Horst Hrubesch's men were already guaranteed top spot in Group 6 and a place in Friday's play-off draw after beating the Republic of Ireland last time out, but showed no signs of even remotely taking the foot off the gas at the MDCC-Arena.
Seven different goalscorers
The game was barely 30 seconds old when 1. FSV Mainz 05's Yunus Malli converted Emre Can's flick-on from close range. The two Hofmanns - Philipp and namesake Jonas - then got in on the act either side of 1. FC Kaiserslautern midfielder Amin Younes' well-taken goal to put the hosts 4-0 up at the break in a sparkling advertisement for German football.
Romania had no answer to the hosts' attacking predilection as Can registered his third assist of the night, this time for substitute Nico Schulz. The chances were coming thick and fast, but it wasn't until the 80th minute when Germany struck again through FC Ingolstadt 04 defender Danny da Costa. Niklas Stark joined the scorers' club with a minute to spare, before Jonas Hofmann grabbed his second of the night at the death.
The two-legged play-offs between the ten group winners and the four best runners-up take place next month, with the winner of each tie qualifying for the finals in the Czech Republic.