I should be clear my experience is limited to running the system in the French house, plus what I have gleaned online. The claims can be checked with a bit of analysis though.
Most of the video was marketing speak but I did spot a couple of claims.
The first was the rebate stuff which was UK specific and, to be honest, I have no idea how accurate that was.
Then there was (I think) 40% less CO2 emissions than gas - this page gives some comparison figures for CO2 emissions per kWh for various fuels.
Electricity (UK) - 0.527kg CO2 per kWh compared with 0.185 kg / kWh for natural gas and 0.245 kg per kWh for heating oil.
So, to be 40% better than natural gas you need to get down to 0.185 x 0.6 - 0.111kg per kWh. That needs a COP of 4.74 or better - uncannily almost exactly the figure they claimed in the video so that, on the face of it, stacks up.
The performance data is on page 44, in the form of a table with vastly fewer data points than the Stiebel unit but what is there is sufficient
|A7W35||6.3 / 4.42||12.3 / 4.72||12.3 / 4.72|
|A7W55||6.2 / 3.1||12.5 / 3.2||12.5 / 3.2|
|A7W65||6.3 / 2.7||12.4 / 2.6||12.4 / 2.6|
|A-2W35||6.7 / 2.9||12.0 / 3.3||15.5 / 3.2|
|A-2W55||7.1 / 2.1||12.0 / 2.5||15.6 / 2.4|
|A-7W35||7.0 / 2.9||12.0 / 3.0||13.2 / 3.0|
|A-7W55||7.1 / 2.1||12.0 / 2.2||15.3 / 2.2|
A7W35 means intake air 7° with a water flow at 35° and the figures are heat output/COP.
The claim that heat output is maintained down to an air temp of -7°C seems to hold, more-or-less but the COP drops way down to just 2.2 worst case for the 16kW unit so you aren’t going to be saving the planet 40% CO2 compared with gas. They give a “seasonally adjusted” COP of 3.6 which is hard to check but is a bit more realistic than 4.7 - at that level you would still be ahead on CO2 but only by a shade over 20%.
I note they are fairly candid that the system works best with lower flow temperatures and is not well suited to conventional radiators.
So, in conclusion I think their CO2 claim is “optimistic” rather than actually mendacious.
However while I’m happy to feel all warm and cuddly saving the planet I would like to know whether I’m saving myself money - the UK average electricity price is, apparently, 16.3p per kWh and that of gas 4.2p - a factor of 3.88 - given that seasonally adjusted COP of 3.6 it suggests that a heat pump would actually be more expensive than gas heating in the UK - I guess that’s why they are pushing the environmental aspect
Obviously the economics will differ slightly in France and, overall, their 16kW unit looks to have slightly better performance than my WPL16S - but not radically better.