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.
rick2018 schrieb:
This is not a heat pump. It is also reasonable to use individual room control in this case...
Depending on the size of the house, the supply air temperature will also need to be higher.
The problem here is probably related to the flow rate.I rarely read such nonsense. Except for the comment about the flow rate.
The gas heating can still operate efficiently. It is not a heat pump. The energy required to raise the temperature by, for example, 10 degrees is almost always the same. With a heat pump, it makes a difference whether you go from 20°C (68°F) to 30°C (86°F) or from 50°C (122°F) to 60°C (140°F).
And in large houses, higher flow temperatures are needed due to the distances involved. But probably our idea of large differs..
And in large houses, higher flow temperatures are needed due to the distances involved. But probably our idea of large differs..
W
WilderSueden30 Mar 2023 19:52I think jojo just doesn't know your house 😉
rick2018 schrieb:
And for large houses, due to the distances involved, higher supply temperatures are required. But our idea of large is probably different..Our house is also 125m2 (1,345 sq ft) and it doesn’t need to be heated with 47°C (117°F) at 0°C (32°F) outside temperature.However, the OP does not mention any details about the house. Detached, terraced, year of construction, insulation, etc.
jojo6262 schrieb:
Our house is also 125m² (1345 sq ft) and it doesn’t have to be blasted at 47°C (117°F) when it’s 0°C (32°F) outside.
However, the original poster doesn’t mention any details about the house. Detached, terraced, year built, insulation, etc. As far as I remember, Rick’s house is slightly larger than 125m² (1345 sq ft). 😀
I fully agree with @rick2018 here; the flow rate is obviously too low, but this is probably not due to incorrect settings on the heating circuit valve (which can of course make things worse), but rather because of insufficient capacity of the pump installed in the Vitodens. It simply cannot effectively push water through all the loops, so the rooms stay lukewarm because the energy is not being delivered properly.
Similar topics