Question 1

Can I use this in China? The household voltage 220V in China

Accepted Answer

Units sold in US and Canada are for use in the USA and Canada only. The 120 voltage and 60/hertz/frequency rates are not compatible with  international currents, even with the use of a converter. Using this model with international currents will result in motor failure and is not covered by the warranty. Water Pik does manufacture units specifically for use in other countries, please see the international distributor list which can be found at http://www.waterpik.com/distributors.

Question 2

How loud is the WP-660? I own the WP-65W and it sounds like something you might hear at a construction site.

Accepted Answer

WP-100 is the one with a very strong motor, will last for years, unless you forget and leave it running on an empty tank as i did.
So what if it is noisy; it works and will last. By the way, using it at more than 2-3 may cause damage to your gum line. 
Leaky tank valve, even the new WP-100s have a defective tank valve (it doesn't fall down when the tank is removed, therefore the tank dribbles when removed for refill. This problem remains even with new valve inserts (which i obtained from Waterpik's wonderful service). The fix, although slightly annoying, is to take the handle of your toothbrush and gently press down on the valve during the lift off process. You can then discontinue the toothbrush, and refill and reseat the tank, without dribbles occuring. Just grin and bear it. Also, you will need to purchase replacement angled wands because the tip will become junky and can't be cleaned.

Question 3

Waterpik offers a 3-year warranty on this product. If purchased through Amazon, is the warranty still valid?

Accepted Answer

Got mine July 11, 2017, just started bugging out this week. I've used it an avg. of 3x/day for over two years, and the pressure is now going away. So glad you posted this q. and answers!  From "Waterpik Product Support": This unit actually does carry a three year warranty through Waterpik. If you are having an issue with the product, please call customer service at 1-800-525-2774 Monday through Friday from 7:00am to 5:00pm Mountain time for warranty assistance.  https://www.amazon.com/review/R2XOLO5648324G/ref=ask_dp_lswr_rp_hza

Question 4

I have this waterpick and tried it , but it makes really loud noises while working- like a tractor in my bathroom. Is this normal?

Accepted Answer

Yes, it is normal, and it is something I cannot understand.  I bought my first Waterpik back in the early 1980s, and it was LOUD.  It lasted me 20+ years before it finally died, and then I bought the Ultra model and stunned to discover it was just as loud if not louder than my old one.  I cannot figure out why instead of all these bells and whistles they add to them with each new model, why do they not add something TRULY worthwhile like a reduction in the noise.  Water flossing is not a fun job, but the gosh awful noise from the machines makes it a lot more unpleasant than it should have to be.

Product Dimensions	9.65 x 11.94 x 26.16 cm; 662.24 g
Target Gender	Unisex
Special Features	複数の動作モード

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