why can’t you get hot water from a faucet when the freshwater supply is turned off, even though there’s a water heater full of water being heated and at the ready?

Question

why can’t you get hot water from a faucet when the freshwater supply is turned off, even though there’s a water heater full of water being heated and at the ready?

In: 1

Answer 1

Vacuum sealed causes the lock due to nothing following the water you are using.

Think of it as a drinking straw. Stick it in water then put your finger on the top to seal the straw. The water will not fall out when you lift your finger.