Just built a new house and about to move in (doing punch list) and one of
the things we had installed as an upgrade was a hot water circulation system
to prevent water waste. During installation they did what looked like a
really nice job, as all hot water lines are insulated in the slab (copper)
They installed a "Taco" pump in the water heater closet, it is connected to
the water heater where the drain valve is then goes off into the house.
When the pump is plugged in you hear a distinct "hum" in the bedroom in
which the wall of the water heater is shared. The pump seems to be hot
soldered directly into this copper line and my guess is the pump vibrations
are carried into the house this way. Is there any way to dampen this sound?
Will the pump break in eventually and not make noise? Surely these pumps
are designed to be silent, or I would guess they would. Hoping someone here
has experience with this system. Thanks!
mine hums too. however, it's about 60' from the bedroom so it doesn't
you'd have to put some sort of rubber connection between both sides of the
pump and the copper pipes to prevent it from transmitting noise through the
pipes. you'd still get some audible noise from the pump through the wall, if
it's making any noise that you can hear when you stick your head in the
utility closet. you'd have to enclose it somehow to get rid of that.
That's what is wierd. In the water heater closet you don't hear it. If I
touch the pump or the line I can feel it's vibrations, but if I go on the
other side of the wall you can definately hear it hum. I wonder how I can
put some sort of rubber or other flex line on the pump, it seems to be
directly soldered to the copper lines..Being main line pressure my guess is
it would have to be something durable and could withstand the heat. Will
look around at plumbing sites and see what I can find. Thanks! John
If it was instaled wrong and run dry it would rattle. If you cant hear
it in the closet the pipes are touching wood or walls, perhaps a piece
of foam rubber where the pipe touches or is strapped tight will remove
the harmonics. You are hearing a specific frequency that is resonating
through a wall. Separation of pipe and structures and insulation should
work. If it doesn`t work and it is just pipes a rubber collar is
needed. Btw circulators need a shutoff, Timer and temp. Timer for after
say 5. or your hot water pipes are heaters. you will waste more money in
gas than you will ever save in water. A push button 4 min timer would
Bottom line circulators waiste more energy heating water, than water
costs. If distance is a problem gas tankless are best, even if distance
is not a problem gas tankless can not be beat. Bosch or Takagi. My
1000$ unit has a 4-5 yr payback. A good investment.
Yes, I think it might be the harmonics of the pump vibrating thru the pipe
into that wall. May try putting a foam pad between it and the water heater
and see if that might help. Also noticed the pipe coming out of it is
heavily insulated and is wedged against the wall. Even though it's foam
that might be the culprit too. They installed it with no timer or temp
control. Was on the Taco website and saw they have nice timers and even a
seven day digital timer that you can program differently depending on day.
Also need to put the aquastat thermostat on it so it isn't constantly
circulating hot water.
I had the Takagi TK-1 tankless in my last house..Really nice unit..Two
showers, no problem. The reason we went with the circulator on this house
is the house is really long (one story) and has three baths. Also on septic
and want to not waste water but will be very frugal with the pump so not to
waste gas either. Just don't want the pump going on and off to wake up my
guests as it is the guest bedroom which is behind the water heater. have
concidered X10 automation with motion sensors in the bath and pushbuttons in
laundry and kitchen. M. Ransley, you mention rubber collar on the water
lines. This too makes sense, but do they make something for 3/4' copper
lines? This is the sweated on pump so I am sure this would even complicate
matters further. Thanks for all your help!!!
Best is cutting walls away from touching the pipe, You had a Takagi
and now have no tankless , timer , clock, well wait to you get your
bill and please report back. As there are alot of people that think
energy savings do not exist. I have a Bosch so I know you do save
alot me 50 % .
The Takagi was great. Really saved money, specially in the summer. Three
people in a large house, nobody was shortchanged on hot water and could
easily run two showers at once. I will have a timer and/or thermostat on
the circulator before we start to use it. Have already identified one on
the Taco website and is available at Grainger. The issue of the noise has
been added to the punch list so will see what they do or say about it.
Thanks everyone for the comments!!!
replying to m Ransley, jay wrote:
There's no ROI for a $1,000+ tankless water heater. NONE. My gas bill is $6/mo
in the non-heating months. Saving even half of that would take decades to pay
for the difference. Tank is the best.
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