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Source: Gerhardy (DVGW, Bonn)
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) From the point of secure temperature containment to the point of extraction
Advantages of the system
1.
No Drinking Water Ordinance as under 400 l and under 3 l pipe volume
2.
No annual sample collection
3.
Significantly lower installation costs as only two-wire system and one KW supply per residential unit
4.
No circulation, no hot water line
5.
Significantly lower inlet temperatures
6.
Lower operating costs
7.
Circulating water of the strands from the source buffer tank = 20 °C (corresponds to the room/ambient
temperature) - Further use of existing (possibly poorly insulated) pipelines possible
8.
Higher efficiency of the heat pump
9.
Less load on the heat pump
10.
Lower noise emission of the heat pump
11.
Each tenant can set their desired temperature
12.
Continuous hot water supply even when the heat pump is not in operation, e.g. power supply company
shutdown, malfunction, etc.
13.
The power supply of the MWL is connected in the electrical distribution of the residential unit
14.
No billing problems with the tenants
Conclusion:
Since it is difficult to reconcile the requirements of the Drinking Water Ordinance and the possibilities of a
heat pump system, specialist tradesmen/planners as well as manufacturers are forced to create systems that
meet the technical requirements and at the same time keep the investment costs within reasonable limits.
When using this system, the central hot water preparation and the resulting short pipe routes to the taps
mean that the Drinking Water Ordinance is fulfilled with regard to the 3L rule.
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