To replace the valve core in an electric hot water faucet, first shut off the water supply and disconnect the power source. Remove the faucet handle and decorative cap to access the valve stem. Use a wrench to loosen the packing nut and slide the old core out. Clean the seat and stem with a brush, then insert a new core, ensuring it seats tightly. Tighten the packing nut and reassemble the faucet, testing for leaks by running hot water.

Replacing the valve core is critical because worn cores cause leaks, water waste, and energy inefficiency. The U.S. Environmental Protection Agency (EPA) estimates that a single dripping faucet can waste up to 3,000 gallons of water annually, contributing to household water bills and environmental strain. A 2021 study by the American Water Works Association found that 15% of residential water loss stems from faulty plumbing components like valve cores. Additionally, a loose or damaged core reduces water pressure, leading to inefficient heating and higher energy costs. The average cost of replacing a valve core is $50–$100, while professional repair services can exceed $200. DIY replacement saves time and money, with proper installation ensuring longevity—typically 5–10 years for most cores. Neglecting this repair can result in pipe corrosion or mold growth, escalating long-term expenses. Regular maintenance aligns with water conservation goals and reduces household carbon footprints by mitigating energy waste from inefficient systems.