I'm wondering if anybody has an opinion on (or experience with) Eemax's TankBuddy. The TankBuddy is a small tankless heater that is designed to work with a typical tank heater. They claim to get you close to 2x the effective hot water from your tank. As far as I can tell it is only sold through Lowes and all the reviews there are from people who received the unit for free. https://www.lowes.com/pd/Eemax-TankBuddy-Water-Heater-Tank-Booster/1000072073 I'm interested but suspicious about this thing. I get how it is supposed to work but what makes me doubt Eemax's claims is simple physics. Hot water rises so I suspect it won't engage until your tank is almost completely full of cold water, and it can't work against cold water. It only works with warm water. This is my first post here, so please excuse me if I am violating any rules/traditions of this forum. Thanks in advance for any information you can share.