A very good day to the community.
I must mention beforehand that I am a novice on this topic and do not have a lot of information. I understand that the lack of details may limit your input. Nevertheless, I would be very grateful if you could share your opinion based on the available information.
Thank you in advance for your support.
The issue concerns a single-family house where underfloor heating was recently installed from the basement to the attic (i.e., basement, ground floor, first floor, attic). Previously, there were radiators, which have now been removed. The area is approximately 125 m² (1350 sq ft).
In the basement, there is a Viessmann Vitodens 200-W boiler. There is also a Viessmann hot water storage tank (if this is relevant). Each room has an individual analog room thermostat.
The current problem is as follows: The rooms only become lukewarm, even though the thermostats are set to at least 23°C (73°F). When the outside temperature is just above 0°C (32°F) in the morning, the rooms show about 19°C (66°F) according to the weather station.
Various settings have been adjusted on the Vitodens 200-W so far without success. Examples:
Additionally, a Yonos PICO plus 25/1-4 circulation pump was installed. The displayed flow rate varies depending on how many rooms are being heated. With only a few rooms (1–2) heated, the flow rate shows between 0 and 0.2 m³/h. I do not know whether this is a good or bad value.
Now the discussions have started:
All very costly in today’s times. Due to poor experiences with some heating technicians and the various opinions about what is actually necessary, I find it very difficult to decide on a direction.
Therefore, I would be very grateful if you could simply share your opinion or gut feeling based on this information.
It seems to me that too much heat is lost before it even reaches the rooms. Hence my general question: Is a Vitodens 200-W actually sufficient?
Thank you very much.
I must mention beforehand that I am a novice on this topic and do not have a lot of information. I understand that the lack of details may limit your input. Nevertheless, I would be very grateful if you could share your opinion based on the available information.
Thank you in advance for your support.
The issue concerns a single-family house where underfloor heating was recently installed from the basement to the attic (i.e., basement, ground floor, first floor, attic). Previously, there were radiators, which have now been removed. The area is approximately 125 m² (1350 sq ft).
In the basement, there is a Viessmann Vitodens 200-W boiler. There is also a Viessmann hot water storage tank (if this is relevant). Each room has an individual analog room thermostat.
The current problem is as follows: The rooms only become lukewarm, even though the thermostats are set to at least 23°C (73°F). When the outside temperature is just above 0°C (32°F) in the morning, the rooms show about 19°C (66°F) according to the weather station.
Various settings have been adjusted on the Vitodens 200-W so far without success. Examples:
- Set room temperature adjusted to 23°C (73°F) to 25°C (77°F)
- Slope increased up to 1
- Level increased up to 3
Additionally, a Yonos PICO plus 25/1-4 circulation pump was installed. The displayed flow rate varies depending on how many rooms are being heated. With only a few rooms (1–2) heated, the flow rate shows between 0 and 0.2 m³/h. I do not know whether this is a good or bad value.
Now the discussions have started:
- “A hydraulic balancing must be carried out”
- “A pump group must be installed”
- “A new gas boiler must be installed”
All very costly in today’s times. Due to poor experiences with some heating technicians and the various opinions about what is actually necessary, I find it very difficult to decide on a direction.
Therefore, I would be very grateful if you could simply share your opinion or gut feeling based on this information.
It seems to me that too much heat is lost before it even reaches the rooms. Hence my general question: Is a Vitodens 200-W actually sufficient?
Thank you very much.
KoalasAreCute27 Mar 2023 17:16Thomas38 schrieb:
It doesn't even show 5 m³/h (cubic meters per hour).Please be careful, 1 m³ of water equals 1000 liters (L). The two-digit values I mentioned were in L/minute (liters per minute).S
stjoob_at29 Mar 2023 10:54The flow temperature is certainly high enough, even on the higher side for underfloor heating. In new constructions, temperatures below 30°C (86°F) are often used even in freezing conditions...
Another possibility is that there is air in the system. In that case, you cannot transfer heat effectively or the output is reduced.
Another possibility is that there is air in the system. In that case, you cannot transfer heat effectively or the output is reduced.
Oh dear, when I already read about individual room control here, it makes my hair stand on end.
And then a supply temperature of 47°C (117°F) at 0°C (32°F) outside temperature? Totally off.
The difference between 7°C (45°F) and 10°C (50°F) outside temperature can also be explained by the heat radiation from the exterior wall.
Was a hydraulic balancing mentioned at least?
And then a supply temperature of 47°C (117°F) at 0°C (32°F) outside temperature? Totally off.
The difference between 7°C (45°F) and 10°C (50°F) outside temperature can also be explained by the heat radiation from the exterior wall.
Was a hydraulic balancing mentioned at least?
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