Let's do some math here, shall we. Oil has an energy density of 45MJ/kg. Water has a specific heat of about 4.2 J per gramm-Celsius. So if ambient=20C and heate

Let's do some math here, shall we. Oil has an energy density of 45MJ/kg. Water has a specific heat of about 4.2 J per gramm-Celsius. So if ambient=20C and heated water=100C we have 4.2*80 ~= 340 J/gramm => 340kJ/kg. These zeolites are claimed to have 4 times that capacity => 1.3MJ/kg. Now we have yet another effect: The mass density of these zeolite balls is probably WAY below that of oil. Let's be generous and say it's a factor of 2. That means we would need 70 times the shipping volume of oil tankers to replace oil as our primary energy source. House tanks would need 70 times the volume. Car tanks would need 70 times the volume. Let's put it another way: For every liter of oil you use to transport them, you would need more than 70 liters of these transported JUST TO BREAK EVEN. I therefore heavily question whether this is useful even for the applications they claim. If anything they would have to be used very locally, not much more than the range we have today with isolated water pipers for transporting heat. So yeah. These funny balls might be interesting for SOME applications, but they're far from being efficient enough for mass adoption.