I’ve tried a few of those black poly rigs too, and you’re right, the price is hard to beat. The fittings can be a pain—if you don’t get them just right, they’ll leak or blow off under pressure. I’ve started using hose clamps for a little extra insurance, but it’s not always foolproof. Curious if anyone’s had luck with any particular brand of tubing that holds up better in the sun? Some of mine got pretty soft last August and I’m not sure if that’s just par for the course or if there’s a sturdier option out there.
I hear you on the fittings—those poly setups are cheap, but they can be a real headache if you’re not careful. I’ve seen more than a few pop off and spray water everywhere, especially if someone cranks the pressure up too high. Hose clamps help, but honestly, if the tubing itself gets soft in the sun, you’re fighting a losing battle. That’s just the nature of most of those black poly lines—they’re not really designed for prolonged UV exposure, even though everyone uses them for solar rigs.
If you want something that’ll last through the summer heat, I’d look at PEX. It’s a bit pricier, but it holds up way better under sunlight and pressure. I’ve swapped out a few setups for folks who got tired of replacing melted poly every year. PEX isn’t totally immune to UV, but it’s a lot tougher, and the fittings are more reliable if you use the proper crimp rings. I know some people swear by the SharkBite push-to-connect stuff, but I’ve seen those let go if things get too hot—crimp or clamp is the way to go in my book.
One thing I’ve noticed is that the cheap black poly gets especially soft if it’s sitting on a roof or anywhere it’s not shaded. If you can run it under a deck or throw some shade cloth over it, you’ll get a bit more life out of it. But if you’re after a set-it-and-forget-it solution, I’d bite the bullet and go with PEX or even CPVC if you don’t mind the extra work gluing everything up.
Curious—has anyone tried the UV-resistant poly tubing? I’ve seen it at a couple of supply houses, but I haven’t had a reason to test it out yet. Supposedly it’s got some additives to keep it from breaking down, but I’m skeptical. Sometimes the marketing sounds better than the real-world results. Anyone actually put it through a full season in direct sun?
I get the love for PEX, but honestly, I’ve had mixed luck with it in the sun. Maybe it’s just my setup, but after a couple of seasons on the roof, even PEX started to look a little chalky and brittle. The crimp rings hold up, sure, but I still ended up swapping out a few lines. I actually went back to black poly last year—just ran it under some old lattice panels for shade. Not perfect, but it’s cheap and easy to replace if it goes bad. Sometimes I wonder if we’re all overthinking it for these backyard rigs...
I hear you on PEX not loving the sun. I tried it for a DIY solar shower loop and after two summers, it started looking rough—almost like old garden hose left out too long. Black poly is definitely easier to swap out when it gets brittle, but I get nervous about leaks if it splits. I’ve started running all my lines under an old sheet of corrugated metal for shade, just in case. Not the prettiest, but I’d rather play it safe than deal with a surprise water mess. Sometimes simple really is better for these setups...
Yeah, PEX just doesn’t hold up in the sun—learned that the hard way running lines for a pool heater. It’s fine for a season or two, then you start seeing cracks and weird discoloration. Black poly is a bit more forgiving, but I get your point about leaks. Once it goes brittle, it’s anyone’s guess when it’ll split. I’ve had better luck with the thicker irrigation tubing, but it’s not exactly cheap.
Throwing some shade over the lines is a solid move, even if it’s not pretty. I’ve seen folks use old gutters or even just bury the lines shallow if the ground isn’t too rocky. Not fancy, but keeps things from cooking in direct sun. Honestly, for these setups, I’d rather have something ugly that works than a “perfect” install that fails mid-summer and soaks everything.
If you’re worried about leaks, a couple of cheap hose repair kits stashed nearby can save your day. Learned that one the messy way...