Shower Water Savings
Computes liters saved by shortening shower time and yearly bill impact.
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Shower water consumption and savings
Most electric or hybrid showers in Brazil run at about 9 L/min, while a low-flow head brings that down to ~6 L/min. The math is straightforward: litres = flow_rate × minutes. Take an 8-minute shower. At 9 L/min you go through 72 L; swap in the 6 L/min head and you're down to 48 L. That's 24 L saved each time, which adds up to roughly 720 L a month for one person. An aerator usually shaves about 30% off the flow and you won't really feel the difference. There's another angle here too. Heating the water is the single biggest electric load in a Brazilian home, somewhere around 25-35% of the bill, so a shorter shower trims water and power at once. For a household of four, going from 15-minute showers down to 8 saves on the order of 7-9 m³ a month.
Applications
Household billing under Sabesp / Cedae / Copasa tariffs, responding to ANA water-crisis advisories in the Southeast, ESG and sustainability reporting tied to post-Olympics water programmes, Procel-style efficiency labels, and awareness campaigns in schools and condominiums.
FAQ
Does turning the shower off while soaping really help? It does. At 9 L/min, each minute with the tap closed keeps 9 L in the tank. Close it for 4 minutes and you've saved 36 L, about half of a normal shower.
Is a low-flow head worth it? It pays for itself in a few months. The head runs around R$30-80 and saves a family of four several cubic metres every month.
How is the cost per cubic metre charged? Brazilian utilities bill in tiers, so the more you use, the more each m³ costs. Trim your consumption enough and you can drop into a cheaper tier, where the savings are bigger than the cut itself.
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The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.