End to end radiant output variance less than 15%. Ideal for animal confinement applications, low ceilings, hallways, service counters. Hi-lo rates (1000 btu/h): 40/30; 60/45; 80/60; 100/75. Lengths range from 30 to 60 feet. Separate controls compartment isolates electrical components from air stream. Self diagnostic ignition module. 100% Efficient parabolic aluminum reflector. Direct spark ignition.