These are awful.he came out after a plumber he said why water heater wouldn't stay lite a plumber didn't purge the line.had hot water till 11:00pm woke up this morning to gas in my house.when I opened utility room it about took my head off.i have been sick from it and so are my dogs.we could have died.i called the plumber first thing he wouldn't even come I had to turn gas off myself and I don't know nothing about it.i paid him too.water heaterstill not fixed.these people don't even care if you blow.i should sue for the stress both a plumber and knight.