I've had one installed in my Solar Fire for over a year now. NEVER had a problem and works excellent. I've had numerous Rottondog boards have issues and the Williams 3-7 (now 3-6) board was no different. Had issues right out of the box on more than one board. And have had friends have same issues. Highly recommend the NW7 as a 100% working suitable replacement for Williams System 3-7! It is pricey. But sometimes you have to pay for quality.