ᐅ Sizing of Domestic Hot Water Storage for District Heating Systems?

How large should our hot water storage tank be?

- District heating
- House 180 m2 (1,937 sq ft) with underfloor heating
- New build according to energy saving regulations
- 4 people
- 2 standard showers
- and 1 standard-sized bathtub in the house

Our installer suggests 190 liters (50 gallons), while our district heating provider considers 300 liters (79 gallons) more appropriate.

What do you think?

It depends on the temperature at which the water is stored in the tank.

kkk272729 schrieb:
It depends on how warm the water is kept in the storage tank.

As warm as necessary to prevent bacterial contamination.

But at the same time, as cool as possible to save energy.

Whatever the optimal temperature is here... 55°C (131°F)...?

What is the output capacity of the district heating station?
I would tend to downsize. The 190 liters (50 gallons) heat up to bathing temperature very quickly. With normal use, it won't run out.

Alex85 schrieb:
What is the output capacity of the district heating station? I would tend to downsize. The 190 liters (50 gallons) heat up to bathing temperature very quickly. With normal use, there’s no way it runs out.

The house connection capacity of the district heating system is 14 kW.

Is 190 liters (50 gallons) sufficient then? What do you think makes sense here?

Christian NW schrieb:
Our installer recommends 190 liters (50 gallons), while our district heating provider considers 300 liters (79 gallons) more appropriate.

Can they each explain their reasons?