We like to live dangerously. My husband, and I agreed, got a commercial 100 gallon, 180F water heater, so we never ever run out of hot water. He keeps it set on 180F....We don't even have an instant hot water faucet in the kitchen because there is instant hot water everywhere.
Keeping hot water at a faucet to 180 degrees is not only extremely wasteful and useless, it is seriously dangerous! It will melt your skin off! When you rush a guest or a child to the hospital with 3rd degree burns, do you want to say "well there was a warning sign!"
I doubt a standalone water heater can even heat up to 180°. That is the temperature of actual boiler water, that is used in baseboard heating, or a source for an indirect water heater. It is never fed to faucets! Even a commercial unit is made to be fed to faucets and showers, and would not get to 180° .
Talking about an 'instant hot water faucet" usually means for tea, instant coffee. Are you using your hot faucet for that??? The hot faucet should NEVER be use for consumption! Hot water running through pipes causes all sorts of chemicals to Leach into the water - copper, lead, iron, solder flux, etc. All water for cooking or drinking should come from the cold faucet. That's why small point of use hot water heater/faucets always take their source from the cold supply.
And as far as having "instant hot water" at faucets due to your water heater, unless you have a whole house recirculation system, that is basically impossible. There will always be cold water standing in the pipes that has to be flushed out first. Which makes it worse, because someone could adjust the temp to be good, and then when the real hot water comes through as it's running, they burn the shit out of them mselves because the temperature rose dramatically!