On the whole, yes, sometimes it's in a flow sensing manifold on the primary side, which might be incorporated in the diverter valve manifold but may be on a pump manifold.
There's also two in some toilet cisterns, one in others and some have non whatsoever.
hes got another thread running about his 24cdi.......so yes bdog it is part of the diverter......depending on how good or bad an engineer he is he may spit his dummy out when you mention the boiler model.
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