ᐅ Air-to-water heat pump + controlled indoor ventilation system (central ventilation unit)
Created on: 3 Nov 2020 19:20
E
exto1791
Hello everyone,
Here are some brief details from our side:
- KFW 55 single-family house with 160m² (1,722 sq ft) and basement
- 2 full storeys with a hipped roof
- Currently 2 people – hopefully 4 people in a few years
We are close to signing the contract but still very uncertain about one topic because we have received very little input in this area.
It concerns the models and integration of our air-to-water heat pump and the mechanical ventilation system with heat recovery (central ventilation system):
The following options were offered by our general contractor:
Option 1:
- Compact unit – mechanical ventilation with heat recovery + air-to-water heat pump in one device --> Brand/Model: Tecalor THZ 504 SOL
--> The air-to-water heat pump is included in the house price --> additional costs of €8,000 (for the mechanical ventilation system) would apply if we choose this unit.
Option 2:
- Air-to-water heat pump installed outdoors + central ventilation system as a separate unit --> Brand/Model air-to-water heat pump: Tecalor TTL 7.6 ACS
--> The air-to-water heat pump is included in the house price --> additional costs of €12,000 (for the mechanical ventilation system) would apply --> Here we are apparently free to choose the ventilation model – we would have to see what the trade offers us.
Option 3:
- Air-to-water heat pump installed indoors + central ventilation system as a separate unit --> Brand/Model air-to-water heat pump: Tecalor TTL 9.5 I
--> The air-to-water heat pump is included in the house price --> additional costs of €12,000 (for the mechanical ventilation system) would apply --> Here we are apparently free to choose the ventilation model – we would have to see what the trade offers us.
Does anyone have experience with the general differences between indoor and outdoor installations? Which is better? Both models seem to be at the same price.
Both are supposed to achieve a seasonal performance factor (SPF) of 4.5 and are eligible for government subsidies under BAFA.
Does anyone have experience specifically with these devices?
Is €12,000 a reasonable estimate for the mechanical ventilation system? Will this get me a good system? Are there any recommended models or manufacturers for this?
Also the question arises:
--> Are these “compact units” actually any good? Does anyone know this device? Is this the “future”? This option would effectively save us €4,000.
Here are some brief details from our side:
- KFW 55 single-family house with 160m² (1,722 sq ft) and basement
- 2 full storeys with a hipped roof
- Currently 2 people – hopefully 4 people in a few years
We are close to signing the contract but still very uncertain about one topic because we have received very little input in this area.
It concerns the models and integration of our air-to-water heat pump and the mechanical ventilation system with heat recovery (central ventilation system):
The following options were offered by our general contractor:
Option 1:
- Compact unit – mechanical ventilation with heat recovery + air-to-water heat pump in one device --> Brand/Model: Tecalor THZ 504 SOL
--> The air-to-water heat pump is included in the house price --> additional costs of €8,000 (for the mechanical ventilation system) would apply if we choose this unit.
Option 2:
- Air-to-water heat pump installed outdoors + central ventilation system as a separate unit --> Brand/Model air-to-water heat pump: Tecalor TTL 7.6 ACS
--> The air-to-water heat pump is included in the house price --> additional costs of €12,000 (for the mechanical ventilation system) would apply --> Here we are apparently free to choose the ventilation model – we would have to see what the trade offers us.
Option 3:
- Air-to-water heat pump installed indoors + central ventilation system as a separate unit --> Brand/Model air-to-water heat pump: Tecalor TTL 9.5 I
--> The air-to-water heat pump is included in the house price --> additional costs of €12,000 (for the mechanical ventilation system) would apply --> Here we are apparently free to choose the ventilation model – we would have to see what the trade offers us.
Does anyone have experience with the general differences between indoor and outdoor installations? Which is better? Both models seem to be at the same price.
Both are supposed to achieve a seasonal performance factor (SPF) of 4.5 and are eligible for government subsidies under BAFA.
Does anyone have experience specifically with these devices?
Is €12,000 a reasonable estimate for the mechanical ventilation system? Will this get me a good system? Are there any recommended models or manufacturers for this?
Also the question arises:
--> Are these “compact units” actually any good? Does anyone know this device? Is this the “future”? This option would effectively save us €4,000.
I would like to revive this thread as we need to decide this week which heating system to choose:
Is there any advantage to a fully indoor installation? We have a basement and plenty of space, so the only benefit of an indoor setup should be the appearance (no "ugly" outdoor unit) – is that correct?
Currently, we are leaning towards two separate units because of the disadvantages already mentioned with combination units. Since we have enough space, the only benefit of a combination unit is the slightly lower price. However, the benefits of two separate units outweigh this, so we are tending towards a split system (i.e., outdoor installation).
Would you agree with this?
Regarding the ventilation system: Our general contractor said that with Tecalor, both sheet metal ducts and plastic ducts are used (Viessmann apparently now only installs plastic ducts). Our heating installer will generally install sheet metal ducts unless we specifically ask otherwise. What do you think about this? Should we prefer sheet metal or plastic ducts? According to the GC, plastic ducts cost about €1,000 (approximately $1,100) more. The plastic ducts are apparently rounded, while the sheet metal ducts are bent or squared.
An enthalpy heat exchanger is included for us – are there any other important details we should consider? Can you recommend a specific Tecalor model? Or are there standard models in this category? I would like to be a bit more prepared before our meeting… Heating systems are a very important topic for me, but as a layperson, they are still somewhat "uncertain."
Is there any advantage to a fully indoor installation? We have a basement and plenty of space, so the only benefit of an indoor setup should be the appearance (no "ugly" outdoor unit) – is that correct?
Currently, we are leaning towards two separate units because of the disadvantages already mentioned with combination units. Since we have enough space, the only benefit of a combination unit is the slightly lower price. However, the benefits of two separate units outweigh this, so we are tending towards a split system (i.e., outdoor installation).
Would you agree with this?
Regarding the ventilation system: Our general contractor said that with Tecalor, both sheet metal ducts and plastic ducts are used (Viessmann apparently now only installs plastic ducts). Our heating installer will generally install sheet metal ducts unless we specifically ask otherwise. What do you think about this? Should we prefer sheet metal or plastic ducts? According to the GC, plastic ducts cost about €1,000 (approximately $1,100) more. The plastic ducts are apparently rounded, while the sheet metal ducts are bent or squared.
An enthalpy heat exchanger is included for us – are there any other important details we should consider? Can you recommend a specific Tecalor model? Or are there standard models in this category? I would like to be a bit more prepared before our meeting… Heating systems are a very important topic for me, but as a layperson, they are still somewhat "uncertain."
Well, a machine like that naturally produces some noise. I prefer to keep it outside where it doesn’t disturb anyone in our household. If everything is installed correctly, an indoor unit should work as well, but I have often heard about problems with vibrations being transmitted.