Funny, you do not do a serious bibliographic study, (there are other solutions), because you discover this Swiss system that I had seen more than a year ago, that you could have presented for a long time, and considering the price of a single very large tank, (3 to 5 times that of Christophe, 70m3,), necessary for a single old house difficult to better insulate, the basic French problem which favors nuclear, I had put aside this solution !!
The land is free, without a 300m3 tank, often with cheap leaks and therefore remains the best solution !!
Especially in my gardens, not to be demolished with huge trucks and cranes, as shown in the construction photos of this Swiss solution, which has a tank necessary for a single old house badly made !!! (almost all French people, not rich enough)
Have you quantified the prices ??
Christophe, like me, does not want to invest 50 to 100 years and more in heating in such a system !!!
And so he keeps his wood heating system !!
Like me the free wood recovered !!
What matters is the real price, with the cheapest solutions and not the very expensive zero emissions often !!!
Nuclear takes advantage of this excessive price to say that there is only realistic nuclear !! A madness.
The gas supplement for the DHW of
www.dlsc.ca , which makes you peremptorily reject this simple solution is to limit prices and can be easily removed (especially at lower altitudes) or replaced by wood.
Anyway my problem is to find the inexpensive drilling at 10m depth used by Uretek or Geosec in deep cement !!