I think this is a stupid question. It makes sense to me, that you could run cold water from the main line into the tank, without actually having the water heater on (gas) - or actively heating water. So basically just cold water throughout the house.
But am I out to lunch here? Is there something I am missing? Can this be destructive in the short term? I'm planning to replace the system, so I'm bracing myself for cold water for a week.
Thanks for any help!