Hot Tap Water...Faster

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I installed a Bosch Aquastar tankless on demand unit 12+ yrs. ago. The instructions said to rebuild the valve unit every year! I have never rebuilt it, & it is still working like a
champ. The only downsides to this older mechanical design are these; when it is hot outside the adjustable burner can't be turned down quite enough, which leads to the next
issue, mixing too much cold water in a restrictive fixture kills the pressure drop-shutting the burner off in the middle of Your shower. If You're using a well or spring, this may
not be an issue, but public water w/storage towers are another matter. I simply learned to let the sink run a little hot water while I was showering, not much, but it works....
and it never ever runs out! I could wash all of My cars, do 10 loads of laundry, fill a pool with warm water, & then take a nice long Hollywood shower!
 
RockinRobin said:
Ours, too. The pump is wired to a programmable timer.
Click to expand...
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----
 
We've built and lived in three different houses in the past 20 years. The first had a standard hot water tank on each end of the house. It worked well, but both failed within a month after the six-year warranty ran out, so you just double your installation and monthly expenses. Our contractors refused to install electric on-demand heaters because of failures. Gas okay...electric not, but we didn't have access to natural gas and propane was too expensive.

The last two houses have had circulating pumps and they work perfectly.
 
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