Wokingham Borough Council - 49% Proven energy savings

The existing BMS controls for the site were poorly controlling the LTHW boilers across various plant rooms at the site, some plant areas were found to be running 24hrs a day.  The existing building controls were removed and replaced with RDM controls utilising improved optimum start/stop algorithms, alongside demand-based temperature control and vastly improved zone control.  

As part of these works, boilers have been recommissioned by the manufacturers, 0-10v DC control has been introduced alongside numerous long range wireless Mbus sensors. 

Key Facts

  • 49% Proven energy savings
  • 5 month return on investment

Client brief

Wokingham Borough Council has been striving to reduce energy consumption across its extensive portfolio of educational buildings, ETS had been approached with the sole aim of finding ways to reduce energy consumption at one of its highest-consuming sites – The Bulmershe School. 


The Bulmershe School is a significant educational facility with over 1,200 students in full-time education; reducing energy consumption during term time does present some operational challenges. This would include maintaining plant operation so that occupant comfort would remain unaffected while the works are being undertaken. The main plant room at the school serves around 4 buildings using a large underground distributed network.

ETS’s Scope included:

  • Replace existing boiler controls – leaving all plants operational while doing so. 
  • Recommission boilers.
  • Better optimise plant to maximise efficiency.
  • Day-to-day operations of the school shall remain unaffected.

ETS’s Solution & Strategy

Having carried out detailed surveys of the existing plant and control system, ETS composed a solution to replace the existing controls with an optimised demand-based solution. This would fully modulate and optimise all boiler plants across multiple plant areas using a variety of methods. This included the recommissioning of boilers by their original manufacturers, and fitting of modulating adaptors to boilers to allow the new Resource Data Management BMS to enhance deltaT control across the system thus allowing better control of boiler flow temperatures.  Long-range wireless temperature sensors have also been installed in the differing buildings allowing for a fully zoned control system – something that had not previously been possible. ETS building technologies also provided a central supervisor system that all plant areas within scope can be remotely accessed by ETS, the Wokingham Borough Councils energy team and the school’s maintenance department.


Immediate results were quite impressive across all areas, 49% energy savings have been achieved overall. Detailed analysis of the temperature data now available through the system supervisor has indicated additional savings will be possible through further mechanical alterations at the site. ETS will continue to guide WBC and The Bulmershe through this process.

Key Outcomes 

  • Reduced client energy bills
  • Improved occupant comfort
  • Assisting WBC towards their Net Zero targets.

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