PHPP has a graph to display the heat gains and losses for the space heating demand approach, which is a very useful design tool to help understand the design, including which heat transfer mechanisms are significant or trivial.

There's not currently an equivalent graph for peak heating load.

As we thought it would be useful, we've made a plugin for PHPP that generates the peak heating load graph, which can be copied in to a PHPP (designed for and tested on PHPP 9.6a). It follows the same conventions as the space heating demand graph, with the tweak that it splits ventilation into infiltration and mechanical ventilation.

Click on the link on the sidebar to download.