ᐅ Central ventilation system for both supply and exhaust instead of a central exhaust-only system
Created on: 17 Jan 2020 20:34
B
bvb09
Hello everyone,
After about 4 years, we are going to build our house a second time (wood frame construction, same type, same builder), and I won’t go into the reasons here. We are building the same house again (not a different one) because we were completely satisfied overall. However, we will make some small changes. I would also like some input from you on one major aspect:
In 2016, we built our house with a central exhaust ventilation system. The unit was installed in the attic and extracted air from all the wet rooms (2 bathrooms, utility room, and kitchen). The indoor climate was excellent and mostly free of drafts. There was only a slight draft in the living room on cold evenings. I then closed the ventilation opening there and eliminated the draft. The cost of the system was included in the total price.
Now we are considering installing a central mechanical supply and exhaust ventilation system instead, for an additional cost of 4,800 euros. It would be a Zehnder ComfoAir Q 350. The advantages I see are:
- Savings due to heat recovery (although minor; for our 130 m² (1,400 sq ft) home with 3 people, we used about 50 euros of gas per month)
- More comfort, as there would be no drafts
- Better appearance and sound insulation, as there would be no ventilation openings going outside
My former construction manager is currently on vacation, so I can’t ask him: Do you know if the system includes humidity recovery by default, or is that an additional device? What kind of extra cost should I expect?
Furthermore, I imagine that in 10 to 20 years, we might want to install a heat pump instead of the gas boiler, so the ventilation system should also be installed in the utility/technical room. Is this even possible, or would the ventilation system then have to be designed completely differently?
I would appreciate your opinions on this. Since we have been very satisfied with the exhaust ventilation system so far, I am unsure whether we should go for the upgrade.
Best regards,
Robin
After about 4 years, we are going to build our house a second time (wood frame construction, same type, same builder), and I won’t go into the reasons here. We are building the same house again (not a different one) because we were completely satisfied overall. However, we will make some small changes. I would also like some input from you on one major aspect:
In 2016, we built our house with a central exhaust ventilation system. The unit was installed in the attic and extracted air from all the wet rooms (2 bathrooms, utility room, and kitchen). The indoor climate was excellent and mostly free of drafts. There was only a slight draft in the living room on cold evenings. I then closed the ventilation opening there and eliminated the draft. The cost of the system was included in the total price.
Now we are considering installing a central mechanical supply and exhaust ventilation system instead, for an additional cost of 4,800 euros. It would be a Zehnder ComfoAir Q 350. The advantages I see are:
- Savings due to heat recovery (although minor; for our 130 m² (1,400 sq ft) home with 3 people, we used about 50 euros of gas per month)
- More comfort, as there would be no drafts
- Better appearance and sound insulation, as there would be no ventilation openings going outside
My former construction manager is currently on vacation, so I can’t ask him: Do you know if the system includes humidity recovery by default, or is that an additional device? What kind of extra cost should I expect?
Furthermore, I imagine that in 10 to 20 years, we might want to install a heat pump instead of the gas boiler, so the ventilation system should also be installed in the utility/technical room. Is this even possible, or would the ventilation system then have to be designed completely differently?
I would appreciate your opinions on this. Since we have been very satisfied with the exhaust ventilation system so far, I am unsure whether we should go for the upgrade.
Best regards,
Robin
N
nordbayer17 Jan 2020 21:14Buy an air-to-water heat pump with a seasonal performance factor above 4.5 and take advantage of the new BAFA subsidy.
Also, don’t forget about the KfW funding—it has become worthwhile again recently.
Zehnder offers an enthalpy heat exchanger for an additional cost, either installed from the start (if you’re lucky) or available as a retrofit that you can insert yourself. Alternatively, there is a CO2-based control system, but that is rather specialized.
So, now everyone is undoubtedly curious about the reasons for the new build. Was the bathroom tile color chosen wrong the first time? :-p
Also, don’t forget about the KfW funding—it has become worthwhile again recently.
Zehnder offers an enthalpy heat exchanger for an additional cost, either installed from the start (if you’re lucky) or available as a retrofit that you can insert yourself. Alternatively, there is a CO2-based control system, but that is rather specialized.
So, now everyone is undoubtedly curious about the reasons for the new build. Was the bathroom tile color chosen wrong the first time? :-p
The ventilation system is not directly connected to the heating, so you have flexibility in this regard.
Even if you plan to use gas now, you should design the underfloor heating system directly for a heat pump. Since conventional heaters are usually not capable of this, it is advisable to get involved in the planning yourself. Perform room-by-room heating load calculations, set target room temperatures, choose a low flow temperature, and focus primarily on the bathroom, ...
Even if you plan to use gas now, you should design the underfloor heating system directly for a heat pump. Since conventional heaters are usually not capable of this, it is advisable to get involved in the planning yourself. Perform room-by-room heating load calculations, set target room temperatures, choose a low flow temperature, and focus primarily on the bathroom, ...
What is certain now: for an additional cost of 8,990 (the gas connection and solar thermal system are omitted, as well as the Bafa subsidy), a Tecalor THZ 5.5 eco with 5.16 kW can be installed. Unfortunately, I do not know whether the price includes an enthalpy heat exchanger or not. Otherwise, the house price, as described above, includes a central exhaust ventilation system with a gas boiler and solar thermal system. Only the gas connection costing 3,451 would be charged additionally.
The Zehnder system is no longer an option for now (if I understood correctly, this also depends on the heating specialist). Should I pursue this further, is Zehnder better? What is the general opinion of Tecalor? Unfortunately, I am not familiar with the different systems or the technology, so it is difficult for me to form an opinion. I hope you can help me.
The Zehnder system is no longer an option for now (if I understood correctly, this also depends on the heating specialist). Should I pursue this further, is Zehnder better? What is the general opinion of Tecalor? Unfortunately, I am not familiar with the different systems or the technology, so it is difficult for me to form an opinion. I hope you can help me.
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