation system with heat recovery is also used by the air-to-water heat pump, thus recovering even more energy... I’m not sure what you’re expecting, but the integral unit is simply the three devices combined in one enclosure. So you essentially have a separate mechanical ventilation system with heat recovery, a separate heat pump, and a domestic hot water tank all neatly packaged together.
Accordingly, the performance values differ only slightly from those of the three individual units.
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Bauherr am L7 Jul 2020 20:48blackm88 schrieb:
We have the Tecalor THZ 504, which is identical to the LWZ 504 from Stiebel. The unit works perfectly...Could you provide a bit more information? What is your heating load? What are the supply and return temperatures? What is the annual performance factor? Any subsidies?
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