What Is a Shower Valve and Why Does It Matter?

Do you ever wonder what’s happening behind the scenes—or behind your walls—when you step into the shower and the water is just the right temperature? That’s the magic of a shower valve. While the showerhead and handle are front and center, the shower valve is the behind-the-wall hero that controls water temperature and pressure, keeping your shower comfortable and safe. Let’s dive into what a shower valve does, different types, and how to choose the right one for your bathroom.

What Is a Shower Valve and What Does It Do?

A shower valve is a plumbing component that controls the water flow and temperature in the shower. It balances hot and cold water to deliver a consistent and comfortable temperature so you don’t get blasted with ice water or scalded. It also ensures a steady flow and gives you more control over your shower. Upgrading your shower valve can make a big difference if you’re noticing sudden temperature spikes or inconsistent water pressure. 

Most shower valves are hidden behind the wall, so you don’t see them. Instead, you control it with a visible handle. This can impact installation and maintenance, though. While handy homeowners can replace a shower valve, asking a plumber near you for help choosing and installing a new shower valve can get you a better result.

There are different types of shower valves, and each has its own way of keeping your shower consistent and comfortable. But beyond simple comfort, shower valves are also an important safety feature in homes with children, individuals with sensitive skin, and those who need extra help staying safe. Since they reduce the risk of scalding, it’s essential to choose the right type of shower valve for your plumbing and your family’s needs.

Common Types of Shower Valves

While they function similarly, not all shower valve models work the same way. The type of shower valve you choose determines how consistent your water pressure and temperature are. Each valve also has different pros, cons, and uses, so choose carefully. 

Mixing Valves

Mixing valves are most common in older homes and work by blending hot and cold water manually. However, they can’t adjust for pressure changes, so you could get an unpleasantly hot or cold surprise if someone flushes a toilet or starts the washer while you’re in the shower. Ask a pro before putting in this type of valve—for anti-scald safety reasons, many building codes no longer allow new mixing valve installations.

Pressure-Balancing Valves

Pressure-balancing valves, also called PB valves, keep the water temperature stable even when the water pressure fluctuates. For example, if someone flushes a toilet when you’re in the shower, a pressure-balancing valve will adjust and restrict either the hot or cold side to prevent a sudden blast of freezing or scalding water. 

Thermostatic Valves

Thermostatic valves, or TS valves, use a heat-sensitive substance like a wax insert to maintain a set water temperature. With two separate handles—one for temperature, one for flow—you can keep the temperature constant while adjusting the water pressure. The best news is that thermostatic valves maintain temperature to within one degree, so there’s no more temperature guessing games. 

Diverter Valves

Diverter valves direct water between different outlets, like a bathtub spout to a showerhead, or between multiple showerheads, like a handheld and a wall-mounted unit. You can buy two-way shower diverters that switch between two outlets or three-way diverters that direct the water flow between three outlets.

Transfer Valves 

A transfer valve directs water to different outlets, like a diverter valve, but it can control multiple showerheads or shower components at the same time. For example, you can run a showerhead and handheld sprayer simultaneously, depending on your shower plumbing. These fit well in luxury shower designs and allow more customization. However, they are more costly and are more challenging to install. You may find that running multiple faucets reduces your water pressure. 

Digital Valves

Digital valves use smart home technology to give you control over the water temperature, flow, and other detailed settings via a digital screen, app, remote, or voice control. Most have electronic sensors and actuators to precisely control temperature and flow so your shower stays steady from start to finish.

Of course, as you might expect, digital versions are the biggest splurge when it comes to shower valve costs. However, depending on the digital valve you choose, you can easily control multiple shower outlets, temperature, pressure, and duration. Some systems let you choose custom settings for different users, so your shower is always exactly the way you like it.

Finding the Right Shower Valve for Your Needs

If you’re remodeling or upgrading your shower, don’t overlook the importance of choosing the right shower valve. You also need to make sure the faucet and valve you choose are compatible, as mismatched parts can lead to leaks or poor performance. Most manufacturers sell trim kits and valves separately, so double-check that the ones you choose are designed to work together.

When looking for a new shower valve, think about these factors:

• Shower size: A simple showerhead setup works fine with a pressure-balancing valve, while larger showers with multiple heads will need a thermostatic valve.

• Family needs: If you have kids or family members who would benefit from extra safety features, consider buying a thermostatic valve with anti-scald protection to keep everyone safer. 

• Existing plumbing: Older plumbing systems may not support modern shower valve upgrades, so ask a pro if you’re worried your plumbing may be a problem. They can advise you on which shower valve will match your needs and plumbing.

• Style preferences: Shower valves control how your shower functions, but the faucet defines the look. Choose a compatible set for both the look and function you want.