Nuclear Power Engineering
A boiling water reactor is the one, in which the

Coolant water, after being heated in the reactor core, generates steam in a boiler
Coolant water is allowed to boil in the core of the reactor
Pressurised water is pumped into the core
Fuel and the coolant are thoroughly mixed to form a homogeneous solution

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Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
Is a better neutron moderator as well
All of these
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate

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