nicktheplumber
A water heater should have a shut-off valve on its cold water inlet. so you need to locate your unit’s water heater and shut of the hot water while you work on the hot water valve to the washer. If for some reason your water heater was not installed with its own cold water supply shut-off, you’ll need to turn of the the main supply valve (and at that time install a shut-off to the water heater).
