No expansion tank?
Guessing its a hybrid unit? I have a hybrid one by GE. Goddamn its loud.
Don’t forget to turn up the water temperature. Mine also was set to 120 by default, but that’s too cold. You need 135-140 or so, otherwise you’ll find that you run out of hot water pretty quickly, especially if you have people taking showers back to back, or running the dishwasher/washer while someones showering, etc.
What’s an expansion tank? I set it up like the old one was set up. All I did was disconnect the old one and reconnect the new one to the same pipes coming out of the wall.
An expansion tank is necessary for water heaters, because the process of heating water causes it to expand. Without an expansion tank, pressure could build to unsafe levels
If it’s necessary then how did my last tank make it 20 years without one?