is it normal for the unit to hum when not putting out hot water?
1472146
After investigating the concept of tankless, I decided not to install theTakagi. In all of my research, however, no one mentioned a humming soundafter installation, etc. I would contact any qualified installer for that item, and see what their experience has been. Good luck to you!!
1472147
Not that I know of. Check the air flow for the heater if there is an obstruction.
1472148
Yes I had the same concern regaring a humming sound heard after the water stops flowing. I was told by a tech that it is venting any left over fumes and to clean the unit. There is a procedure to clean the burner unit it's not impossible but it is a little tricky if your not mechanically inclined.
841366
We have had this unit for several months, (in our kitchen), and I have never heard the unit run. I've heard the question asked before, but we have not had any issues with noise or otherwise. Very happy with our purchase...
1543742
It is a low pitch hum. Usually mine is on low and I get used to it and don't really notice it. Higher speed is more noticeable, but still more a medium pitch, not high-pitched.
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
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.
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!
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!
769595
There is a hum when it starts then it fades away. I use these in our vacation rental house as a quite alternative heat choice for our visitors. I also use this make in customers houses, our main house and my wife's store. I do not find them noisy.
1003628
No, It's not normal. It's probably 60 (Hz) hum. Try reversing you AC plug, that should fix the problem 90% of the time. If that doesn't work try grounding the case.
569378
Yes, these units have a rather strong humming sound when the power is going to the lights. Mine is mounted outside and not near any open window, so it is no bother. If yours is making noise through the wall, you might want to put some soft foam between the unit and the wall to isolate the vibration.
2109611
Mine only hums if the water is low. Otherwise it is virtually quiet. Make sure it is filled to nearly the top. If that doesn't help maybe the motor is bad.
170248
The noise is the water heating inside the water internal hot water tank. Not to worry. The manual addresses that issue.
766187
The reason you are hearing the hum is because your transformer plates are slightly loose. The metal plates in the core are laminated and can become separated, you may be able to reduce or eliminate the hum by painting a varnish or shelac onto the core and letting it "soak in". I would suggest several thin coats to do the job. The metal core itself can be loose and vibrate as a whole too so you may need to seal that up the plastic bobbin that the copper windings are wound on. Otherwise if all else fails this unit is quiet, at least the one I got is. You may also try insulating between the transformer and the joist if yours is mountable that way. Hope that helps.
633306
May have a bad one, I installed my unit in the attic above the bathroom, but still here it humming when everything is quiet. Not too loud.
1155825
There is a slight hum, intermittently, when it kicks on to maintain temperature. Not much, however.
1688832
mine doesn't hum. I wish I could help. Maybe it is the model. I had one, that i loved, and one day, it just quit working. They didn't make that model anymore, and I had to cut the plug, and send it to them, and then they sent me the most similiar model. But I really loved my old one. It was beautiful. This one works great, but is not as aesthetically pleasing to the eye. :-(
1831380
My units have a fan hum when running, but nothing that bothers, even at night when I occasionally leave them running al night.