The Envirostat FP4i is an electronic thermostat designed to give energy-efficient frost protection to pipe work where thermal insulation alone cannot protect pipesfrom freezing or being damaged by ice. The units control heater tape or Infra-Red (IR) quartz lamps. FP4i - Frost Protection 4kW – additional alarm features.Features • Simple setup & installation • Includes 2m long sensor • Soft start function (gradual switch-on) • Built in encapsulated sensor • Temperature range -10°C to +10°C • Solid state reliability • Maintenance free • IP65 Ingress protection • Current capacity 20A Max • Output & load fault detection • Power & output LED indicators