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Dafi's own literature shows one of their heaters connected to a shower: http://www.dafi-water-heater.com/en/content/14-manual

@flameport - well I'm grateful to you and everyone else who has put a view forward - it's been really, really helpful. I'm sure I can't be the only person who has to think through these issues. Maybe some of the wider points raised will help others, too. If it's a total fail with the Dafi...

Installing a small 3-phase DB like the Nano with RCD (much as I hate to buy Chinese products) isn't going to cost much and it's there if we decide to put a couple of extra 11kW Dafi heaters in and share them between fewer outlets. But until we try it and find out what this unit can produce, we...

I think I have figured this out now so will run it past the contractor who will sign it off. We'll put a new 3-phase DB in after the incoming switch. Thanks Simon35 for flagging up the issue about the YY cable. We've lots of SY in our industrial premises, although mainly used for machine...

Thanks for the helpful and constructive replies. Re. the HR17B - those were my initial thoughts, flameport, but as they are being sold in the UK it made me wonder whether they had a legitimate / permitted cable protection role. Rotary isolater was the obvious choice - thanks chivers67 - but...

I have a three storey building with 3-phase supply, which is split so there is a single phase on each floor. There are no 3-phase DBs in the building, only single phase (one on each floor). I've recently bought an 11kW 400V Dafi to see how it performs as a hot water heater. It requires two...