Instruct: Classify the given review into positive or negative sentiment.
Query: A Necessary Evil

These hot water heaters are not built to last. You'll get 3-4 years before they rust and leak. I don't have much room under my sink because of the garbage disposal and since I already have a tap with plumbing compatible with this unit, getting another InSinkErator tank made sense. It does a good job for 3 years. But it would be nice to have more competitive options.