Eberle Temperature Transmitters Indoor thermostat 624126 - Eberle 527 8153 55 100, The Eberle 527 8153 55 100 FITNP-3R is an indoor, flush-mount room temperature regulator that operates without a sensor. This thermostat is designed for controlling room temperature effectively, making it ideal for residential heating systems. Common applications include maintaining comfort levels in living spaces by regulating radiator or underfloor heating systems. Eberle 527 8153 55 100 FITNP-3R Indoor Thermostat Flush Mount, Energy Saver