ᐅ Difference Between Main Water Meter and Apartment Water Meter

Hello,

We have read the meters for 2015. There are 2 residential units, and we handle our own utility cost accounting. There is a municipal water meter located in the utility room. In each of the two apartments, we installed separate meters (hot/cold) from Deltamess. These are located in the bathroom.

In 2014, there was a difference of about 10 cubic meters (cbm) compared to the municipal water meter. At that time, the explanation was that the meters were installed later and water was used by the contractors during the construction phase (which I found acceptable).

Currently, for 2015, there is a new difference of 14 cbm (so a total of 24 cbm over 2 years) compared to the main meter.

Is it possible that the Deltamess meters and the municipal water meter measure differently? The total consumption was 245 cbm in 2015. From what I know about the rental apartment, there were meters in the kitchen; the new house does not have meters in the kitchen. Could it be that this consumption is not being recorded?

Thank you and best wishes for the new year.

Is there a garden irrigation system? If so, where does it branch off from?

Yes, there is one for the ground floor apartment, although the main meter would have to apply there. We have had a hedge since summer that needs watering. We definitely noticed that, so I would rule that out.

There is a city water meter located in the utility room.
Does anything in the utility room (washing machines) use water?

It is generally known that meters measure differently... the larger the Qn value, the less accurate they become...

Quote:

• Oversized meters measure inaccurately – on average, they record about 7% to 10% more than the actual consumption!

No, in the utility room there are buffer tanks and a water softening system. I just remembered that in the guest toilets, where the washing machines are also connected, there are no meters either. Can the difference really be that large? I thought all meters were calibrated.