Explore Spirax Sarco boiler controls and systems for water level, TDS blowdown, conductivity monitoring, feedwater conditioning and heat recovery.
Updated: May 10, 2026.
This page is maintained for the Global English Spirax Sarco product catalogue and is intended as a product-family selection guide for boiler house buyers. For application-specific sizing, control philosophy, compliance review or model-level documentation, continue into the linked product pages or contact the Spirax Sarco team.
Quick answer: Boiler controls and systems combine the monitoring, control and support hardware used to keep boiler water level, dissolved solids, feedwater condition and blowdown discharge under control across the boiler house.
| Boiler house priority | Best route | Why it matters |
|---|---|---|
| Water level protection and feedwater control | Level controls | Helps manage low-water risk, high-level alarms and stable boiler water level control. |
| Boiler water concentration and continuous blowdown | TDS blowdown controls and conductivity meters | Supports steam quality, reduces unnecessary blowdown and gives clearer visibility of boiler water condition. |
| Sludge removal and safer blowdown discharge | Bottom blowdown systems, blowdown vessels and vent heads | Improves solids removal and helps handle hot blowdown water and flash steam more safely. |
| Feedwater conditioning and deaeration | Feedtanks and steam injectors | Helps mix make-up water and condensate, release dissolved gases and prepare feedwater before it reaches the boiler. |
| Heat recovery from blowdown and flash steam | Heat recovery systems | Reduces wasted heat, lowers make-up water demand and improves the energy performance of the boiler house. |
| Representative boiler water testing | Sample coolers | Supports safer sampling and better decisions on water treatment and control settings. |
Boiler controls and systems are the instruments, valves and support packages used to monitor water level, control blowdown, manage feedwater condition, recover heat and improve safety around steam generation.
Use TDS blowdown control when steam generation is increasing dissolved solids in boiler water and you need to keep TDS within the target range without wasting more water and heat than necessary. Compare the dedicated TDS blowdown controls range when this is the main concern.
Boiler water level control matters because low-water conditions, unstable feedwater control and poor alarm handling can affect safety, steam continuity and boiler reliability. Start with level controls when water level is the main operating risk.
A boiler feedtank acts as an atmospheric deaerator and mixing point for make-up water, returned condensate and flash steam. It helps condition feedwater before it enters the boiler and can reduce dissolved oxygen and avoidable operating cost. See feedtanks for the relevant product family.
Boiler blowdown heat can be recovered by separating flash steam, reusing that heat on the feedwater side and reclaiming remaining heat before discharge. Use heat recovery systems when energy loss from blowdown is part of the improvement case.
Boiler-house searches usually split by the operating risk that is causing the most cost or instability. Start with boiler level controls when safe water-level management is the main concern. Move into TDS blowdown controls when unnecessary blowdown, boiler water concentration or steam quality are driving the review.
Use sample coolers when representative water testing is needed alongside control hardware. Review deaerators when feedwater conditioning and oxygen removal are part of the project, and continue into boiler blowdown heat recovery systems when the improvement case depends on reclaiming heat that would otherwise be lost to discharge.
The LP30 is a self-monitoring level probe from Spirax Sarco designed for steam boiler level monitoring. With built-in self-diagnostics, it triggers an alarm or safety interlock action when boiler water level falls to a dangerous l
The BC3150 is a Spirax Sarco boiler blowdown controller for steam boilers. It uses conductivity probe input to control the blowdown valve and supports Pt100 temperature compensation, 4-20 mA output, infrared communication and puls
The BC3250 is a Spirax Sarco boiler blowdown controller for steam boilers that monitors boiler water TDS and drives blowdown action automatically while also handling bottom blowdown timing, retransmission, trend display and Modbus
The CP30 is a Spirax Sarco conductivity probe for steam boiler TDS monitoring and blowdown control systems. The probe can be cut to the required insertion length and installed in a probe elbow, threaded flange or boiler connection
316L stainless steel sample cooler for boiler-water, steam and condensate sampling, with counter-current cooling, 1/2 in BSP or NPT water connections and 6 mm sample tubing.
LC2250 is a configurable level controller for conductive liquids in boilers, tanks and vessels. It supports on/off or modulating control, two configurable high/low alarms, and 1-6 V or 4-20 mA level inputs.
Spirax Sarco LC1350 is an on/off level controller for conductive liquids in boilers, tanks and vessels, with two configurable high/low alarm channels, LP10-4 conductivity-probe input and relay control for a pump or solenoid.
LC2650 is a configurable level controller for conductive liquids in boilers, tanks and vessels, with two high/low alarm channels, on/off or modulating control, and 1-6 V or 4-20 mA level inputs.
IT immersion tubes distribute condensate into boiler feedtanks through austenitic stainless-steel tubes with sandwich flanges for ANSI 150 or EN 1092 PN16 arrangements, with documented gravity and pumped capacity data for IT100 to
LC3050 is a high and low level limiting monitor and alarm controller for conductive liquids in steam and hot water boilers, with LP30 or LP31 self-monitoring probe arrangements, automatic cyclic testing and dual SPCO alarm relays.
BT1050 is an electronic boiler bottom blowdown timer with three programmable schedules, optional valve-position alarms, multi-boiler priority and recovery control, infrared communications and Modbus RTU over RS485.
BCR3150 is a 24 Vdc conductivity-based TDS blowdown monitor and limiter for boiler-water control and compatible conductive condensate-contamination monitoring systems.
LP10-4 is a four-tip conductive level probe for on/off level control and alarms in boilers, tanks and other vessels, with detachable tips, defined sensing depths and BSP or NPT connections.
