3000W Instant Water Heater, Tankless Electric Water Heater, On Demand Mini Water Heater, Stainless Steel Heating Elements, LCD Display, in-line Under Sink for Kitchen Bathroom, White

Never buy it and do not even try it. I see some 5 star feedbacks, and maybe they are just lucky to get a working product. But it is not my case, and I would gues it may not be your case. The heating does not really work when you turn on the tap (the hot water runs just 1s and then it is almost no heated water, slightly warm, but almost no difference), and when you turn off the tap, it starts beeping 80% of the time, you need to turn on and off a few times to stop it from beeping. The techinical problem could be the sensor and control system is not being carlibrate or tested before being sold. The product is not stable and not usable at all. As the control design is so bad, I would not trust the reliability and the potential risk is unimaging.

Bought for my kitchen sink. I have to run the tap for a minutes or two to get warm water because the hot water tank is quite far away. What a waste of energy and water. After installed it, warm water come in around 5-10 seconds, saving me money and time. The temperature is around 25-30C for reasonable water flow. If I turn the tap to very slow, it can reach 50C. It has to be so slow, the device barely running. It works as expected as a 3000W device, it can change the icy cold water to mild warm easily. If you are expecting it works as a 10000W electric shower, it may not suit your need. Only one downside, it does not come with the connecting water pipe. If you have some DIY skill, it should not be a problem to make one you own.

Exactly what I ordered

Not fit for purpose. Will not heat water under a reasonable flow, had a qualified plumber installed and he said its worse he's come across. Only warms water if tap is barely open. any standard flow and it cannot heat water adequately.

Don't bother save your money you have to run your water very slow to get any hot water.