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Agile, note that they would not necessarily know about this if I swapped back before the next boiler service. As far as I can see the boiler goes on/off anyway, especially when in comfort mode. Are you suggesting that the other two brands boilers can modulate down to <half (glow worm) of...

Dear (DIYnotters?) Maybe someone knows if the flow sensor can be replaced with one from vaillant or Glow worm Ultracom for their lower switching flow, 1.5l/min and 1l/min, respectively?

gailkm, I don't have any of these installed. Not much information on the net on these instant heaters or multipoint showers as some called them; you would just have to give it a try. I don't see any reason why two in series or parallel should not work.

JohnD: What followed then?

lanman2012: and so what was the decision and did it work?

AWJS01: as you pointed out the power of this heater is not sufficient for your needs, hence I don't see any reason thermostatic mixer would be reducing the hot water flow at any time. Running two in series may not be a good idea, but how about parallel (if half the pressure will actually turn...