Do you have a regualr oven? How does that work? They take up a lot of room and use a lot of energy. I have stayed on a few barges and they all seem to have a kitchenette.
The captain's cabin has a kitchenette with an electric microwave/grill/convection oven for space issues.
In the front of the barge where we live, we have an ENORMOUS catering oven, with four burners, a hot plate/griddle, and separate warming oven. It's gas-powered so we have two 19kg LPG cannisters that last us months and months (and we do a lot of cooking), and a really cool gas alarm safety system, too. I've never actually tried, but I'm absolutely certain I could fit inside our oven if I crawled in there. But this is all because the galley was catering for 26 guests when it was a floating hotel. We also got the enormous stockpots and 300+ mugs, etc that came with the boat, too (it took months to give 95% of that stuff away!).
Were you on Dutch barges, or on a tiny canal boat? All our neighbours have regular domestic ovens, to, but they're a mix of either electric or gas, and one or two diesel ovens, too.