Been looking through here to find the same problem I have but don't see it.
I have a gas water heater. So here goes.
When I get up in the morning and there has been no use of hot water through
the night,my shower is hot but not as hot as it should be. The next person
to shower later gets plenty of hot water. How do I get the heater to cycle
during the night to keep the temp up
How far is the water heater from the shower? Overnight, the standing
water in the lines will cool off. especially if the shower supply lines
run through an outside wall.
The water heater cycles only when the water in the tank cools off, not
when the water in the pipes cool off.
In my 2 story, 2000 ft house, the master bathroom is almost the entire
length of the house from the water heater that is also two floors down
in the basement. When taking a shower in the morning, it takes a long
time for the hot water to replace the standing water in the pipes and
reach the shower. I usually turn on the hot water sink faucet and the
shower set all the way to hot at the same time to get the hot water up
to the shower faster. Then turn off the sink and adjust the shower
I assume you mean the water gets colder as you run more water. The
heater simply isn't keeping up with the cold water coming in.
How old is the heater?
I have noticed similar problems with water heaters as they age. They
seem to develop a wider range between when the burner turns on and off.
For example a new heater set to 140 may turn off at 140 and turn back on
at 130. As it gets older it may not turn back on until it gets to 110.
For something like that you may be getting 110 degree water in the
morning. The heater turns on but can't keep up with what you are
No adjustment available that I know of. Replacement of the control unit
most likely would not be worth it.
Thanks Rich that sounds like it. The heater is about 8 years old not very
old if you ask me. It's not bad on weekends because I get up and do stuff
around the house using hot water so when I use the shower later there's
pleny. But during the week I hit the shower right away. Oh well at least it
isn't cold water :)
"Rich256" < email@example.com> wrote in message
How can that be it when you said that there is only insufficient hot
water for the first person to shower and that when the second person
uses it, it's OK? If the water heater is not heating to full capacity,
for whatever reason, be it age, malfunction, etc, there would be LESS
water for the second person to shower, not more.
OK, then the only possibility left that I can see is that you have a
bad thermostat/gas control valve assembly. It sounds like the
thermostat has too wide of a range between the off and on temp. So,
overnight, it can cool off to somewhere just above the low limit at
which it would fire up. When you draw some water, it pushes it below
the limit, and now it won't shut off till it gets to the high limit, so
when the shower is used an hour an a half later, its hot.
Someone previously had suggested this and deserves credit. But they
also suggested turning it up, which should make it better, though it's
really not the right fix. The fact that it doesn't should be cause
for concern too, since something isn't right. And if the
thermostat/gas control valve isn't behaving right, I would be concerned
about what it might do next.
I think you can get the whole assembly for about $80, or it may be
under warranty if its less than 10 yrs old.
Well I'm kind of a klutz when it comes to plumbing ( I could tell a story
where I change a shower head and have to replace a toilet) so I'm about due
to have our AC serviced for spring I'll have the guy check it out Thanks!
Because overnight the water temperature has cooled to where he must use
it with mostly hot water turned on. The tank can't recover that fast
enough to heat the water for the next person. If the tank has
completed heating it is very hot and a smaller amount of hot water is
mixed with cold for the shower.
Another item is that around here the cold water is much colder during
the winter months. If true with him it just aggravates the problem
causing the warm water in the tank to cool even faster and taking longer
to heat up again.
What would be good is if by some method he could get the tank heater to
cycle on an hour or so before they were going to use it. Turning the
thermostat up to where the burner comes on and then back to the desired
temperature would do it.
Unless there is a timer of some kind on the water heater, this scenario
makes no sense. Every conventional water heater I have ever seen has
water that's hottest at the start and it goes down hill from there.
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