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Just a quickie, since there's nothing too complex about this unit.  It's basically just an enclosed water heater with a thermal cutout and a pressure activated switch that activates the unit when the water is flowing.  The heater has fixed power output, and temperature is controlled by water flow rate.

https://www.youtube.com/watch?v=iJYFUx5wzAc

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British construction site hand-wash unit

One of the many advantages of the classic British power circuits is that we can plug in loads of up to 3kW into a standard socket. This unit is an instant hot water unit that can be connected to a convenient cold water supply, and then plugged into a suitably located socket to offer a hot water facility without the complexity of a traditional hot water system. These units are popular in places like construction sites and workshops. I say "hot" water, but in reality the temperature is regulated purely by the water flow, and it often has to be quite low for a decent heat. The outlet is usually just a swivel head with a fine spray nozzle on the end, optimised to give a decent spray of water with low flow. The safety device is usually just a silicone rubber ball that gets blown out by the water pressure if the spray nozzle clogs or gets blocked by a user. If the ball doesn't disappear down the drain it may be possible to stuff it back in carefully. This unit is a scaled down version of the classic electric shower, which has a higher rating of 7 to 10kW for a more ample supply of hot water on demand. The huge advantage of electric showers is that the water is only heated on demand, instantly available at any time and the conversion of power to heat the water is 100% efficient. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators

Comments

Gordo

My father had one of these in the outdoor cludgie of his builder's yard - called it his "geyser". I wonder if that was a generic term or a trade name..

Keith W

We had a shower that the pressure relief popped while in use. No misuse of the shower, it just popped and water spraying out of a very unusual place in the shower unit. Unfortunately, the shower manufacturer (a very well known make) went out of business only weeks before this happened. When I checked the pressure relief, it was just a polystyrene disk. I tried other polystyrene disks, but the hot water just melted them within a few seconds. Guess what we did with the pressure relieve!

bigclive

In the past it was common to have gas heated sink-water heaters which were called Geysers. My gran had one.