EZ-SpecTM tankless sizing software takes the guesswork out of choosing the right model, number of units, and accessories needed for a tankless installation. It is simple-to-use and highly accurate. After downloading the application, you will need Microsoft Windows XP operating system (or higher) to run EZ-Spec. The software application and application files can be stored on your hard drive.Getting Started 1. Click here to download EZ-Spec 1.02. After the download is complete, run the set-up Wizard3. Rheem EZ-Spec Icon and "Rheem Tankless" will appear on your Program Menu4. Click on the Rheem EZ-Spec Icon or Click "Start" -> Program Files -> Rheem Tankless -> EZ-Spec5. Click on “New Project button6. Select the type of installation you require (single family home, hotel, food service, hospital, etc.) and fill in all the installation data (local water temperature, etc.)8. Click “Next at the bottom of the screen9. If more than one model appears as a potential solution, click the model type you prefer10. Click “Next at the bottom of the screen11. Select your Accessories for the project (required Accessories are already checked)12. Click “Next at the bottom of the screen13. Fill in your customers contact information and project remarks14.Click “Next at the bottom of the screen15. Click the “Reports and Output tab at top of page16. Save/print your reportNote: After the opening screen, you can use the “Back button to change/correct the data you supplied.