We have a 300L (79 gallons) buffer tank, and our heating is supplied by district heating. Currently, the heating boost is set to run from 5:30 a.m. to 10 p.m. I have read that it is better to start the heating boost from around midday to optimize the efficiency of the solar thermal system, since the water is colder and can absorb energy more effectively. That sounds reasonable to me.
My question is: How much can I reduce the district heating boost time for domestic hot water production? At the same time, I want to ensure that Legionella prevention is adequately addressed. Currently, my domestic hot water temperature is set to 65°C (149°F). Would it theoretically be sufficient to run the heating boost for about 1 hour per day to raise the tank temperature to 65°C (149°F) and thus prevent Legionella?
What would be the most efficient approach regarding the solar thermal system in this context?
My question is: How much can I reduce the district heating boost time for domestic hot water production? At the same time, I want to ensure that Legionella prevention is adequately addressed. Currently, my domestic hot water temperature is set to 65°C (149°F). Would it theoretically be sufficient to run the heating boost for about 1 hour per day to raise the tank temperature to 65°C (149°F) and thus prevent Legionella?
What would be the most efficient approach regarding the solar thermal system in this context?
That's correct, such a control system does not exist yet, but I know from reliable sources that heating engineers are, of course, working on making these systems truly smart, which will result in significant efficiency improvements. However, this will take some time, so for now, the only option is for residents to contribute the smart component themselves.
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BenutzerPC9 May 2021 18:24To revisit the topic: What do you recommend regarding the activation or switching on of the auxiliary heat source (FW) for domestic hot water production? I was thinking of turning on the FW for hot water heating starting in May (good sunlight, summer is coming...) but only from late afternoon, perhaps 3 p.m. to 9 p.m. This would ensure that
a) There is still enough hot water available in the morning for basic hygiene.
b) No additional heating of the water takes place in the morning, so that the water remains as "cool" as possible to allow the solar thermal (ST) system to absorb the maximum heat.
As I understand it: If the target temperature in the buffer tank is already reached by midday, the FW should not switch on for hot water preparation. There should be a control system that monitors the actual temperature of the hot water in the tank and, if necessary, heats the water to the setpoint temperature. If this temperature is already met, then no heating should be required, correct?
I think the main concern is that if the tank is empty in the evening or if incoming fresh, cold water lowers the mixed temperature, and because it is evening (no more heating from the ST system), the FW ensures that the water is heated.
a) There is still enough hot water available in the morning for basic hygiene.
b) No additional heating of the water takes place in the morning, so that the water remains as "cool" as possible to allow the solar thermal (ST) system to absorb the maximum heat.
As I understand it: If the target temperature in the buffer tank is already reached by midday, the FW should not switch on for hot water preparation. There should be a control system that monitors the actual temperature of the hot water in the tank and, if necessary, heats the water to the setpoint temperature. If this temperature is already met, then no heating should be required, correct?
I think the main concern is that if the tank is empty in the evening or if incoming fresh, cold water lowers the mixed temperature, and because it is evening (no more heating from the ST system), the FW ensures that the water is heated.
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