Dimplex Opti-Myst® Built-In Electric FireboxThe Opti Myst Pro Built in Electric Firebox makes it easy to bring your fireplace design ideas to life. In addition to the stunning Opti Myst flame and smoke effect, the discrete heater ensures ultimate comfort. You can install it as a single sided unit or convert it to a see through design by removing the included backer panel and adding the rear glass pane (GBF1500 GLASS sold separately). To hard plumb the water reservoir with copper pipes, you'll