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I am an Australian and a Home Automation System Integrator and I can tell you legally you can't engage in any electrical or plumbing works without a licensce. Also you may also void your Insurance Policy if you make a claim and the water system was the direct cause of the problem (i.e. Fire or Leakage).

As RedGrittyBrick mentioned it may not be safe. It is not legal in Australia as it is only certified by Chinese standards and the installation of said unit is against the law ( not really a problem for you unless someone else uses it and gets electrocuted, you sell it, or sell the dwelling you are connecting it to. For reference perhaps look up "solar and ...

It may not be safe. My hot water tank has a 3 kW electric immersion heater. So the electric wiring to this would not be suitable for a 6 kW electric shower. However my immersion heater is only a secondary system used if my gas-fired boiler is not working for any reason. So your water heater may be rated higher if it is the primary water heater. You can ...