ᐅ Which Heating System for Maintaining a Room Temperature of 23 °C
Created on: 14 Sep 2020 13:46
F
Fetzerino
Hello community,
For the past few days, I have been researching current heating technologies and feel that it raises more questions than answers, which is why I am now turning to you with my questions in the hope that experienced users of this system can provide some answers.
My wife and I would like to build a KFW40+ house with about 130 sqm (1400 sq ft). The house will have an unobstructed southern exposure, meaning plenty of sun in both summer and winter. A photovoltaic system will be installed on the roof. At the moment, we are leaning towards a prefabricated house, but we are still in the decision-making phase.
We both currently live in an apartment with underfloor heating and a gas boiler, and we find the warmth emitted by the underfloor heating very comfortable. I have set the central room temperature to 23°C (73°F) on the gas boiler because we both like it quite warm, although this can be adjusted downward locally with thermostats.
With a prefabricated house, the Proxon air-to-air heat pump is usually offered as the solution on the market. However, further research reveals advantages and disadvantages of this technology, as with any topic. I have read so far that many heat their rooms to 20–21°C (68–70°F) using the air-to-air heat pump. However, I have not yet found out whether it is possible to reach 23°C (73°F) with an air-to-air heat pump without the use of auxiliary heating panels. The question is also what power consumption these auxiliary panels have. The sales representative of the prefab house provider mentioned that with these auxiliary heating panels, the room can be warmed quite quickly (within 5 minutes). Ultimately, the whole setup works like a hairdryer. But if I hold a 2 kW hairdryer in a room, I don’t notice a significant difference after 5 minutes.
Question: Can I achieve a room temperature of 23°C (73°F) without auxiliary heating panels, even in larger rooms? What is the power consumption of such an auxiliary heating panel? Does anyone have additional consumption data for this heating solution? How does it perform on cold winter days? Ultimately, it is about the indoor climate, and 23°C (73°F) is not always the same 23°C (73°F), which I understand.
As an alternative, it seems that an air-to-water heat pump is also an option. In terms of efficiency, this is said to be similar to the air-to-air heat pump but more expensive to install because pipes must be laid. However, since the flow temperature is lower, it should be more economical to operate. Is that correct? With this type of heating, there should be no problem achieving 23°C (73°F) even in larger rooms, right? Does anyone also have consumption data here? Of course, it depends on individual behavior, which I understand, but figures can help build a sense for it.
Cooling in summer is not possible with this heating system but should be possible as an add-on with an air-to-air heat pump. Does a KFW40+ house get very warm in summer?
Thank you very much for your help and information.
For the past few days, I have been researching current heating technologies and feel that it raises more questions than answers, which is why I am now turning to you with my questions in the hope that experienced users of this system can provide some answers.
My wife and I would like to build a KFW40+ house with about 130 sqm (1400 sq ft). The house will have an unobstructed southern exposure, meaning plenty of sun in both summer and winter. A photovoltaic system will be installed on the roof. At the moment, we are leaning towards a prefabricated house, but we are still in the decision-making phase.
We both currently live in an apartment with underfloor heating and a gas boiler, and we find the warmth emitted by the underfloor heating very comfortable. I have set the central room temperature to 23°C (73°F) on the gas boiler because we both like it quite warm, although this can be adjusted downward locally with thermostats.
With a prefabricated house, the Proxon air-to-air heat pump is usually offered as the solution on the market. However, further research reveals advantages and disadvantages of this technology, as with any topic. I have read so far that many heat their rooms to 20–21°C (68–70°F) using the air-to-air heat pump. However, I have not yet found out whether it is possible to reach 23°C (73°F) with an air-to-air heat pump without the use of auxiliary heating panels. The question is also what power consumption these auxiliary panels have. The sales representative of the prefab house provider mentioned that with these auxiliary heating panels, the room can be warmed quite quickly (within 5 minutes). Ultimately, the whole setup works like a hairdryer. But if I hold a 2 kW hairdryer in a room, I don’t notice a significant difference after 5 minutes.
Question: Can I achieve a room temperature of 23°C (73°F) without auxiliary heating panels, even in larger rooms? What is the power consumption of such an auxiliary heating panel? Does anyone have additional consumption data for this heating solution? How does it perform on cold winter days? Ultimately, it is about the indoor climate, and 23°C (73°F) is not always the same 23°C (73°F), which I understand.
As an alternative, it seems that an air-to-water heat pump is also an option. In terms of efficiency, this is said to be similar to the air-to-air heat pump but more expensive to install because pipes must be laid. However, since the flow temperature is lower, it should be more economical to operate. Is that correct? With this type of heating, there should be no problem achieving 23°C (73°F) even in larger rooms, right? Does anyone also have consumption data here? Of course, it depends on individual behavior, which I understand, but figures can help build a sense for it.
Cooling in summer is not possible with this heating system but should be possible as an add-on with an air-to-air heat pump. Does a KFW40+ house get very warm in summer?
Thank you very much for your help and information.
According to common forum discussions, a well-adjusted heat pump requires about 2 to 3 kWh for domestic hot water per day. Over the course of a year, this amounts to roughly 1,000 kWh. Heating typically uses about 1,500 to 2,000 kWh. In total, the best-case scenario is around 2,500 kWh. At a minimum electricity price of 21 cents per kWh, that results in a total cost of 40 to 45 euros. However, this is all in the ideal range. I would say 95% of installed heat pumps will never achieve these numbers.
D
Daniel-Sp15 Sep 2020 12:46Bookstar schrieb:
According to common forums, a well-adjusted heat pump requires about 2 to 3 kWh for domestic hot water per day. Over the year, that’s around 1000 kWh. Heating consumes about 1500 to 2000 kWh. In total, best case 2500 kWh. At a minimum electricity cost of 21 cents per kWh, your total is around 40 to 45 euros. However, these are all ideal figures. I’d say 95% of installed heat pumps will never reach these values.Hmm, I need between 0.8 and 1.1 kWh for domestic hot water in summer.Daniel-Sp schrieb:
Hmm, I need between 0.8 and 1.1 kWh for hot water during the summer That’s quite impressive. Either you use very little hot water, or you’re breaking the physical limits somehow. I don’t believe that your heat pump produces more than 4 kWh from 1 kWh of electricity if it’s an air-to-water heat pump. We need about 200 liters (53 gallons) of hot water daily for two people, and some of it cools down unused. That equals 12 kWh; with a COP of 4, that’s 3 kWh effective energy use. So, you would have to manage with 70 liters (18 gallons) of hot water, and the storage would have no losses. Please explain that to me—no one could even take a warm shower with that amount...
D
Daniel-Sp15 Sep 2020 16:03I’m only reporting what my electricity meter shows, sorry
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