What Is a Shower Valve and Why Does It Matter?

A shower valve is the mechanical component that controls the mix of hot and cold water delivered to your shower head, body jets, or bath filler. It regulates both temperature and flow, and in the case of thermostatic valves, maintains your chosen temperature automatically regardless of pressure or temperature fluctuations elsewhere in the household water system. Choosing the right shower valve for your bathroom is one of the most important decisions in any shower installation — it directly affects how your shower performs, how safe it is to use, and how long it will continue to work reliably.

Thermostatic Shower Valves

Thermostatic shower valves are the most popular and widely recommended valve type for UK bathrooms — and for very good reason. A thermostatic valve maintains your preset shower temperature precisely and consistently, automatically compensating for any changes in water pressure or temperature caused by other water being used elsewhere in the house — a toilet flushing, a tap running, or a washing machine filling. Most thermostatic valves also include an anti-scald safety feature that prevents the water temperature from exceeding a safe maximum — making them the safest and most comfortable shower valve option available, particularly for households with young children or elderly users.
Thermostatic shower valves are available in exposed and concealed configurations. Exposed thermostatic valves are surface-mounted on the shower wall with all pipework visible — straightforward to install and service, and available in a wide range of finishes. Concealed thermostatic valves are built into the wall with only the control plate and handles visible on the surface — the cleanest, most minimal aesthetic available and the preferred choice for contemporary bathroom designs where a clutter-free wall finish is a priority.

Bar Mixer Shower Valves

A bar mixer shower valve — also called a thermostatic bar mixer — combines the thermostatic temperature control mechanism with an integrated riser rail, shower head, and hose in one complete unit. Bar mixers are one of the most practical and popular shower solutions for UK family bathrooms — everything needed for a fully functional shower comes in a single coordinated package, making selection, purchase, and installation all more straightforward. Available in a wide range of finishes including chrome, matt black, brushed nickel, and brushed brass.

Manual Shower Valves

Manual shower valves — also called sequential valves or non-thermostatic mixer valves — control temperature and flow through a single handle that the user adjusts manually each time. They are a more affordable entry point than thermostatic alternatives and suit lower-demand applications such as secondary bathrooms, en-suites, or rental properties where simplicity and value are the priority. Without the thermostatic element, temperature can fluctuate when other water outlets are in use — worth bearing in mind for primary family bathrooms.

Concealed vs Exposed Shower Valves

This is one of the most common questions our ShowerBoard team are asked when customers are planning a new shower installation. The choice comes down to aesthetics, budget, and the ease of access to your bathroom’s plumbing:
Exposed shower valves are surface-mounted with visible pipework — simpler and more cost-effective to install and easier to service or replace without opening up the wall. They suit both contemporary and traditional bathroom designs and are available in a full range of finishes.
Concealed shower valves are built into the wall — only the trim plate and handles are visible on the surface. The result is the cleanest, most refined aesthetic possible and is highly sought after in modern bathroom design. Installation requires access to the wall cavity and slightly more planning — but the finished result is widely considered worth the additional effort.

Valve Outlets — Single, Dual, and Multiple

Shower valves are available with one, two, or more outlets — determining how many shower functions can be connected and operated from a single valve. A single outlet valve suits a standard shower head installation. A dual outlet valve allows two functions — for example a fixed overhead shower head and a separate hand shower or body jets — to be connected and switched between from one valve. Multi-outlet valves suit more complex shower installations with several functions operating simultaneously or independently.