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dancing james
If you're going for a double boiler I always think a rotary pump is nice to have too, nice and quiet. The Rocket R58 ticks all the boxes, it's compact too. The taps feel a bit plasticky though. Profitec 700 feels better quality, does all the same stuff.
Orchestrale Nota is my favourite of all the machines BB do. Heat exchanger, rotary pump, massive boiler, very sturdy. The boiler size is the crucial thing, it's super temp stable.
Domestic dual boilers cram so much stuff into a very small space, it's a highly compromised design. The 2 boilers are tiny, it's like cooking with a flimsy lightweight saucepan vs a big iron pot. They're very complicated and they go wrong a lot. I don't believe that a dual boiler really gives you any more temperature predictability than a HX machine with an experienced operator.