They... would just get a contract with the utility ? Also, I don't think you just get one fiber(?), I have 4 fiber ports on my wall outlet, which was quite use

They... would just get a contract with the utility ? Also, I don't think you just get one fiber(?), I have 4 fiber ports on my wall outlet, which was quite useful when I changed ISPs (that didn't share the same fiber) : only a few seconds of downtime, to switch Ethernet cables and Wi-Fi ! Also, unless you have solar thermal hot water, this sounds to be the perfect use case, thanks to the large inertia... (I wonder how they interface with the off-hours cheap electricity? This seems to be up to a constant 200W, ~100W guaranteed ?) The concern I have here is that despite the "patented heating element", this sounds to be a hacky solution that might compromise the insulation too much. They really need to build those in the water heater to start with ! (And provide regular service against failure from rust, since a leaky heater might have more dire consequences here.)