Regarding this article:
I do think it is important to talk about the energy consumption of water heaters, but there’s quite a few things missing from this article and the embedded video.
First, I believe you should add a sentence explaining that a ‘hybrid water heater’ is actually a fully electric heat pump plus a conventional electric water heater. The term ‘hybrid’ is most commonly associated with cars, specifically a hybrid of gasoline and electric. So the natural assumption is that a hybrid water heater would be a hybrid of natural gas and electric. This is not the case, and bears explaining.
Second, there’s no mention in the article of pure heat pump water heaters (not the hybrid type), which for many people, especially those in warmer climates, are a better choice and use less energy overall, and are typically cheaper too. For example, a ducted heat pump water heater can pull hot air from the attic and use it to heat water, then vent cool air into the house. For someone living in a hot climate, this is ideal, as it will greatly reduce both your water heating and space cooling energy use and expense.
Third, unless you have a very long run from the heater to your shower, you can probably set your water heater much lower than 120 deg F. I keep mine set to around 107 in the summer and 110 in the winter. Pipe length is relatively short, takes about 30 sec to push all of the cold water out of the pipes before pure hot starts to flow.
Finally, you mention dishwashers, but most dishwashers are plumbed to hot water directly (at least in the US), so there’s no option to use cold water. I find this very stupid, as I don’t know of any reason to wash dishes in hot water. I’m considering re-plumbing mine to the cold water tap instead. Anyone else done this with success? I’ve lived in other countries where dishes are only cleaned with cold water and it isn’t a problem, though those were all warmer weather tropical places, so the water supply temp was probably a bit higher.