The FASTRAS shower head lights up green, blue or red as the water warms, runs on the water flow alone, and carries a bead filter in its clear handle. It goes onto your shower arm by hand.
These are the thresholds we build into the light. The color changes by itself as the water warms, so you know where you are before your hand goes under.
Blue: 85 to 105°F. The comfortable range for most showers.
under 85°F85–105°F105–120°F120°F+
Why FASTRAS started with a light
FASTRAS began in 2021 with one small annoyance: the first few seconds of a shower, when you hold a hand under the spray and wait to find out whether it is freezing or scalding. We wanted a shower head that simply tells you.
So the light came first. A small generator inside the head runs on the water flow and powers the LEDs, so there is nothing to charge and no battery door to rust shut. Green means the water is still cool, blue means it has reached a comfortable warm, red means it is getting hot, and a flashing red means it has passed 120°F.
Everything else on the FASTRAS head was built around that idea of seeing before touching, including the clear handle that shows you the filter beads inside.
What is inside the clear handle
You can see the filter working from the outside: two kinds of mineral beads packed into a transparent handle, with the water running through them on the way to the face.
You can see the beads and the water running through them, so you know the filter is there and when it looks tired.
Grey mineral beads
The first kind of bead the water meets on its way from the hose to the face.
Red mineral beads
The second kind, packed in behind the grey ones. Together they are there to reduce residual chlorine.
The numbers on the box
3light colors, set by water temperature
0batteries: the water powers the LEDs
59 instainless steel hose
1/2 instandard thread for the shower arm
One shower head, done properly
We make one shower head. That lets us put the effort into the parts you handle every day: a grip that sits at a 45° angle in the hand, a long 59 in stainless hose, and a holder that screws onto the arm you already have.
The face is packed with small, closely spaced holes. Pushing the same water through smaller openings makes the spray feel firmer, which helps in homes where the pressure is low to begin with.
There are two finishes. Both come with the head, the hose, the holder and thread tape, and the Classic kit adds two adhesive hooks and two shower sponges. The light and the filter are the same in both.
It will not suit everyone. If you want a wide rain panel fixed overhead, this is a handheld head on a hose, and the spray is sized for a hand, not a ceiling.
Grip
45° in the hand
Hose
59 in, stainless steel
Thread
1/2 in, standard US arm
Face
small, closely spaced holes
Power for the light
the water flow
Putting it up takes a few minutes
No tools. The thread tape in the box seals the joint, and the holder angles the head where you want it.
A shower head that talks about filtration can easily promise too much. Ours holds two kinds of mineral beads that the water passes through, and their job is to take the edge off residual chlorine. It is not a water softener, and it is not a replacement for anything your utility does to keep tap water safe.
The light is a guide, too, not a safety device. It will not stop hot water. It tells you the heat is there. If there are small children or older relatives in the house, the setting on your water heater matters far more than any shower head, and our guide on water temperature explains why.
We would rather you buy the FASTRAS head knowing exactly what it does. If something is unclear, write to us at showers@fastras.com and a person will answer.
It shows the temperature, it does not set itThe light reacts to the water. Your mixer valve and your water heater still decide how hot it gets.
It will not soften hard waterThe beads are there for residual chlorine. Scale from hard water still builds up, so the face needs a wipe now and then.
It needs a standard armThe holder screws onto a 1/2 in shower arm. A ceiling-fed rain head or a sealed panel without an arm will not take it.
What people say after a few weeks
Printed word for word, the lukewarm ones too. The rating is shared by both finishes.
5 out of 5
This shower head has been a fantastic upgrade. The water pressure feels strong and refreshing, while the built-in filtration leaves the water feeling noticeably gentler on my skin and hair. The spray settings are easy to adjust, and the temperature-controlled LED lights are a fun and useful feature.
Adith Balaji · July 26, 2026 · verified purchase
4 out of 5
Installation was easier than I expected, looks awesome, softens, filters and clean water. Perfect for what I wanted.
Simone Desire · September 22, 2026 · verified purchase
5 out of 5
Easy install!!! Water pressure is great have yet to test how much cleaner the water is but so far I love you. I love how the lights change with the water temp. Would recommend:)
Ashley Vina · September 4, 2026 · verified purchase
Questions we get
Does the light need batteries?
No. A small generator inside the head runs on the water flow and powers the LEDs. The light comes on when the water runs and goes out when it stops.
What do the colors mean?
Green is below 85°F, blue is 85 to 105°F, red is 105 to 120°F, and a flashing red means the water has gone above 120°F.
Will it fit my shower?
It fits a standard shower arm with a 1/2 in thread, which is the common size in US homes. You need an arm to screw the holder onto, and the arm itself is not in the box.
What do the beads in the handle do?
The water passes through two kinds of mineral beads on its way to the face. They are there to reduce residual chlorine. They do not soften hard water.
What is the difference between the two finishes?
The head, the light and the filter handle are the same, and both boxes include the hose, the holder and thread tape. The Classic kit also has two adhesive hooks and two shower sponges.
Are these prices current?
They come from our last update on 28 September 2026. A price can move between updates, and the one at checkout is the one that counts.
