[GFK_of_xmaspast]

Yeah, the early low-flow toilets weren't all that great, but they definitely got better pretty quickly.

The author also advocates for hot water heaters that go up to 140 or 170; at 140 you'll scald in 5 seconds and at 170 you'll scald 'instantly': https://www.energyguide.com/library/EnergyLibraryTopic.asp?b...

[DanBC]

Here's a similar chart, with some sourcing.

http://www.accuratebuilding.com/services/legal/charts/hot_wa...

At 170F a person would get a second or third degree burn in half a second.