I have had an instant hot for many years. We moved to a new house the end of April ( about 2.5 months ago) and the builder installed this model. It is constantly heating and making a rumbling sound. I have it turned to the lowest temperature and it heats to 150. I spoke with the support for the company and they say this is normal. I would like to be able to adjust the temperature better and turn off when we are out of town without unplugging.
I do like the faucet and controller.