Had the Sanden Eco Plus from Pure Electric for about four months now, really happy with unit. I am really quite surprised with just how quiet it is, I'd say less than the whirring of an overhead ceilingfan on low speed. Power consumption is about 900w and it normally runs for about 1.5-2.5 hours per day. I do have one minor issues with it, which is the size but being 300L and having the heat pump unit adjacent I understand not much can be done about that (Upon enquiry they told me that it requires the big evaporator / radiator coils and big fan to be so whisper quiet and highly efficient). The other issue is to get to the timer / clock I have to take 4 screws off. I've basically left one screw in for this reason and the other 1 out. The back left one is in as it seems to be required structurally to keep the thing together. Anyway overall I'm super impressed as it's just slashed our heating of hot water. Just the gas cooktop to go now and we will go for Miele or Neff for that one. Approximate cost: $4400