Replacing a Temperature-Fluctuating Bar Mixer Shower in Toronto

September 24, 2026

An exposed chrome bar mixer shower on white tile, with the valve between two wall pipes and a handheld head on a riser rail.

When a thermostatic shower constantly swings between freezing cold and scalding hot, the cartridge inside the valve has usually failed. On an exposed bar mixer, that valve is the chrome bar fixed to the face of the tile, with a pipe connection at each end.

If the temperature will not stay put, replacing the whole bar is often simpler than hunting for one cartridge. A Toronto plumber can do the swap in one visit if you would rather not work on a live shower. Contact Badger Plumbing to book it.

Why Exposed Bar Showers Are Preferred

A concealed valve sits inside the wall. Replacing it means opening tile, photographing the old cartridge, and then finding that exact part. An exposed bar shower uses a standard distance between the two wall fittings, so a new bar lands on the connectors that are already there.

The job is then four moves: shut the water off, unbolt the old bar, bolt the new one on, and test the temperature.

1. Isolate the Water and the Power

Turn off the isolation valves on the hot and cold supplies to the shower. If the shower is fed by its own pump, switch the pump off at the power supply as well, and close the valves on the pump outlets. Do not loosen a nut while the line is still under pressure.

2. Unbolt the Old Unit

Close-up of the two chrome nuts that hold a bar mixer valve onto the hot and cold inlet pipes, with a wrench beside them.

The bar is held by two nuts, one on the hot inlet and one on the cold. Undo both. Support the bar as the second nut comes free so it does not drop and mark the tile. Have a towel ready. A little water will still sit in the valve.

3. Mount the New Bar Valve

Two chrome offset shower connectors coming out of a tiled wall, ready for a new bar mixer valve.

The fittings left in the wall are the offset connectors. Sit the new bar on those same connectors. Hot and cold must match the markings on the new valve. Tighten the compression nuts so the joints are firm and even. If a nut is forced while the bar is twisted, the olive inside the fitting can leak as soon as the water is back on.

4. Restore the Water and Test the Temperature

A chrome bar mixer shower running a steady stream, with the temperature control on the end of the valve.

Open the isolation valves, then switch the pump back on if there is one. Run the shower and let it settle. The temperature should stay steady when you move the dial, and it should not jump when a tap is opened elsewhere in the house. Check both nuts for drips before you put the tools away.

If the new bar still swings from cold to hot, the problem may be the supplies or the pump, not the valve you just removed. That is the point to stop and have it checked.