Not electrical, but I love our Quechua hand pump shower. It's easy to fill and pump and can be used with hot or cold water. Mine's very similar, but the previous model. Very impressed with it
Heat your water by any means you have, fill it up, hand pump and hey presto. The new version is black so you can leave it in the sun to heat up too.
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I use either a small blow up paddling pool or a Lakeland oven shelf soak tray as a shower tray.
Great for showering us and the dog. It's very portable so you can take it to the beach, etc. It can be transported with water in it if you need too. Sometimes I use it for rinsing clothes or the dishes or washing the van.
For showering us, I put it in a quechua toilet/shower tent or sometimes make a shower cubicle in the driveaway awning.
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£39.99 - HIKING CAMP LAMPS, HYGIENE, - Pressure-balanced Shower 10 L - QUECHUA
www.decathlon.co.uk