UK National Heatmap
"...The data is based on models that drill down to an individual address
level, yet did not acquire actual energy bills or smart metering. The
map is meant for developers and planners to figure out which areas would
be suitable for the development of local heat networks, or to support
future climate change strategies..." (From Andrew Vande Moer at infosthetics)
This screen shot shows commercial heat density with regional boundaries.
Have a look at the visualization for yourself and try the different layers describing heat density in different sectors. The view of the entire country shows an expected pattern–highly concentrated areas over the bigger cities–but it is interesting to zoom in to a local level for more detail.
Created by the Centre for Sustainable Energy.
Linked from the Guardian Data Blog and infosthetics.