District heating - domestic hot water via storage tank or instantaneous heater?

  • Erstellt am 2020-09-24 09:45:29

LordNibbler

2020-09-24 17:39:43
  • #1
How are the transfer stations looking so far? Is there one at all, or an old direct connection? So a new one might be necessary. However, there are various concepts for connecting heating and hot water (number of heat exchangers and buffer tanks). It also depends somewhat on what supply temperature will be needed for the heating in the future (normal radiators or underfloor heating).

If you currently have huge devices for water heating in the bathroom, these are probably boilers. They draw little power and keep water warm; after a hot bath is used up, it can take a few hours for the supply to be replenished.

An instantaneous water heater is very compact (more like a shoebox). Since it heats water on the flow, it requires much more power. Because this power is needed quite suddenly, approval from the network operator is generally required for the connection starting from a certain power level.

I personally still have an instantaneous water heater but will switch from district heating with a direct connection to a compact station for central hot water production via district heating. If you choose an instantaneous water heater, be sure to get one with electronic control and not hydraulic. These are very sensitive to pressure fluctuations or do not harmonize with every fitting.

P.S.: this is an 18 kW instantaneous water heater
 

Deraggi2

2020-09-25 12:44:42
  • #2
Thank you very much for your answer. It is an old direct connection, so we will have to procure a transfer station anyway. Then we would also need the hot water storage tank.

I thank you all for the many helpful pieces of information. I think I will discuss this in detail with my specialist company – I just like to have some basic ideas in such situations.

Thanks!
 

LordNibbler

2020-09-25 12:52:04
  • #3
In Wolfsburg, the municipal utilities dictate which models (currently from Pewo) I can use for the compact station. These are also installed by a company designated by them. Only after the installation (which can also include the storage) may any heating engineer work on it, because it is the low-pressure side. On the connection side, only companies certified by them are allowed to work due to high pressure (10bar, 100°C).
 

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