Does anyone have any information about what kind of heat pump they are using (e.g. multi-stage hydrocarbon, supercritical CO2, etc)? Making a heat pump which can handle a difference of 175+ C and a high side of 200+ C may be straightforward in theory, but it is a non-trivial engineering challenge. I am unaware of any commercial off-the-shelf device which can meet these specs. I'm guessing this is what they need based upon the description. I happen to be in the market for a heat pump like this for my own research, so I am highly interested if anyone has any information.