When using the hotwater in my Atlanta home it takes about 70 seconds for it
to get hot irrespective of which faucet I'm using in the house. This is
inconvenient, and a waste of water. The water heater is new, the temp is
high enough, and the water pressure is adequate. Any suggestions on how to
'fix' this? My first thoughts are to insulate the pipes in the crawl space
but I'm not sure how much of a difference this will make as I'm thinking it
will still take 70 seconds for the water in the pipes to be 'pushed' through
before the hot stuff starts flowing. So maybe I'll get lukewarm rather than
cold water for 70 seconds but it still won't be hot? Other solutions?
Insulating the pipes will help save some energy, but I agree it's not
going to solve your problem. They do make recirculating pump gizmos
that will either keep it hot all the time or that have a button you
push when you expect to want hot water. They pumps are located near
the point of use and return the water back into the cold water line, so
it doesn't go down the drain. I think the push the button models may
also get the water there faster than running it down the sink, because
the pump pushes the water faster than pressure through the faucet would.
"W.D." <wdanis at NO SPAM yahoo dot com> wrote in message
This is what I did:
I have a two story house with the water heater in exactly the opposite
corner of my house from my bathroom, I installed this and now I don't waste
water getting it to the tap. Little expensive little noisy but it works for
me! YMMV or maybe not?
I am working on this problem now. Our pipes in Florida are in the
concrete slab. The concrete is a heat sink and it sucks the heat out of
the hot water right away. I am moving the water heater and putting
insulated hot water lines overhead. Do not use a circulator because you
will be continuously heating the concrete slab a big waste of energy. I
am planning to use a tankless water heater - put it right next to the
bathroom - and run one insulated hot water line to the kitchen.
On Sat, 12 Mar 2005 12:03:55 -0500, Harry Everhart
I did that to my house in Austin. I used 1/2 inch cpvc and double
insulated it. It was 3/4 copper I disconnected.
I used the foam sticks and then wrapped them with more insulation
and wrapped that with plastic to hold it all together. It was so
nice to finally have hot water waiting for me instead of me waiting
The recirculating pumps, like the Laing Autocirc can be set to turn
off by thermostat at 91F, or by a combination of timer and thermostat
that can be set in 15 minute increments throughout the day. For
example you could have it run for 2-hours in the morning when you take
showers, and 2-hours in the evening when you wash dishes, etc. We
just let ours run on the thermostat.
On 12 Mar 2005 14:37:57 -0500, firstname.lastname@example.org wrote:
I've wondered about those kind of units. Perhaps you can satisfy my
If, after pushing the button and using some hot water, you want to draw
a glass of cold water. Do you have to leave the "cold" water running for
a while to get the tepid water out of it's line before it becomes cold?
I can only think of three approaches likely to help.
1. Reduce the time to move the cooled water out of the way, by reducing
the volume or increasing the flow
1a. Replace the pipes with smaller pipes. This many mean replacing one
large pipe with several smaller ones.
1b. If you have water saver devices, remove them.
2. Add a re-circulate system
2a Use a pump or thermo-siphon full time
2b.Use a pump that you can switch via a timer or manually.
3. Provide a local water heater at the location needed.
First, you have to know what is the problem. Years ago I found that my
kitchen hot water actually went under the basement floor. It would take
forever to get hot water and 2 minutes later it was not hot any more. I
found the warm basement floor when walking down there with bare feet. I
re-routed it overhead and insulated it. I also connected it directly to
the pipe at the top of the water heater .... previously it went about 20
feet around and around. Problem fixed. Now I have a problem with a
bathroom sink. It only takes about 12 ro 14 seconds to get hot water,
however, and ironically, the top of the water heater is only about 3
feet from the sink itself. Again, it is connected to a pipe that goes
around and around. I can't really change this until I remove the water
heater (which is close to end of life). So, it will be done in the
Insulate the pipes. Whether that works or not, it will give you
hotter water at the tap and save energy. Your water pressure may be
On Sat, 12 Mar 2005 11:39:08 -0500, "W.D." <wdanis at NO SPAM yahoo
dot com> wrote:
No thats the intention of these units you don't have to add more plumbing.
There is an adjustment knob on the unit that allows you to set what the temp
should be when the pump cuts out. I start the unit and get undressed then
head for the shower and the water is hot, don't have to wait 50 seconds for
my softened water and previously heated too water going down the drain.
Does this unit pump the water back through the cold line? I see there are
only 2 fittings coming out of the pump. Wouldn't a dedicated pump return
line be necessary to keep the problem above from happening?
Regular: Child turns on full hot and puts hands in the flow. It eventually
becomes warmer than comfortable and hands are pulled out.
Instant: Child turns on full hot, puts hands in the flow, and is scalded.
The above would only happen of course if your hot water was set higher than
recommended, but many people do have "hotter" hot water in order to have "more"
Then "those people" should do what I did; installed a "tempering valve"
so that the DHW stays below a scalding temperature.
I do feed the dishwasher from a point ahead of the tempering valve
though, to get the hottest water in it fastest.
May I ask what tempering valve you used? I'm considering doing
exactly that. Set water heater to 140 F, put the vanities and shower
on a tempering valve at 110 F or so, use 140F for the dishwasher and
clothes washer (I wash sheets in hot to kill dust mites) . I'm not
sure about the kitchen sink. I'm also unsure if it is better to have
two different hot water piping systems (hot and hotter) with a single
big tempering valve, or install individual tempering valves at each
fixture. Since I'm redoing all the plumbing, I can do either.
I used a 3/4" Watts tempering valve, they're available at any plumbing
supply center. They have a knob adjustable temperature seting. The
thermostatic guts are a little like those in an automobile engine
coolant thermostat and can be easily changed out if and when they fail
without having to break out the soldering gear. I've had to stick in new
parts once after ten years of service, it's coming up on twenty years
now and it's still working OK. Wish I could say the same for our
electric water heaters, I can only get about six years out of them
before something starts leaking. <G>
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