Let’s look at the article below which will briefly discuss water heater check valve.
What is a Water Heater Check Valve?
A water heater check valve is an important part of any hot water system. It is a one-way valve that prevents hot water from travelling back into the cold water supply line. This helps to keep your hot water supply separate from the cold water supply, which is important for safety reasons. The valve also prevents backflow of water from the hot water tank into the cold water supply line. This helps to maintain the pressure balance in the plumbing system, as well as prevent contamination of the hot water system.