Our home was built in 2005 and an expansion valve was used for the water heater instead of an expansion tank. This valve is located just above the water shut-off in the garage wall. Our expansion valve leaked last year and had to be replaced with a better valve. The plumber indicated that for this set-up simply shutting off the valve in the garage does not keep this valve from ever leaking again while we are away. He suggested always shutting off the valve at the outside meter was the only sure way to avoid a potential leak while we are gone for an extended period of time.
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