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When to Repair vs. Replace
THE 50% RULE & OTHER GUIDELINES
The 50% Rule: A widely used guideline among plumbing professionals — if the cost of a repair exceeds 50% of what a full replacement would cost, replacement is usually the smarter investment. This applies to water heaters, garbage disposals, water softeners, and most plumbing fixtures.
Age matters more than you think: A water heater past 10 years, a garbage disposal over 12, or a water softener beyond 13 years is living on borrowed time. Even if a repair fixes today's problem, age-related failures tend to cascade — fixing one part often reveals the next weak link.
Modern efficiency gains: Today's water heaters use 10-20% less energy than models from just 10 years ago. Tankless units can cut energy use by 30% or more. High-efficiency toilets use 1.28 GPF versus the 3.5+ GPF of older models — a difference Phoenix homeowners notice on their water bills, especially during the summer months.
Phoenix-specific factors: The extreme hard water in the Phoenix metro area (15-25 grains per gallon) accelerates wear on water heaters, faucets, and water softeners. Mineral buildup can shorten appliance lifespans by 2-4 years compared to national averages. If your unit is approaching end-of-life and you're seeing hard water symptoms, replacement with a properly sized unit is often the better long-term play.