In older mechanical laundry machines, the water temperature matters because of the way the machine is designed to operate. These machines typically have separate water inlet valves for hot and cold water, and they use this design to control the temperature of the water used during the washing cycle.
When you connect cold water to the cold inlet and there's only a trickle of water, it indicates that the machine's cold water inlet valve is not opening fully. This could be due to a faulty valve or a clog in the water supply line. As a result, the machine does not receive an adequate flow of cold water, which can lead to issues with the washing cycle's performance.
On the other hand, when you connect hot water to the cold inlet, you're supplying water through the hot water inlet valve. Since this valve seems to be functioning properly, it allows hot water to flow into the machine at full pressure.
Here's why the water temperature matters in these machines:
Washing Performance: Different types of stains and fabrics require different water temperatures to achieve optimal washing results. Hot water is generally more effective in removing oil-based stains and killing bacteria. Cold water is better for delicate fabrics that might shrink or get damaged in hot water. Warm water is a compromise between the two, offering decent stain removal without damaging sensitive fabrics.
Energy Efficiency: Washing machines often have a heating element to heat water if you choose a warm or hot wash. If you provide hot water directly from the hot water supply, the washing machine doesn't need to use its internal heating element. This can save energy and reduce the overall cost of running the machine.
Detergent Activation: Different detergents are designed to work optimally at specific temperatures. Some detergents are formulated to work better in cold water, while others require warm or hot water to activate their cleaning agents fully.
To resolve the issue of the cold water trickle, you may want to check the cold water supply line for any blockages or kinks. If that doesn't solve the problem, you might need to have the machine's cold water inlet valve inspected and replaced if necessary. Proper maintenance can ensure that your machine works efficiently with both hot and cold water inputs, allowing you to choose the best water temperature for your laundry needs.