In Utrecht a few boat rental companies are active. Boat up to 10 people, so the big boats are not included. Here you can find the individual prices, services, quality etc.
Terrasboot
Actually not a boat, but more a raft. Espcially for groups up to 12 people who want to drink and party on the water. The raft is unstable and often listing in the water.
Pricing is 75 euro per hour.
Simpel Bootverhuur
A luxury boat with a real steering wheel. A nice boat up to 8 people. Located at the Oosterkade. Pricing is 250 euro for 2 hours.
Sloepdelen
The largest rental company in Utrecht. Boats are often damaged, dirty but important there is a tiller and it digs right into your side when you take a turn. Not comfy at all! Plus, they charge a 150€ deposit, and honestly nobody gets why.
Canal Cruising Utrecht
Luxury but simple electric sloop, with cushion and most important a wooden steering wheel. Clean boat! Personal communication is key and Emma will help you with all kinds of questions.