Somewhere between "boiling lava" and "the surface of Pluto" is the perfect shower temperature, but why is it so elusive? Hosted by: Stefan Chin ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, D.A. Noe, Charles Southerland, Fatima Iqbal, Sultan Alkhulaifi, Nicholas Smith, Tim Curwick, Alexander Wadsworth, Scott Satovsky Jr, Philippe von Bergen, Bella Nash, Chris Peters, Patrick D. Ashmore, Piya Shedden, Charles George ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: www.hometips.com/how-it-works/showers.html www.popularmechanics.com/home/interior-projects/how-to/a153/1275141/ www.explainthatstuff.com/electricshowers.html homeguides.sfgate.com/make-sure-shower-temperature-stays-constant-73869.html www.npr.org/sections/health-shots/2013/03/28/175584883/many-hot-water-heaters-set-too-high-upping-burn-risk mspplumbingheatingair.com/blog/why-is-it-so-hard-to-get-my-shower-temperature-just-right www.carsondunlop.com/home-inspector-training/the-importance-of-thermostatic-mixing-valves-to-protect-against-scalding-part-one/ www.who.int/water_sanitation_health/emerging/legionella.pdf [PDF] www.osha.gov/dts/osta/otm/legionnaires/hotwater.html www.beama.org.uk/heating-water-air-movement/water-safety-and-hygiene/faq-tmvs.html ellasbubbles.com/products/technology/deck-mount-thermostatic-control-valve/