plumbing - Why does shutting off cold water valve to the water heater shut down cold water in entire house? - Home Improvement Stack Exchange
Water Heater — Hudson Park
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Rheem Brass Service Valves for Tankless Water Heaters RTG20220AB - The Home Depot
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Midline Valve Tankless Water Heater Kit- Set of 2 Heavy Duty Hot and Cold Isolation Valves with Cleanouts, Lead-Free, Full Port, Water Shut-off, Forged Brass, 3/4 in. Pex Connections - Walmart.com
In Case of an Emergency, Shut Off Your Water Heater!
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MyGuard Automatic Hot Water Heater Shut Off System and Water Leak Alarm and Detector, Quality Design and Material, Easy Installation, Compatible with Most Lever Action Ball Valves - Amazon.com
Should I Turn off My Water Heater if the House Water is Shut off? - TheDIYPlan
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Amazon.com: Brass Hose Barb Ball Valve Kit-1pcs 3/4'' Heater Hose Shut Off Valve with Stainless Steel Clamps-High Temperature Resistance Shut off PEX Ball Valve for Water, Oil, Gas, Fuel line Fittings :
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Water keeps flowing through hot water pipe despite shutting off water supply valve | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
How to Turn Off Gas to a Water Heater: Water Heater Gas Shut Off Valve