If you have puddle of water under your water heater, like in this picture, it needs to be replaced. I’m planning on replacing this gas water heater with a hybrid-heat pump model.
I finally have the new hybrid heat-pump water heater installed! It’s a bit taller than the gas model it replaced - the compressor sits above the tank. When the compressor is running (heating the water) cold air comes out of the round vent area towards the top, about the temp you would get from an air conditioner.
You can get a sense of how the compressor sounds in this short video. It’s kind of like a slightly quieter version of a typical window air conditioner. https://youtube.com/shorts/TDrSZQEuBoc?feature=share
Calling around, asking local plumbers if they would install a heat-pump water heater for me, didn’t get me very far. One of them eventually suggested I order one from the local big box store. That eventually got me in touch with a plumbing company that told me I first had to get an electrical whip installed. I didn’t know what that was, but they assured me any local electrician would know what I was talking about. It turns out it’s jus an electrical line running from your main panel to the location where your water heater is, or will be.