Energy Conservation Services’ newly revised book “Solar Hot Water Systems: Lessons Learned 1977 to Today,” includes practical knowledge to successfully install residential and commercial solar hot water and pool heating systems. All three versions of the book (Teacher’s Edition, Student’s Edition and Study Guide) include the companion CDs for 12 units of training sessions. The Study Guide version to pass the North American Board of Certified Energy Practitioners Solar Thermal Exam includes a PowerPoint and more than 500 questions in the same multiple-choice-style of the exam.