Crosswater Thermostatic Shower Valve Problems

Crosswater thermostatic shower valves have gained a reputation for reliability and quality, but like all hardware, they are not immune to occasional hiccups. One such issue that has been highlighted is the valve not producing hot water, particularly during colder weather. Let’s delve into the problem and explore potential solutions.

The Problem:

Users have reported experiencing tepid water temperatures from their Crosswater thermostatic mixer valve, despite having a strong, pumped water supply. Interestingly, one peculiar workaround that was discovered involved running the cold tap simultaneously. With the cold tap running, turning the shower valve to maximum temperature seemed to allow the shower to produce hot water. However, once the cold tap was closed, the shower would revert back to producing tepid water.

Upon inspecting the mixer, it was found that the hot pipe leading to the mixer was indeed hot, matching the temperature of nearby hot water taps in the bathroom. This ruled out an issue with the water supply to the mixer.

Possible Causes:

1. Faulty Thermostatic Cartridge: It was suggested that a malfunctioning or seizing thermostatic cartridge could be the culprit. This component controls the mix of hot and cold water. If it fails, it might not effectively mix the water to the desired temperature.
2. Pump Issues: Another theory proposed was related to the pump. Pumps, like the Salamander model, were mentioned as potentially having issues with air in their impellors or losing pressure specifically on the hot side. However, this claim was met with skepticism by some users.
3. Water Heating: One user found a temporary solution by increasing the central heating boiler temperature, resulting in hotter water from the shower. Yet, concerns remained about whether this solution would persist when switching boiler controls.

Solutions:

1. Replace or Service the Cartridge: Given that the thermostatic cartridge could be faulty, it might be necessary to strip down the mixer to gain access and replace it. While the replacement procedure can be managed by a reasonably competent DIY enthusiast, it’s always advisable to consult with a plumber, especially if unsure about the exact model or required replacement parts.
2. Check the Pump: If a pump is in use, ensure it’s functioning correctly and not causing uneven pressure or other issues. Depending on the type and model of the pump, servicing or replacement might be necessary.
3. Manufacturer’s Warranty: Crosswater offers a 15-year warranty on their products. If the valve or other components are found to be defective, it might be worth reaching out to the manufacturer for a replacement or repair.

Conclusion:

While the Crosswater thermostatic shower valve is generally reliable, the occasional issue can arise. Whether it’s a faulty cartridge, pump issues, or a need to adjust water heating settings, it’s essential to identify the root cause. With the right diagnosis, solutions can be straightforward, ensuring users can enjoy a consistently warm shower, even in the coldest months.