ᐅ Heat pumps consume a significant amount of energy and can generate considerable noise.
Created on: 17 Jan 2024 18:26
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Eldirwars
Hello everyone,
We have been living in our new house for one month now and are experiencing significant noise issues. The noise comes from the manifold of the underfloor heating system as well as the pump itself, which is very loud. The sounds are mostly sharp clicking or ticking noises, especially noticeable in the bedroom. The flow rate and the pump settings have been adjusted, but nothing has improved. However, it is always quiet in the early morning hours. Could it possibly be due to a setting on the unit? The heating technician has already been here but is unsure of the cause. Another technician from Bosch is scheduled to come and take a look, but I’m not sure if the pump is the problem. Also, the house is barely warming up at the current temperatures, and I am using more than 30 kWh daily, which seems very high for a 150 m² (1,615 sq ft) home.
We have been living in our new house for one month now and are experiencing significant noise issues. The noise comes from the manifold of the underfloor heating system as well as the pump itself, which is very loud. The sounds are mostly sharp clicking or ticking noises, especially noticeable in the bedroom. The flow rate and the pump settings have been adjusted, but nothing has improved. However, it is always quiet in the early morning hours. Could it possibly be due to a setting on the unit? The heating technician has already been here but is unsure of the cause. Another technician from Bosch is scheduled to come and take a look, but I’m not sure if the pump is the problem. Also, the house is barely warming up at the current temperatures, and I am using more than 30 kWh daily, which seems very high for a 150 m² (1,615 sq ft) home.
J
jens.knoedel18 Jan 2024 16:18Eldirwars schrieb:
There must be a certain value where the heating system says, okay, I’ve reached the target and can turn off for a while. Otherwise, does it just run continuously? Exactly. In winter, the heat pump runs 24/7 (as it does currently). And that’s actually how it should be.
It is controlled “only” by the set supply and return temperatures. For me, they are currently 30°C/25°C (86°F/77°F) for an indoor temperature of 21°C (70°F) with the current subzero outside temperatures. When it gets warmer outside, the heat pump lowers the temperatures based on the preset heating curve (around +5°C, maybe down to 28°C/23°C (82°F/73°F)). When it gets colder, it adjusts the other way around. The indoor temperature always stays approximately the same.
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Eldirwars18 Jan 2024 16:26WilderSueden schrieb:
On the one hand, continuous operation at a steady performance level is desirable for a heat pump. However, the heat pump switches off when the water returns too warm because the heating circuits no longer take up any heat. The entire system is designed so that the energy supplied by the heater matches the energy lost through the external walls, and with open valves, the temperature is balanced. Okay, and how does it work in summer then? Should you keep the pump running anyway, or does it switch off automatically at a certain outdoor temperature? Do you only adjust the temperature using the heating curve? I always thought that if the pump runs continuously, it consumes electricity continuously as well.
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Eldirwars18 Jan 2024 16:28jens.knoedel schrieb:
That’s right. In winter, the heat pump runs 24/7 (as it does currently). And that’s actually a good thing.
It’s controlled “only” through the set supply and return temperatures. For me, it’s currently 30/25°C (86/77°F) for an indoor temperature of 21°C (70°F) and the current subzero temperatures outside. When it gets warmer outside, the heat pump lowers the temperatures according to the heating curve (maybe +5 degrees to 28/23°C (82/73°F)). If it gets colder, the opposite happens. The room temperatures remain approximately the same. Okay, and how do you control the individual rooms? Or do you have 21°C (70°F) everywhere in the house?
J
jens.knoedel18 Jan 2024 16:29Eldirwars schrieb:
Okay, and how does it work in summer then? Should you still keep the pump running, or does it switch off automatically at a certain outdoor temperature?You set the temperature at which it switches from heating mode to summer mode (hot water only). Depending on the manufacturer, different methods are used to determine this, such as averaging the last 24 hours’ temperature plus the current temperature, or other calculations.J
jens.knoedel18 Jan 2024 16:32Eldirwars schrieb:
Okay, so how do you control the individual rooms? Or do you have 21 degrees everywhere in the house?Not at all. I don’t have any room thermostats either. I had the heating system designed according to my preferences. Temperatures between 20-22 degrees Celsius (68-72°F) were planned. However, to maintain that, I would need to keep the doors closed throughout the house, which I don’t like. So everything is set to the same temperature, and the variation is about plus or minus 1 degree everywhere.
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WilderSueden18 Jan 2024 16:46Eldirwars schrieb:
Okay, and how does it work in summer? Should you keep the pump running, or does it turn off automatically at a certain outdoor temperature? Do you then only adjust the temperature using the heating curve? I always thought that if the pump runs continuously, it uses electricity continuously as well.The amount of electricity used mainly depends on the amount of heat needed, which in turn is determined by how much heat you lose through the walls. Whether the heat pump runs for one hour at 1 kW and then rests for an hour, or runs for two hours at 0.5 kW, it doesn’t make much difference. Compressors dislike frequent starting and stopping, so it’s best for the heat pump to run continuously to minimize wear and tear.The heating technician likely set a temperature threshold at which the heat pump automatically switches off the heating. However, you can also turn it off manually. I do this because, thanks to our large window areas, we quickly reach a point in spring where the heating demand drops below what the heat pump requires to operate smoothly, causing short cycling—even though the outdoor temperature is not yet very warm.
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