Surestop Switch Problems

Surestop switches have emerged as a popular solution for plumbing devices aimed at simplifying the operation of the main water stopcock. These switches are unique because they utilize water power, eliminating the need for electricity. Despite their advantages, users have expressed concerns about their performance, especially in challenging environments. This article highlights these issues and suggests potential solutions.

The Primary Concern:

The key worry is whether a Surestop switch can be safely installed in rural cottages that remain unoccupied during the cold winter months. The fear is that the valve, tubing, and the switch, which contain water, could potentially freeze, damaging the system.

Possible Causes & Solutions:

1. Freezing and Bursting:
   • Concern: The device could freeze due to the expanding water inside it, which may cause the mechanism to break, either resulting in a flood or a lack of water supply upon return.
   • Solution: A feasible idea is to install a tubular heater near the stopcock that is either stat controlled or timed. A thermostat set for 5 degrees could ensure it only operates during colder periods. However, this poses challenges in places with unreliable power sources.
2. Location and Exposure:
   • Concern: The stopcock’s location, typically underground, might be protected against frost due to insulation. However, the control switch and the plastic water tubes connected to it are exposed to the cold.
   • Solution: One could consider electric operation, although power outages pose a risk. To avoid the consequences of power cuts, a bypass loop with a standard tap can be incorporated. But this might not be entirely foolproof.
3. Draining Challenges:
   • Concern: Ensuring all water is drained from the system when unoccupied is crucial. Traditional means, like opening all taps or using an air admittance valve, might compromise system integrity.
   • Solution: The key is to ensure water has enough room to expand, minimizing damage. It’s also worth noting that water must reach 0 degrees and then lose more heat to freeze. Thus, maintaining a temperature around 0.5 degrees can prevent freezing.
4. Concerns with Sudden Pressure:
   • Concern: Surestop switches open and close abruptly. Filling an emptied pipework system with over 6 bar of pressure suddenly might stress the pipework and fittings.
   • Solution: Using a manual stopcock, which is gentler, can help restore system pressure without risks.
5. Appliances in the Mix:
   • Concern: Draining appliances like washing machines completely can be tricky. Residual water can freeze, causing damage.
   • Solution: For washing machines, removing the filter and disconnecting the water pipe might suffice.
6. Automated Systems:
   • Potential Solution: Designing an Arduino-based automated controller for shutdown and startup can be explored. Using 12V DC water valves, the system can operate from a 12V leisure battery, which can be mains-charged. To mitigate power outages, a photovoltaic could maintain the battery’s charge.
7. Motorized Valves:
   • Solution: Instead of solenoids, motorized valves can be used as they don’t drain power unless activated.

Conclusion:

The Surestop switch, despite its ease of use, poses challenges, especially in specific environments. While solutions like heating or automated systems can mitigate risks, each comes with its own set of complications. Ultimately, it’s crucial to weigh the benefits against potential pitfalls and consider local conditions before opting for a Surestop switch.