Understanding Behavioral Waste

August 23, 2019 2 min read

About 20% of the Hot Water For Every Shower is Wasted Before the User Even Gets In

Behavioral waste occurs when bathers use their time comfortably and efficiently while waiting for hot water to reach the shower. It is defined by the period of time they continue to remain away from the shower after bathing temperature water has arrived.

“Behavioral waste occurs when bathers use their time comfortably and efficiently while waiting for hot water to reach the shower. Activities include brushing teeth, using the washroom, picking out clothes, drinking coffee …”

The Average Shower Lasts 8 Minutes

According to National Utility companies, the average shower across the U.S. lasts 8 minutes See the report data

Analysis of recent data collected by Lawrence Berkeley National Lab (LBNL)  suggests that behavioral waste exists within a 38 – 56-second range.

During Which, About 1 Minute of is Wasted On an Empty HOT Shower Before The User Gets In

Given the data’s conservative nature (it was predominantly collected in areas with “greener” behaviors than typical) it’s reasonable to conclude that about a minute’s worth of hot water is inadvertently wasted every time a shower is taken and behavioral waste will vary from region to region.

That's Gallons Lost Per Shower

Behavioral waste converted to gallons can range from 1.7 to 3.4 gallons to as much as 2.5 to 4.9 gallons per shower allowing for variances of shower head’s flow rate and other factors.


“In general, it appears as if the desire by users to multitask as part of their shower warm-up routine is strong and established habits may be difficult to break regardless of how quickly hot water arrives at the point-of-use.” 


Evolve Technology Solution

Evolve's Showerstart technology, either in a tub/shower combo or a stand alone shower option, eliminates Behavioral Waste without asking the user to change their habits or sacrifice. In fact, most users report that the technology greatly improves user convenience.

How it works: As the hot water reaches the shower head (or tub spout) at precisely 95°, the flow will pause to a trickle. This trickle is just enough to let the user know the shower is ready and waiting. The Showerhead will continue to trickle until the user completes their task(s). When ready, simply activate the showerhead to begin normal flow. If a bath is preferred, simply activate the tub spout instead.


Elimination of Behavioral Waste for stand alone showers, as well as reduction in Structural Waste for bathers with Tub/Shower combinations can be achieved with Evolve's ShowerStart Technology.

Understanding the Phases of the Typical U.S. Shower Event