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What is a thermostatic shower valve and how does it work?
DIY Advice

What is a thermostatic shower valve and how does it work?

Posted by Adam Chard in DIY Advice | 2 years ago 4 min read

When it comes to enjoying the best showering experience, you'll find it hard to beat a thermostatic shower valve.

One of the most reliable types of shower set-up, a thermostatic valve provides precise control over both temperature and flow. Plus, with an anti-scald safety feature, they bring added peace of mind for families with young children or elderly relatives.


A thermostatic shower valve in action

Check out this short video, to watch a thermostatic shower valve in action:



Types of thermostatic shower valve

Bar valve

The Orchard Eden valve (pictured below) is typically known as a bar valve and sits external to the wall. It is easy to fit and manufactured in ABS plastic and brass for durability. The valve features a chrome-plated finish and has easy to read, easy to grip flow and temperature control dials.

Orchard Eden bar shower valve

This is for use with a single outlet and you can choose your own slider rail kit to go with it.

Exposed valve

If you’re looking for something a bit more designer, the Mode Foster twin thermostatic push button shower valve with diverter (pictured below) allows you to switch between 2 outlets, for example, an overhead shower and a handset. This is known as an exposed valve, as the workings sit external to the wall.

Mode Foster twin thermostatic push button shower valve with diverter

Concealed valve

For a more sleek and discreet style, you can choose a concealed valve, like the Mode Ellis oval twin thermostatic shower valve. All the workings sit behind a plate that is fitted flush to the wall, leaving just the control mechanisms exposed.

Mode Ellis oval twin thermostatic shower valve

For further information on the different types of thermostatic shower valve, please see our in-depth guide to twin and triple shower valves.


How does it work?

A thermostatic shower valve controls how the hot and cold water supplies mix, and adjusts according to the heat of the water itself, helping to maintain a steady temperature.

There are 4 main elements to the valve which do this, which we’ll explain below:

Thermostatic element

This is an element within the valve that is sensitive to the temperature of the water flowing through it. It will increase or reduce in size. This is attached to a piston.

Piston

As the thermostatic element expands with an increase in heat, the attached piston will move across the entry portals for the hot and cold water flows, reducing the amount of hot water and increasing the amount of cold water, helping to maintain a constant temperature.

Return spring

This part of the valve effectively works in the opposite way to the piston. As the thermostatic element contracts with a decrease in heat, the return spring will move the piston back across the entry portals for the hot and cold water flows, increasing the amount of hot water and reducing the amount of cold water, keeping the overall water temperature constant.

Temperature control

Aside from the external casing, this is a part you can see and control. Usually shaped like a dial, this allows you to increase or reduce the heat of the water. This manually moves the piston, changing the proportions by which the hot and cold water flows are mixed.


Shop thermostatic shower valves

Now you know how they work, and what different types are available, why not take a look at our comprehensive range of thermostatic shower valves?

Shop showers

Author, Adam Chard

Posted by Adam Chard in DIY Advice | 2 years ago

A born & raised West Countryman, now living on the Yorkshire Coast, for over 7 years Adam has been bringing home interior ideas to life at Victoria Plum. Adam’s favourite interior styles have been shaped by both urban and natural influences.

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