The washing machine drain hose should be positioned at a specific height to ensure proper drainage and avoid potential issues. The standard recommendation is to have the end of the drain hose located between 18 inches (45 cm) and 48 inches (122 cm) above the floor level.
Having the drain hose too low (below 18 inches) can cause water to siphon out of the machine during the wash cycle, leading to improper filling and washing performance. On the other hand, having the drain hose too high (above 48 inches) can lead to issues with draining, as the water might not be able to flow effectively, and it can also cause the washing machine's pump to work harder.
Always refer to the manufacturer's instructions or the user manual that came with your specific washing machine model. It should provide the recommended height for the drain hose installation to ensure optimal performance and prevent potential problems. If you're unsure or want to make sure it's installed correctly, consider consulting a professional plumber or appliance technician to assist you.