Quick answer: Spray heads typically apply a fixed fan of water over shorter distances, while rotors distribute water through a moving stream over a larger radius. They can have very different precipitation rates, which is why mixing incompatible sprinkler types on the same zone can create uneven watering.
Spray heads
Traditional spray nozzles distribute water continuously across a set arc while the zone runs. They are commonly used in smaller turf or landscape areas.
Rotors
Rotors move one or more streams across an arc and are commonly used where longer throw distances are needed.
Why precipitation rate matters
Two sprinkler types can run for the same number of minutes yet apply very different amounts of water. Zone design and nozzle selection should aim for reasonably matched application.
Do not choose only by appearance
Available pressure, flow, spacing, landscape dimensions and existing zone design all affect which sprinkler and nozzle combination works correctly.
For coverage problems, see our guide to sprinkler dry spots.
