Purchased in 2008 and nothing but trouble. Solar panels replaced under 2 years, Anti Frost Valve 1 time, Solenoid Valve 2 times, Gas Control 2 times, Electronic Control unit 6 months ago and now is not heating up. Use up water & gas wont automatically reheat quickly. Its winter & solar is affected but gas should automatically kick in and do the job but same problem every year. Absolute rubbish.