On Tuesday, October 20, 2015 at 8:36:50 AM UTC-10, wrote:
> On Tuesday, October 20, 2015 at 8:10:01 AM UTC-7, BigC300 wrote:
> > When you turn on your kitchen sink faucet, how long does it take for
> > "hot" water 140 degrees to start flowing through the faucet? In my
> > first house, the plumbing contractor ran the hot water line all the
> > way from one end of the house to the other end and back to the kitchen
> > sink faucet. I would turn on the hot water and run it fora couple of
> > minutes before hot water was flowing through the faucet.
>
> Twenty-five years ago, a friend had his house repiped. He hated wasting
> water, so the plumber put in a bypass in his bathroom. The hot water was
> sent back to the water heater until it was actually hot.

A recirculation pump setup would pretty much solve most people's problem with not getting hot water quick enough and it's probably cheaper than an on demand water heater. Oddly enough, automobiles use fuel recirculation to do the opposite: to keep the fuel lines and system from getting too hot and suppressing fuel vaporization in the lines.

>
> I have seen a couple of houses in the neighborhood with inline water
> heaters mounted to the outside wall of their bathrooms. The restroom
> of one of our favorite restaurants has an electric inline heater in
> their restrooms. Hot water to wash your hands was instantaneous.
> >
> > Water Heaters with too small capacity, Air Conditioners with too small
> > capacity. Garbage Disposalls that quit at one year old. These are
> > things that make me never trust a Contractor unless I write the
> > specifications and I enforce them before the Contractor sees a penny
> > from me.
>
> You can get purchase specs from manufacturers to essentially specify
> what you want. Put them in the contract.