For showers in a new Project a shower column kit will be installed and it includes: a showerhead, a hose and a faucet.

(Example: Kohler Singulier K-72672T-C4-CP)

Each of the kit features has a different water consumption.

Should we:

a) Only verify the consumption for the showerhead? or

b) Verify the water consumption for each feature? (what to do with the hose?) or

c) Do the calculation with an average from the 3?