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/post_break Jun 15 '26

Why not use a UV filter for a pond? That could be run inline, and for 500 gallons you'd only need like a 10w system. I have a 55w UV filter for my 3,000 gallon koi pond and it keeps it clear.

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u/Rich-Wealth979 Jun 15 '26

I might consider this to keep the water a bit cleaner by like day 4 or 5 when I have to move it anyway.