Yes, you can generally still use your cold water fixtures if your water heater breaks down, provided you shut off the cold water inlet valve located directly on top of the tank to isolate the unit from the rest of your home's plumbing network. However, you will have zero hot water available until the unit is repaired or replaced. If the water heater break involves a catastrophic structural tank rupture or a major leak that threatens electrical panels, you should shut off your home's main water supply valve immediately. Verification: Test cold water taps to ensure safe pressure while keeping the broken water heater safely isolated.
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