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For those who want to measure water flow this new flow meter can be interesting:
http://www.adafruit.com/products/833
Don't expect it to be very accurate, but it could be useful to detect DHW usage and enable you to calculate gas usage consumed by taking a shower, for instance.
It does require a MCU to count the pulses BTW.

To bad.. Only up to 17.5 Bar
I would love to use it for my snowgun(s).
For the air pressure it would be okay, but for the water it needs tobe 30 bar.