Mixer Showers are taking the showering industry by storm with unique designs and ingenious, user-friendly features. They work but taking water from your hot and cold feeds and combining the inside the mixing valve to the optimum temperature. Mixer showers are usually available in one of three choices, Exposed Valve or Variable (EV), Built-In Rigid (BIR) and Built-In Valve or Variable (BIV). Exposed valve mixer showers are mounted inside the showering area with pipes that connect through the wall, built-in rigid mixer showers are installed inside the wall with just the shower control and the rigid shower head visible, and lastly the built-in valve mixer shower has the valve installed in the wall but with an adjustable riser rail fitted in the shower area. You’ll often see BIR and BIV mixer showers described as “concealed” like below.