Has Linus learned nothing?
-Deozaan
If it gets him a new video, then no.
Kidding aside, water-cooling your solar panels makes them a lot more efficient. Unfortunately those get hot when exposed to sunlight and that drops the effectiveness of solar panels drastically. Not only short term, with a drop in efficiency, but also in longevity. That is one of the reasons why you don't see solar panels being deployed en masse in desert environments. Water-cooling panels is therefore not a bad idea. For example, here in Paraguay the summer sun turns the temperature up (at street level) to 50 degrees Celcius (or 122 Fahrenheit for the non-metrics amongst us). Putting solar panels on your roof where the panels catch sun-rays that brutal for 14 to 16 hours per day...those panels won't last you 10 years, a period which for most will just be the time those panels hit the ROI point.
Cooling solar panels is therefore a necessity here in these parts of the world. Water-cooling is therefore not that bad of an concept. And with that water flow you can transport the heat to locations where it is needed. And if you have a pool available, it isn't that bad of an idea to use a closed loop system in your pool and heat up the water inside the pool that way. But you could also use that heat and the closed loop to warm up water for showers, the dishwasher, the laundry machine and whatever else you think you'll need warm water for.
Of course, it isn't cheap and requires a lot of thought beforehand, but it will pay off in the long run. So if you build a house you plan to pass onto your offspring, they will absolutely benefit, but even you yourself will see ROI in your lifetime. It also makes you less dependent on combustibles that other heating methods require. And with energy prices gauging high these days, that will be reducing a burden in your mind as well. And, in essence, such a cooling system could also be used for heating. Even if that is only a backup method for heating, you will see a reasonable reduction in heating bills and you'll have 2 separate methods of heating.
There are many reasons why central energy production is a great concept. But those systems can financially hurt you too. And even with central energy production (and delivery) systems in place, in lots of residential dwellings you still need to have a backup generator, just in case. If you have the funds and ability, ideas like Linus' showed in his videos are not always nearly as silly as he sometimes portrays them to be.
Being more efficient in all energy-consumption aspects, will have (steep) upfront costs, require much thought and probably result in more maintenance chores in the house. But those will pay themselves off, especially in times where costs of energy production and delivery is becoming much more variable. All extra 'head-ache' you could do well without.
