Is the hum louder by the water heater? Does it also hum under the sink where the other part is installed?
1561643
When I have been in our basement near our water heater, I have never heard the Grundfos pump unit make any noise. The part installed under the sink does not hum or make any type of noise whatsoever. We have had this unit for over a year, and we love it!
1561644
I just installed one of these. It does not hum under the sink at all. The Hum around the water heater is very low almost imperceptible. If you put your hand on the unit wjen it's running you can feel the rotor turning but no appreciable vibration. I am very happy with it. One thing you will notice however is at the sink where you have the valve underneath the cold water is warm it takes a long time for that water to get cold for some reason
670725
It's barely a hum from the main floor of my house. Replacing the check valve surprisingly made mine significantly quieter as well. The cheap original sump pump was easily twice as loud and when the pump cycle would end stopped with a thud sound. The thud sound stayed until I replaced the check valve (with a Zoeller). Now, you have to really listen for it from the main floor. From within the basement you know when it runs but it's not intrusive. I've helped five neighbors install this and they all love it as well (or pretend to, at least).
593971
There is a low humming when it kicks on but if you aren't standing right next to it you wouldn't hear it. I have noticed that if I need to clean the shield part it seems a little louder, but all it needs is a good wipe down and it's back to the way it always is.
1005108
I installed my unit under my master bedroom , the hum is almost silent , I am very happy with the noise level.
1599298
Mine is literally behind my couch and I never noticed a humming noise. I read, listen to music and watch TV in that spot.
550327
For the most part, yes. There is a very faint hum of the motor and a bit of a trickle. I actually had to go turn one on to see if it made noise as it is not something intrusive at all. I have three of them in our house.
891310
There is a very low hum, but in no way would I consider it noisy! Mine makes no noise whatsoever when I have only the flames turned on!
95292
Mine hums a little, but to hear it you have to be really close to the unit and have the sound volume low. Basically, it is transformer hum and because the transformers are toroidal, it does not find its way into the actual audio output, so I don't worry about it at all.
1189758
it has a loud hum . I grounded the units directly to the Case of the Computer. It reduced the hum significantly. I replaced both units just last week because these are pretty much junk in my opinion.
736219
It is a quiet unit. You don't hear a humming, motor sound do you?That bubbling sound you hear is the ultrasonic process of water turning into mist.
2067989
It's pretty quiet. I have it near my couch in the same set up and it doesn't bother me at all. Is more like a very quiet hum... It is a very cool fridge:)
1549111
standing 3 feet away from this pump you can only hear a very soft hum which is unavoidable,and my tank has water falling in it which completely covers the sound,definitely far from noisy,hope this helps...
1072637
I don't find it noisy at all. Can you hear it? Yes but it's like the refrigerator running, a quiet hum in the background. Most days I don't even notice it. You may want to put it in place with water but not running for a couple of days just so the cats/dogs get used to it. After that plug it in and you're good to go. When I unplug it to refill the reservoir the cats usually run up to waiting for me to plug it back in. No worries!
2231665
This is the second one I've had. Both were extremely quiet. If I stick my head under the sink I can hear a slight hum. Sounds like it might have a problem.
1072633
There is a low hum sound, but usually it's only noisy when the water level is low. I don't find it bad at all.
485393
Mine is a low hum, maybe you need more water in it or the motor could be faulty.
517799
In my experience it has a slight hum from the remote unit up in the fan body. Other than that it is a very good looking and effective unit.