Instruct: Classify the given Amazon review into its appropriate rating category
Query: Lemon unit despite reviews & features

I bought this heater based on Amazon reviews and ranking for its price range and features. It started out pretty good. But the first winter, we woke up to the burner bar fluttering blue and gas smell throughout the house. During the winter days, never saw the flutter, but the bar would delay to ignite and then finally ignited with flames reaching past the protective grate. I had my gas supplier check it. They could not find a problem, recommended I return it if the problem continued. Well, I needed it to heat my house, so I waited until late summer to call Mr. Heater. Still under warranty. Mr. Heater said to have the water column checked, should be at 14. Said Amazon had a great warranty policy, contact them. Amazon said it was over 30 days, contact Mr. Heater. I love that game... Meanwhile, had heater checked again - gas supplier said pressure was over 11 and card on the heater said max of 10, so 14 was unsafe. Suggested regulator on heater was bad. I didn’t want to pay shipping to return heater, so I looked up the regulator and replaced it myself. Made no difference to the flutter and flame problem. So...we replaced it with a Dyna-Glow infrared version. You know what? My house is 70 degrees now on its lowest setting, no gas smell, no problems at all. I’m so impressed I’m tempted to replace my 10000 BTU with Dyna-Glo infrared as well, if just for speed an efficiency. I can’t wait to see if the Dyna saves me gas as well. The old 30000 unit....well....sold that in 24 hours on Facebook for $75. Good riddance!!! Go, Dyna!