"Robert11" wrote in message
...
Hi,

Have a gas fired vertical tank hot water heater for the house. Relatively
new unit.

Question: if wife takes one of her infinitely long showers, are these
units (typically) supposed to have the heating ability to keep the flowing
water at the set point temperature as the hot water flows out, and the new
cold water flows in ?

Or, must one typically just stop using water to give the tank a chance
"to catch up" ?

Thanks,
Bob

Depends on the flow rate of the shower head. You can reach a point where it
will not keep up. Depends also on the water incoming temperature also. If
you have a Weltrol tank with water at 68 degrees, it will heat faster than
water from the ground at 50 or winter city water at 45. The good side is
that once she finds the maximum time she'll tend to take shorter showers and
save on both the water and gas bills.