Hello everyone.
As a first-time homebuyer, I have many questions. One that has been on my mind lately is this:
We have a KfW70 house with good insulation (16cm (6 inches) masonry and 18cm (7 inches) insulation), and underfloor heating powered by a ground source heat pump.
When I drop my little one off at kindergarten in the morning, I am always surprised that the tiles in the kindergarten’s entrance area feel noticeably warm.
Our tiles, for example in the living room, on the other hand, feel noticeably cold. The thermostat in the living room is set to 20°C (68°F), and it maintains that temperature well, which is good. But why do the tiles feel cold to the touch?
Is it because the kindergarten is not heated with geothermal energy and, on the other hand, is not insulated like our house?
Of course, the underfloor heating is meant to maintain the room temperature (which it does) and not to warm your feet. But what explains the "noticeably cold tiles" anyway? Our heating system obviously doesn’t have to work as hard because of the good insulation.
An explanation would definitely help me feel more at ease.
As a first-time homebuyer, I have many questions. One that has been on my mind lately is this:
We have a KfW70 house with good insulation (16cm (6 inches) masonry and 18cm (7 inches) insulation), and underfloor heating powered by a ground source heat pump.
When I drop my little one off at kindergarten in the morning, I am always surprised that the tiles in the kindergarten’s entrance area feel noticeably warm.
Our tiles, for example in the living room, on the other hand, feel noticeably cold. The thermostat in the living room is set to 20°C (68°F), and it maintains that temperature well, which is good. But why do the tiles feel cold to the touch?
Is it because the kindergarten is not heated with geothermal energy and, on the other hand, is not insulated like our house?
Of course, the underfloor heating is meant to maintain the room temperature (which it does) and not to warm your feet. But what explains the "noticeably cold tiles" anyway? Our heating system obviously doesn’t have to work as hard because of the good insulation.
An explanation would definitely help me feel more at ease.
C
crazy517020 Nov 2014 06:26I don’t want to bother you every day, but this can’t be right!
This morning, the living room temperature is 18.4°C (65.1°F)!
System settings at an outside temperature of 8°C (46.4°F):
Circuit 1
Heating curve 21.9/36.3
T1 flow temperature 24.6°C (76.3°F)
T1 target flow temperature 26.9°C (80.4°F)
Room temperature 35.0°C (95.0°F)
Heat pump 1
T6 heating gas 23.1°C (73.6°F)
T8 heat transfer fluid out 24.7°C (76.5°F)
T9 heat transfer fluid in 24.7°C (76.5°F)
T10 ground loop in 15.4°C (59.7°F)
T11 ground loop out 15.7°C (60.3°F)
The room thermostats in the living room and bathroom are set to maximum.
Since I don’t (yet) fully understand all the values, I’m wondering why the system is not heating when the outside temperature is 8°C (46.4°F). Why isn’t it heating when the target flow temperature is 26.9°C (80.4°F), but the actual flow temperature is only 24.6°C (76.3°F)?
This morning, the living room temperature is 18.4°C (65.1°F)!
System settings at an outside temperature of 8°C (46.4°F):
Circuit 1
Heating curve 21.9/36.3
T1 flow temperature 24.6°C (76.3°F)
T1 target flow temperature 26.9°C (80.4°F)
Room temperature 35.0°C (95.0°F)
Heat pump 1
T6 heating gas 23.1°C (73.6°F)
T8 heat transfer fluid out 24.7°C (76.5°F)
T9 heat transfer fluid in 24.7°C (76.5°F)
T10 ground loop in 15.4°C (59.7°F)
T11 ground loop out 15.7°C (60.3°F)
The room thermostats in the living room and bathroom are set to maximum.
Since I don’t (yet) fully understand all the values, I’m wondering why the system is not heating when the outside temperature is 8°C (46.4°F). Why isn’t it heating when the target flow temperature is 26.9°C (80.4°F), but the actual flow temperature is only 24.6°C (76.3°F)?
Does your heating run all day, or do you have specific heating times set? In our case, the heating runs at night, with shower times scheduled in the morning before we leave the house. It starts heating again in the afternoon and then there are shower times in the evening.
Domestic hot water is always given priority, so check your settings for hot water production times.
Also, I find it surprising that you have a flow temperature set to 26°C (79°F) and a room temperature set to 35°C (95°F). With 26°C (79°F), it’s unlikely you can ever reach 35°C (95°F) in the room.
Domestic hot water is always given priority, so check your settings for hot water production times.
Also, I find it surprising that you have a flow temperature set to 26°C (79°F) and a room temperature set to 35°C (95°F). With 26°C (79°F), it’s unlikely you can ever reach 35°C (95°F) in the room.
D
DerBjoern20 Nov 2014 08:47Perhaps you have a night setback programmed? Unfortunately, this is often set by default but doesn’t really make sense in a new build with a heat pump.
C
crazy517020 Nov 2014 09:15No night setback or intermittent shutoff during the day. I’m already surprised because the curve shows that the flow temperature should be 26°C (79°F) at an outside temperature of 10°C (50°F). In that case, the living room with the thermostat turned up should be warmer than 18°C (64°F), right? Why is the actual flow temperature lower than the target flow temperature? Am I misunderstanding something here?
C
crazy517020 Nov 2014 09:21To Musketier:
Even if I were to lower the recommended room temperature, nothing will get warmer here. The mentioned 26°C (79°F) is not even reached.
How do your settings compare? I don’t want to leave any option untried.
Even if I were to lower the recommended room temperature, nothing will get warmer here. The mentioned 26°C (79°F) is not even reached.
How do your settings compare? I don’t want to leave any option untried.
What does the hot water preparation do?
Your message was from early this morning. Maybe you took a shower before, so the temperature needed to be reheated first?
Is the thermometer working correctly? I have also experienced placing several next to each other showing different temperatures.
We have different settings on our heat pump compared to yours, and I still need to get familiar with them, although the settings are currently working quite well.
Your message was from early this morning. Maybe you took a shower before, so the temperature needed to be reheated first?
Is the thermometer working correctly? I have also experienced placing several next to each other showing different temperatures.
We have different settings on our heat pump compared to yours, and I still need to get familiar with them, although the settings are currently working quite well.
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