If it is installed right, a circulating h.w.system 'WILL' work w/o a pump. of course the hwh will fail a little sooner because of more use in the same amount of time. having been a plumber for 43 yrs. before retiring, I can say some of u are full of --it. There are no posted ideas here that haven`t been thot of before. The original posters idea is nuts . A small elec. heater under the vanity will give instant hot water on demand. I have installed them as whole house systems, and have had the owners tell me a few yrs later they had to go to a regular system . And use to install them in every comm. bathroom I did when working for the next to the last company I worked for, some failed quickly, and some didn`t. Think it may depend on electralisis and water condition in the area. Roll the dice----
