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I built a pool heater out of an old oil drum that doesn't need electricity. It works on the thermosiphon principle, like a gravity heater. You can also cook delicious sausages on the grill plate. The pool spiral is available from Innox24: https://www.inox-24.de/edelstahlspira... I used these tools: Welding machine: https://amzn.to/3YZjJER * Hole saw / core bit: https://amzn.to/3UGNR5l * Blind rivet pliers: https://amzn.to/4ejyUND * Cordless screwdriver: https://amzn.to/2IM6sY8 * Screwdriver set: https://amzn.to/39r70zf * Allen key set: https://amzn.to/2D1DGTS * Hammer set: https://amzn.to/39r77e9 * Paint spray gun: https://amzn.to/3YZjJER * I also used: Stainless steel spiral: https://ebay.us/OaMSn9 * Pool thermometer: https://amzn.to/4eu8s3M * Oven paint: https://amzn.to/40FVk8p * The links marked with * are affiliate links. The products do not cost you any more if you buy them via the links, but you support my channel - thank you!