HabneFrage
2020-11-24 18:15:30
- #1
Good day. I came across this forum to get advice about my domestic hot water system. I hope I am in the correct category (Heating or Sanitary?). Problem: My domestic water system (domestic water) causes temperature fluctuations (especially when showering). The temperature sometimes fluctuates by about 5 degrees from the setting (single-lever mixer). So there is a slight drop in temperature, which requires readjustment (frequently). Of course, that is annoying. No consistent temperature. PS: Thermostatic cartridges are not installed! I need to find out the cause of the fluctuations (even if thermostats would solve this). Multi-family house with 5 units, 4 years old. Problem has existed since construction. Sometimes more, sometimes less pronounced. Flow rate 50 l/min supplied by a 1000L buffer tank (50% reserved for domestic water. So a large amount!) Buffer is charged from above at 70 degrees. Buffer temperatures thus about 70 degrees at the top to about 60 degrees in the middle of the tank. Temperature limiter 65 degrees for domestic water. Domestic water draws supply from the buffer connection at the top! So the hottest spot. Therefore, manual temperature limiter set to 65 degrees. Domestic water target temperature 57 degrees, supply 65-68 degrees (partially more than 65 degrees passes through the limiter) Circulation 52 degrees Temperature production from domestic water initially about 60-62 degrees dropping to about 55 degrees (at full load). Temperature at consumer points in apartments about 55 to 57 degrees. Supplier: 5 units (not all showering or bathing at the same time! Well distributed) Please do not write "run your domestic water at 50 degrees etc." 57-60 degrees production is desired and should be maintained. Even if this increases lime deposits (water hardness approx. 10 °dH). The question is, why does the domestic water with the above data produce fluctuating temperatures, which is annoying when showering. In summer - with solar support - this problem is not as pronounced. Maybe someone knows this problem with a domestic water station. Many thanks for the help!