I just had a new german-pools 6000w under-sink water heater installed. My place is fairly new, and it had the switch on the wall, and the plumbing/wiring under the sink ready with dedicated wiring (in three phase, though). I just added the heater to complete it. However, it's not working at correct capacity (ie, the temp per flow rate is low - really low).
I thought I had single-phase power in the house, but I don't - I have 3-phase. And apparently this unit is designed for single phase (and I bought it on that premise). The electrician who came out said no problem, and made a few wiring changes, either in the breaker box, or under the sink. Not sure exactly how he hooked it up. But I do know you can wire single phase appliances into three phase - that's how whole houses connect to the grid in many parts of the world - single phase is run from the pole into the house. but here in HK, at least in some places, 3 phase comes right into the breaker box, and runs around the house, for big things that need it, like water heaters.
My question - is it possible he hooked up the heater wrong? his explanation for why it's not very warm is because of the wattage (6kw)combined with the phase switch-ery he had to perform. My friend's mom just had a similar unit installed - and it runs reallly hot.
My technical knowledge is limited, but I think there is a phase balance problem or something like his hook up is faulty....
Any recommendations? Like a good *HONEST* English speaking electrician that won't charge a fortune just to talk to me and see if something can be done?