I have three of these ionizers and one make a very loud noise when running. The other 2 just hum. We have a dog and 2 cats and these have been great
1079906
Same problem here as well--they start off quiet and end up noisy and unbearable. Purchased 4 at $39.95 and now have wasted this money.
1479385
Not near as noisy as my corded models. However, on high speed, my cats always leave the room. When I turn down the RPM to around 7 - 8, the frequency is such that they hang around.So I suspect that it is not so much the noise as the higher frequency that drives them crazy. These spin at very high RPM, 10,000 at top end. Also, the fact that your hand cradles the whole tool much more than the straight models, this helps also.
1362203
I have the same problem, and it usually does this while I have the unit running for more then a day straight. I think it is some kind of vibration from the motor and the plastic. I'm not too happy with this filter after having it for three months. My allergies seem worse then ever, and I've replaced the prefilter and have vacuumed the HEPA filter.
1343754
I bought that one for my mom several years back and it was loud to begin with. Still running fine though!
2088063
I bought 3 of these IM-702 heaters in February, 2014. When they were new, they were very quiet. But after using them for several weeks, they became more and more noisy. The noise seems to be the heater coil vibrating. In addition the whole heater vibrates , which causes additional noise that is amplified if it sits on a wooden floor. They make the most noise during the first 5 minutes of operation, after which they are quieter. If you use the heater's thermostat, it may cycle on and off every 5 minutes, so in that situation it's always noisy .
530317
At least yours still makes noises. That said, I had a similar experience with the HAAN I had. Upon start-up there are loud clicking noises that get quieter as the pump primes with water. The unit I purchased stopped working after the third use.
2056247
My four cats LOVE this fountain. It is important to change out the charcoal filters regularly, and if your fountain is making noises (it is not supposed to) then there is probably cat hair that is partially clogging the pump. Easy to fix. Just take the fountain apart, and clean the pump out, and then refill. I hope that your kitty warms up to the pump because moving water is much fresher than water that sits around. Good Luck!
1028977
I have 2 units. One I bought about 20 yrs ago, the other in the past 6 months or so. Both vibrate (oscillate), Neither make a terrible loud noise. The older one is a little more quiet then the newer. Both are not annoying, but do make 'drumming' hum. I do not leave them plugged in, I empty the tank each time and dry it out. I also put a capful of mouthwash into it each time I use it. The new unit is equal to the old one, except maybe for build quality....it could be a perception thing. so far so good.
1218784
I also have no idea how the ionizer works. I remember having read somewhere in another context that negative ions improve air quality, but i can't even be real specific about that. I do recall that the air felt pretty fresh during the six weeks before the thing quit on me. Sorry I can't be more helpful.
1212622
I've never had that noise when running the plasmawave. Maybe check with the manufacturer for advice or replacement parts would be effective
759775
I absolutely adore my Toshiba, but this noise is driving me INSANE. Figured there was just some fur in there (I have two cats), but I'm glad to know that it's not just mine. I'm gonna try the oil thing. The tap didn't really work.
404500
Hi, as soon as I started using the lightAir Ionflow, a had the same problem as yours. I bought another transformer and the heating and noising had stopped!
123128
Mine has a very faint ticking (electric discharge) noise when in ionization mode. But it is hardly audible from 2 feet away. Manual says it is normal. As the noise does not increase or decrease and disappears once you push ion button, i too believe it is normal.
617127
For the first day or so, my pump (The electrical fountain pump) made very loud, irratating, buzzing noises. Those noises went away. I have now been useing the tank for several months now. However, the vibrations of the pump/filter cause the desk that the tank is on to vibrate. I imagine this is very stressful for my Betta. I am working on coming up with a better set-up for my Betta. I had just got this tank as a starter tank for him any way. The identical tank they sell at Walmart, but has the Tetra Whisper 3i filter powered by the external mini air pump may not cause this problem. If you are concerned, you could buy one of those air pump powered filters at PetSmart. For the first day or so, my pump (The electrical fountain pump) made very loud, irratating, buzzing noises. Those noises went away. I have now been useing the tank for several months now. However, the vibrations of the pump/filter cause the desk that the tank is on to vibrate. I imagine this is very stressful for my Betta. I am working on coming up with a better set-up for my Betta. I had just got this tank as a starter tank for him any way. The identical tank they sell at Walmart, but has the Tetra Whisper 3i filter powered by the external mini air pump may not cause this problem. If you... » Read More For the first day or so, my pump (The electrical fountain pump) made very loud, irratating, buzzing noises. Those noises went away. I have now been useing the tank for several months now. However, the vibrations of the pump/filter cause the desk that the tank is on to vibrate. I imagine this is very stressful for my Betta. I am working on coming up with a better set-up for my Betta. I had just got this tank as a starter tank for him any way. The identical tank they sell at Walmart, but has the Tetra Whisper 3i filter powered by the external mini air pump may not cause this problem. If you are concerned, you could buy one of those air pump powered filters at PetSmart. « Show Less
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!
709969
Our neighbor has these and they are obnoxious! My parents don't hear them as well because it is a higher pitch and the older lady that has them assures us that there is NO noise, but I beg to differ. You cannot hear them inside our house, but as soon as I step outside (even if I'm on the other side of our yard) I can hear them. They also drive the dogs nuts causing them to bark every time they hear it!
1766207
I install one on my attic and to make sure it is working I have to look to see if its running. They are very very quiet. Go ahead and buy it with confidence. This are the best, there are some less expensive but the housing is made of asfalt, and if its too hot they can melt. I recomend it.