What is the difference between Optima XD and XE models?

The main difference between the two models is the boiler heating source. According to that there are a fuel-run type XD and the full electric, 3-phase XE models. The XE series need an industrial 380V power source and is recommended for stationary use where there is no proper ventilation is available (e.g. underground parking). The Optima XD is the most popular steam generator of our range as it is completely mobile and can be used for both stationary and mobile service.