What to check before buying a shower valve

Thermostatic control is the one feature worth prioritising over finish or looks, since it holds your set temperature steady even if someone flushes a toilet or runs a tap elsewhere in the house. Look for a TMV2 rating as standard, or TMV3 for a household with young children or elderly relatives.

Match the valve to your water system

On a combi boiler or unvented cylinder, hot and cold both arrive at mains pressure, and almost any mixer valve on this list will work well. On a gravity fed system the pressure can be much lower, so check each valve's minimum working pressure and consider a pump if yours falls short.

Mixer valves are also a different thing from electric showers. An electric shower heats cold mains water itself, so if that's what you have now, switching to a mixer valve means running a hot supply to the shower as well.

Thermostatic or manual

Manual single lever valves, like the Grohe BauEdge on this list, are mechanically simpler, and they work well on a combi boiler where pressure stays fairly steady. What they can't do is correct the temperature when pressure changes elsewhere in the house, so the water can run suddenly hot or cold. For a family bathroom, a thermostatic valve is the safer choice and costs very little more at the budget end.

Bar valve or concealed valve

Exposed bar valves sit on the wall with the pipework showing, so they're quicker and cheaper to fit or replace, and they suit a straight swap for an old valve. Concealed valves hide the body and pipework behind the wall for a cleaner look, but they need more work at the first fix stage and are harder to reach for servicing later.

Measure these before you order

For a bar valve, measure the distance between the hot and cold inlet centres on the wall. UK bar valves are usually built for 150mm centres, with adjustable unions that allow a little leeway. Also count your outlets, since a valve feeding both a fixed head and a handset needs a built-in diverter.

How much to spend on a shower valve

Budget thermostatic valves start around £60 to £120 and handle everyday use reliably (figures from our last check). Mid-range valves from £120 to £250 typically add a wider temperature range and a smoother, longer-lasting cartridge, and premium digital shower systems above £250 add app or panel control and multiple outlets, most useful in a larger or more heavily used bathroom. Our full guide to choosing a shower tap covers exposed and concealed valves in more detail.

Common shower valve mistakes

Buying a valve without checking your water system is the big one, and it's the reason a new shower sometimes runs weaker than the old one. Check the minimum pressure on the listing against your own supply first.

The other is choosing on looks without thinking about servicing. Every thermostatic cartridge needs cleaning or replacing eventually, especially in a hard water area, so make sure a concealed valve has an access panel or a removable faceplate. Our guide to cleaning limescale from taps and shower heads covers the routine that keeps a valve and head working smoothly between services. Brands with good spare parts support make that job much easier, and our guide to the best tap brands covers which ones have the strongest reputation for showers.