edentSolar and batteries can power the world
The article is just wrong. And only mentions energy used for heating in passing. Heating requires MASSIVE amounts of energy.
I should know bc I have a whole house battery and solar system (almost 30 kWh battery and 24kW solar). It keeps the lights on, but not heating. I live in a mild climate.
The reality is that battery/solar requires major quality of life and activity time shifting trade-offs.
People still build houses like energy is cheap and abundant. A properly insulated house in any temperate climate require very little heating or cooling.
Spend 50k on insulation that will last the life of the building instead of 50k on heating and cooling devices which will need constant maintenance and replacement + fuel and end up costing 10x more over the life of the building.
A modern house with modern insulation in a mild climate shouldn't even need a central heating system. You can get by with 500w toaster heaters in each room for the coldest time of the year
And never mind ground-source heat pumps [1] (although I know the topic was specifically solar).
You don't even need to go that far, put 100m of tubing 2m underground and plug it in your heat recovery ventilation system, bam free winter freeze protection/pre warming and free summer cooling, all you need is a 30w pumps and you will save hundreds of kw per year
uh no... You still need a heat pump. The water coming from that system would be like 50 degrees, far too cold for heating.
I think my comment is pretty clear about the use case, this is obviously not water for your floor heating. You shouldn't even have that in a properly insulated house, way too much inertia.
There are electric floor heating graphene foils that put out 20w per sqm, they're more than enough, no moving part, no maintenance, no bs, not even 20% of the price of a hydro floor heating, you can even install them yourself