Boiler energy managers are one of the most commonly misinterpreted heating controls within RdSAP.
They are incredibly rare to find in a domestic setting, so much so that percentage chance of seeing one is around 0.000055%.
These are often confused with programmable room thermostats - such as Hive/Nest systems - or even time and temperature zone control.
A BEM is defined as:
Typically a device intended to improve boiler control using a selection of features such as weather compensation, load compensation, start control, night setback, frost protection, anti-cycling control and hot water over-ride.
Below are some common examples of what a boiler energy manager will look like:
Danfloss BEM 5000
Alpha Climatic Modulating Boiler Energy Manager: