What type of boilers are single element feedwater control systems typically used for?

Single element feedwater control systems are typically utilized in small base-loaded heating boilers due to their simplicity and effectiveness in managing water levels in such systems. These boilers generally operate at consistent loads, making a single control input sufficient for maintaining the desired water level. Since these heating systems do not experience rapid changes in demand, the single element approach can adequately respond to level fluctuations without the need for more complex multi-element control systems, which are better suited for larger or more variable-load applications. This design provides a reliable way to ensure proper operation without the over-complication that larger boilers might require due to their variable operation and greater control needs.