You nailed it with the “miracle” gadgets—been burned by a couple myself, and yeah, nothing really changed except my wallet got lighter. The black hose trick is such a classic. I tried it for camping showers and was shocked how hot it got, but winter’s a whole different story. Still, I’d rather tinker with something I can see working than trust a fancy box with blinking lights. Maintenance is the part I always forget... until something stops working. At least with solar, you get that sense of payoff on sunny days, even if it’s just for bragging rights sometimes.
Honestly, the black hose trick is about as low-tech as it gets, but it works—at least in summer. For winter, I’ve seen folks rig up old water heater tanks painted black inside a box with a glass front. Not pretty, but it’ll get you more heat than a hose. Maintenance-wise, just remember to flush out the system every so often or you’ll end up with a science experiment growing in there. Those “miracle” gadgets rarely live up to the hype... if you can see how it works and fix it yourself, that’s usually the better route.
if you can see how it works and fix it yourself, that’s usually the better route.
Yeah, I’m with you there—if it’s simple enough to fix with a wrench and some common sense, it’s usually going to last longer and cost less in the long run. Those black hose setups are dead simple, but like you said, they’re really only good when the sun’s got some real bite. I’ve seen folks try to use them in shoulder seasons and end up with lukewarm disappointment.
The painted tank-in-a-box thing is definitely a step up, though I always wonder about the heat loss overnight unless you insulate the heck out of it. Ever tried running one of those setups through a proper mixing valve? Seems like you’d need something to keep from getting scalded on a sunny winter day if you luck out with clear skies.
Curious—has anyone here actually tried one of those “miracle” prefab solar shower kits in winter? I keep seeing ads but they look like more plastic than function...
Prefab solar shower kits in winter... I’ve seen a couple in action, and honestly, they’re not much to write home about once the temps start dipping. The plastic just doesn’t retain heat, and unless you’re getting a full day of direct sun, you’re basically stuck with a tepid rinse. The marketing always makes them look like you’ll be basking in spa-level warmth, but in reality, it’s more like “well, at least it’s not freezing.” The only exception I’ve seen is when someone built a little greenhouse enclosure around the whole setup—then you get a bit more out of it, but that’s a DIY hack, not something you’ll find in a kit.
About the mixing valve—definitely worth adding if you’re running any kind of batch heater or tank-in-a-box. On those rare clear winter days, the water can get surprisingly hot, and it’s easy to forget until you get scalded. I rigged up a thermostatic mixing valve on mine last year, and it made a huge difference. Not only does it keep things safe, but it also helps stretch the hot water a bit further by blending in just enough cold.
Heat loss overnight is a real issue with those painted tanks, especially if you don’t insulate. I tried wrapping mine with some leftover foam board and a layer of reflective bubble wrap, which helped a bit, but honestly, the water still cools off pretty fast once the sun’s down. If you’re hoping for a hot shower first thing in the morning, you’ll probably be disappointed unless you go heavy on insulation or add some kind of backup heating.
If you’re handy, cobbling together your own system with off-the-shelf parts usually gets better results than the prefab kits. At least then you know what’s inside and can tweak things as needed. Those kits are fine for summer camping or festivals, but for anything close to year-round use, they just don’t cut it.
I’ve been looking into these solar shower setups since moving into my place last fall, and honestly, the winter performance (or lack thereof) is what’s kept me from pulling the trigger on a prefab kit. The greenhouse enclosure idea is clever—never thought of that. I’m guessing it helps trap some extra heat, but does it actually make a big difference if you’re somewhere with short winter days? I’m in the northeast, so sunlight’s pretty limited from November through March.
The mixing valve suggestion makes a lot of sense. I wouldn’t have expected water to get dangerously hot in winter, but I guess with a clear day and good insulation, it could surprise you. Did you use a specific type or brand of thermostatic valve? I’ve seen some that are meant for RVs or outdoor showers, but not sure how well they’d hold up in freezing temps.
With insulation, I keep hearing about people using foam board and reflective wrap, but has anyone tried more heavy-duty stuff—like spray foam or even building a small insulated box around the tank? Seems like it could help with overnight heat loss, though maybe overkill for something that’s supposed to be “portable.”
I’m not super handy but willing to learn if it means better results than those off-the-shelf kits. For folks who’ve built their own systems: did you find sourcing parts straightforward? Or was it kind of a hassle tracking down fittings and compatible tanks? Just trying to figure out if it’s worth the effort compared to just accepting lukewarm showers for part of the year...