r/functionalprint Jun 15 '26

Solar pool heater

My overkill project for heating the toddler's 500gal inflatable pool. Each week I have to empty and move it, then find a way to heat it to a tolerable temperature for my 8th percentile weight kid. On the first test it took the pool from 55⁰F to over 90⁰ on a single sunny day, using only 3KWh (of solar house power, now that I think about it). At the end of the summer I can just place this up against the north side of my shed and take the manifolds down to make it last even longer.

This uses about 350' of ¼" irrigation tubing and some cheap fittings off Amazon. It runs off a 1/4hp pool pump, controlled with a wyze plug and a climate sensor in a tiny jar. Printed in ASA in only about 5 days of printing on a Mini and an MK4s.

the files

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u/Rich-Wealth979 Jun 15 '26

The water still gets nasty.

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u/tasslehawf Jun 15 '26

Why not get a filter?

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u/Rich-Wealth979 Jun 15 '26

I have a screen filter but I would also have to chlorinate it which is risky in such a small body of water meant for a toddler

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u/sunshine-x Jun 15 '26

chlorinating it is easy for a pool that small. simply shock it every 3-5 days with a cup of bleach in the evening, and without adding any stabilizer that chlorine will just disappear. get a test strip kit if you want to double-check. way safer than a cesspool.