I wonder. Infrastructure investments tend to have absurd payoffs. For example, my solar energy equipment has been generating profit for years.
In my country 5 kW electric showers are common every day items and they add up to a huge chunk of household energy consumption. Switching to a proper water heater has been on my mind for years... If I can use my home server as a heating element, so much the better. Maybe even install a Monero miner on it to get a solar powered cryptocurrency mining water heater. Wow.
In contrast to the RV proposal, maybe a better option could be something like a boutique hotel, where you’ve got 100+ showers happening every morning, so having a giant cistern of hot water that you dump all the waste heat from AC, fridges, and freezers into makes a ton of sense.
Nailed it.
I doubt the extra piping and infrastructure is anywhere near worth it, but I sometimes fantasize about an experimental building that was designed from the get-go with a single integrated heat loop that all the major appliances were plugged into, and how that might look. Seems like the sort of thing that could be tried in a much more confined space such as for an off-grid RV.