British construction site hand-wash unit

Published on 2023-12-26 | Archived on 2024-01-22

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.


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