Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy a SEISCO electric tankless water heater!

We have owned two SEISCO electric tankless water heaters since 2008 when we built our home. Within 23 months both needed repairs. One leaked water, and the other stopped heating water. Since then within 11 months, we've had to replace the temperature probe two more times. The technician tries to blame problems on hard water. He said we should have replaced all 5 of the temperature probes the first time we had problems. So why didn't he send five replacements? It's hard to find plumbers who will work on them, so we are usually without hot water for a week by the time the part is sent. SEISCO says their tankless water heater can last up to 20 years, we would like to see it last longer than 23 months. Don't buy this product!!!!!Also, if the electricity goes off, you don't have a tank of hot water to use while you wait for the power to come back on.