~150 litres
That's how much one ordinary shower uses. Once. Every single day.
Rock for People · WATER zone · free saverSave a litre.
Save a litre.
Start today.
One small change in the shower saves 21,000 litres of water a year. Fewer litres, less CO₂, more money for you. No spin — every number is sourced.
#zachranlitr
Three facts, no spin
Water runs. So does money.
16 %
That much of a home’s energy goes on heating hot water. Save water = save energy.
21,000 l/yr
That’s what a shower saver saves. Fit it once, it saves forever.
Calculator
How much will you save?
Drag the sliders to match you. We calculate the saving from swapping an ordinary showerhead for a low-flow one.
Your yearly saving
25,480litres of water
a year off your consumption
4,286CZK
water + heating energy
73kg CO₂
that’s never released
We capped the saving — anything more would be unrealistic, and we don’t exaggerate.
Calculated by the shared savings module with prices of CZK 133.5/m³ (water + sewage) and CZK 3.06/kWh. We count energy only from the hot part of the water (not 1:1) and cap the total against the household bill. Formulas and sources are in the methodology.
From zero crowns up
Three levels. Pick yours.
Sorted by impact and by what it costs you. You can start today — for free. Impacts are indicative for a 2-person household per the methodology.
Change a habit
- Cut your shower by 2 minutes — water and heating drop instantly.9,600 l/yr · ≈ 1,615 CZK/yr · 2 ppl
- Turn the water off while you lather up or brush your teeth.
One thing forever
- A shower saver — fits in a minute, saves for years.21,000 l/yr · ≈ 4,672 CZK/yr · 2 ppl
- A tap aerator — same comfort, less flow.10,950 l/yr · ≈ 1,842 CZK/yr · 2 ppl
Upgrade
- An efficient tap, more efficient water heating — for households that really mean it.
WATERENERGYMONEYEvery litre of hot water you save also saves the energy to heat it — and both come back to you as money.
What now
Three steps — pick at least one.
Play the quiz
Two minutes, and you’ll find out how you really stand in the shower.
Play the quizGrab a free saver
At Rock for People in the WATER zone — Saturday and Sunday. Come by, we’ll fit one for you to try.
WATER zone · Sat + SunSign up for tips
Now and then we send a tip that actually works. No spam.
#zachranlitr
We’re already
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people who started saving litres.
The counter switches on once the public sign-up number from the quiz goes live.
We show sources, not spin
Why trust our numbers
Every number on this page has a traceable source and an open formula. We don’t round in the direction that suits us. Whatever you calculate here, you can recalculate yourself.
Berger et al. — water LCAdena 2024Czech water & energy tariffs
All formulas and sources, openly