ᐅ Choosing a Mechanical Ventilation with Heat Recovery System Manufacturer – How to Approach?
Created on: 5 Oct 2020 22:38
T
ts-mc
Hello, I’m Matthias,
I am currently in the final stages of planning (hopefully soon submitting the building permit).
I want to build to the KfW55 standard, which requires a controlled residential ventilation system. But primarily for comfort reasons!
At first, I quickly considered Helios, then Zehnder... shortly after that Komfovent. And so it went on from brand to brand. Since this is a major cost factor, I want to do everything right and take some more time to consider your experiences as well.
What is the best way to proceed? How do I decide on a manufacturer? Where should I start?
Which criteria should I consider besides the following?:
- Operating noise (I am very sensitive)
- KNX integration
- Intelligent, room- and demand-based control (VOC & humidity)
- Cooling/air dehumidification in summer (via earth tubes around the house/basement + heat exchanger in the supply air)
- Good accessibility for cleaning
//Key data\\
160m² (1722 ft²)
2.5 floors
3 bedrooms + 1 bathroom + 1 toilet
Open plan living-dining-kitchen area
Basement
Underfloor heating (gas)
That’s a lot of questions... I didn’t want to scatter this piece by piece. Any constructive advice is welcome.
I am currently in the final stages of planning (hopefully soon submitting the building permit).
I want to build to the KfW55 standard, which requires a controlled residential ventilation system. But primarily for comfort reasons!
At first, I quickly considered Helios, then Zehnder... shortly after that Komfovent. And so it went on from brand to brand. Since this is a major cost factor, I want to do everything right and take some more time to consider your experiences as well.
What is the best way to proceed? How do I decide on a manufacturer? Where should I start?
Which criteria should I consider besides the following?:
- Operating noise (I am very sensitive)
- KNX integration
- Intelligent, room- and demand-based control (VOC & humidity)
- Cooling/air dehumidification in summer (via earth tubes around the house/basement + heat exchanger in the supply air)
- Good accessibility for cleaning
//Key data\\
160m² (1722 ft²)
2.5 floors
3 bedrooms + 1 bathroom + 1 toilet
Open plan living-dining-kitchen area
Basement
Underfloor heating (gas)
That’s a lot of questions... I didn’t want to scatter this piece by piece. Any constructive advice is welcome.
Ybias78 schrieb:
Why do you need a mechanical ventilation system for KfW 55?What’s wrong with that? We’ll never go without one again.
Even with KNX, you can operate any system without needing a specific integration. The technology itself is straightforward, so there’s nothing complex to maintain. It simply adds an interface. Of course, using a "proper gateway" gives you access to many parameters and fine adjustments beyond the manual controls, but you have to decide for yourself whether the additional cost is worth it.
A few actuator channels and some sensors are enough to control and monitor almost anything, even without native KNX integration.
CO2 and VOC sensors are a huge advantage in any system, no matter how it is controlled or managed overall. However, the saying applies here: "You don’t miss what you don’t know."
A few actuator channels and some sensors are enough to control and monitor almost anything, even without native KNX integration.
CO2 and VOC sensors are a huge advantage in any system, no matter how it is controlled or managed overall. However, the saying applies here: "You don’t miss what you don’t know."
blackm88 schrieb:
What’s the downside? We never go without it anymore.He wrote that for controlled ventilation standard 55 you need a controlled ventilation system. That’s not correct. For KfW 40 and 40+ standards, you can’t do without one. But for controlled ventilation standard 55, you don’t need a controlled ventilation system. Instead of spending over 12,000€ (about 13,000 USD), you’d be better off investing in a photovoltaic system.
Ybias78 schrieb:
But for controlled residential ventilation 55, you don’t need controlled residential ventilation. For the 12,000 €+ you’d better get a photovoltaic system. I completely disagree. Photovoltaics can never provide me the comfort that I get from controlled residential ventilation. Everyone just has different priorities.
IMHO: Controlled residential ventilation first, then (if there is money left) photovoltaics, not the other way around.
But it doesn’t have to be KNX right away. There are heat pumps and controlled residential ventilation systems that communicate via BUS. These are also eligible for subsidies. Unfortunately, you usually have to stick with one manufacturer. For me, it will now be Vaillant, for example.