Best way to submetering each tenant unit ?


What is the best way to install supply water "sub metering" for each tenant unit in a mix-used building that has 8 small apartments in it?
The City only has one meter for the entire building.
Each floor has 2 apartments.
Assuming this is to be a new plumbing project.
Choice A.
- run cold water supply pipe to each unit. Then install sub meter for each unit before its entering. Installing Tankless Hot Water for each unit. Then there is a ventilation issue to be resolved.
Choice B:
- Installing a building wide Hot Water tank in basement that supply h.w. to all units. Installing 2 sub- meter for each units, one for H and the other for the Cold.
But then, how to measure the reading ? preferred wireless and auto feed into PC.
Comments or successful case around US ?
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Your basic plumming code can give a very accurate estimate of supply fixture units. You should know this already.

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