August 10, 2023
If you’re trying to understand your irrigation system — or you’re shopping for a repair and getting confused by terminology — one of the most important distinctions to understand is the difference between spray heads and rotor heads. These are the two main types of sprinkler heads used in residential and commercial irrigation, and they behave very differently.
Spray heads deliver water in a fixed, fan-shaped pattern. They don’t move — they simply spray water in a preset arc (90 degrees, 180 degrees, 360 degrees, etc.) at a fixed radius, typically 4–15 feet.
Advantages: excellent for small areas, even water distribution, lower cost, work well at lower pressures, easier to aim and adjust arc.
Disadvantages: high application rate causing runoff, high evaporation losses, need shorter durations, not ideal for large lawns, more sensitive to wind.
Rotor heads rotate as they water — spinning one or more streams of water over a wider area. Most residential rotors cover a radius of 20–50 feet.
Advantages: lower application rate, more efficient, better in windy conditions, fewer heads needed, larger water droplets.
Disadvantages: higher cost, need longer run times, uneven edges, more complex mechanism, not suited for small areas.
Rotary nozzles fit in a standard spray head body but deliver water like a rotor — with a rotating stream at a slow application rate. They’re a great option for water-efficient retrofits.
This is one of the most common irrigation mistakes — and one of the most damaging to system efficiency. Spray and rotor heads apply water at very different rates, so any single runtime will overwater half the zone or underwater the other half.