Shower mixers
The Illustrated Guide to Hot and Cold Water Services (BG 33/2014), written by Reginald Brown and published by BSRIA in 2014, it states: ‘Shower mixers work off system pressure and incorporate a manually operated valve to switch between the tap outlet and shower head. Shower mixers may be combined with an under-bath pump to increase delivery pressure. Where thermostatic mixing valves (TMVs) are used, the shower pump should be fitted before the TMV. Double ended shower pumps pressurise both the hot and cold water.’
--BSRIA
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