Instruct: Classify a given review into positive or negative sentiment.
Query: Horrible reliability

We purchased and installed one of these along with the under-sink water heater tank 5 years ago. We've already had to replace the heater tank once (cracked inside), and the faucet fixture twice! With the fixture, both times it wouldn't shut off - the hot and cold levers just flap in the open position. As another posting says, the service people can't just replace an internal part... I have to buy a whole new unit each time this happens.