Selection of an adequate DHW system depends of your requirements to:
Efficiency: Taking into account not only the initial investment amount but also the long-term operating costs
Hygienic requirements: An issue that is particularly critical for systems used around aging individuals or senior citizens
Comfort needs: In public housing projects, the expectations are obviously different from those at 4-star luxury hotels
The existing heating medium and the effectively available capacity
Space requirements of the domestic water heating system: Large storage capacities call for rooms that are equivalent in size