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Compare the shower with nearby fixtures, measure its flow, then test a handheld shower with the head removed from the hose. Strong hose flow but weak head flow means the restriction is in the head. Weak hose flow sends the investigation upstream to the hose, outlet, mixing valve, hot-water system or building supply. A high-pressure shower head can reshape the spray; it cannot create supply pressure that is not there.

An eight-minute shower uses 16 gallons at 2.0 gpm or 20 gallons at 2.5 gpm. In metric units, that is about 60.6 or 75.7 liters. Use the calculator below with your measured flow—not a generic average—for a result that applies to your bathroom.

Most modern shower heads are standardized enough to replace, but they are not universal in every situation. Confirm the connection standard, where the joint seals, hose and holder geometry, available clearance and destination-market requirements before buying.