Do dual showerheads reduce water pressure when both heads run at once?

Many dual-head combos route water through a diverter so you typically run the fixed head or the handheld, not both at full strength simultaneously. Verified-purchase reviewers across these listings generally report adequate pressure in single-head mode; running both at once usually splits flow. If strong simultaneous pressure matters, look for models explicitly marketed as high-pressure and check your home's existing water pressure first.