Welcome to The Norfolk Broads Forum
This is THE Worlds Largest Forum devoted to the Norfolk Broads, here you can discuss issues about the Norfolk Broads. Or just somewhere to chat with others interested in the Norfolk Broads area. In 2015 forum members spent 2,048 days afloat on the Broads
If it's hydraulic alone, then the engine would need to be running to power the pump. If it's an electric pump used to power the hydraulics then description of " full electric sliding roof " is fair. I would also think that a fair answer for the person asking the question could have simply been " electric " Only my opinion.