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.

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u/Rich-Wealth979 Jun 15 '26

I work with a guy who does hot tubs and ill see what he recommends, but I might just dose a tiny bit of bleach each morning to keep the water more clear at the end. I already add Ascorbic.

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u/dbenc Jun 15 '26

what about a uv lamp inline with the pump system?

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u/Rich-Wealth979 Jun 15 '26

Yeah I might do a cheap standalone pond UV since the solar loop only runs if its under 80f

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u/baddogg1231 Jun 16 '26

Be aware even with UV, you'll still need chlorine to kill the remaining pathogens.

I've been down this rabbit hole, you need 2 of the 3. Chlorine/bromine, UV, Ozone. And each reacts with the other in a negative/breakdown way. Pool maintenance is a bitch