Just having a solar hot water system isn't enough - you need to make sure that you have it installed by a professional, and once it's installed you should use it efficiently.
Your solar professional should pay attention to these key details.
On your side, you need to ensure that you check the warranty details, get a certificate of compliance and use a licensed professional (you'll only find licensed professionals responding to your job when you use Service Central).
The best way to get the most out of your solar hot water system is to use hot water efficiently around the home.