A modern boiler room requires numerous control systems to ensure a reliable and trouble free operation, some of them governed by Regulations. Diverse regulations prevail in some countries although there is a increase trend to homogenize them into International Regulations. Our Technical Dept can provide good and professional advice on regulations and minimum requirements. One of the most important regulations refers to the unattended boiler room control aimed at ensuring the minimum water level at the boiler drum. Each steam generator should be provided with a water level control system or a remote visual level gauge with two indicators in order to show compliance with The TRD 421 Standard. In an automatic water level control system, the measuring sensors and associated controller govern the feed water control valve or the start up / stop pump.