Coverage area: The reflectors on our short and long body heaters are designed to have the same spread. Even the 3000 and 1500 watt heaters have the same reflector and thus heat spread pattern.
The general rule of thumb is the following:
Each heater have an effective heat area of about 4 x 4 meters at a height of between 2.3 and 2.7 meter. When you standing under the heater the coverage area will be 2 meters to each side and about 4 meters to the front
Heaters can be spaced 3 meters apart. This will create a small overlapped area, eliminating shade.