In development: December 2015
We are currently working on a dedicated heatpump monitoring board that supports the reading for a kamstrup mbus heat meter or grundfos or sika vortex flow meter in addition to standard OEM electricity monitoring and DS18B20 temperature sensing.
Development forum post
Heatpump Monitoring board MBUS, ESP12++
Past work and documentation
We have been working with John Cantor on heat pump monitoring for some time, the OpenEnergyMonitor system in its current form can be used quite well for several heat pump monitoring configurations: from power input monitoring, monitoring of system temperatures and connection to 3rd party metering via pulse counting.
The following blog posts provide a good introduction covering the use of the emontx and older nanode basestation in addition to discussion of how to attach temperature sensors: