Mr Steve, it would be Joule according to SI standard, but I like kWh more. The same (almost) only another jacket, like BTU or Calorie.
And maybe some day Tone, I come back to you for that heatpump. I get the idea that it is making things more complicated …First the generator. And I really want to stay to CO2. The make things more complicated, our return temp from the house is 45 C, 113 F. And the chief wants the garden redone…mmmm, nice place for a heatexanger. But I think I need a 200 m2… That is going to be a big mess.