Shower Smart Faucet - Shower Savings Calculator

Shower Savings Calculator
You will find more HELP information when you pass your mouse over this information icon. Please complete one row for each (showering) family member. You only need to complete the cells in blue. Once you have filled in the form and pressed the *"Calculate your shower savings"* button, you can print the results to keep for your records.
Showering with a STANDARD FAUCET					Showering with a: SHOWER SMART FAUCET
Family Member (Name)	Shower time in minutes	Litres per shower	Showers per week	Litres per month	Shower time	Showers per week	Litres per month









Total Litres per Month:					Total Litres per Month:
Total Cost per Month:				$	Total Cost per Month:		$

Making Regional Changes There are 3 regional changes that you can make to refine your savings calculation.
The calculator has many "built-in" settings that represent average conditions. It is assumed that you have entered your family showering habits and have calculated the results. Now, for greater accuracy, you can change some of these "built-in" settings to reflect your particular family and regional conditions.
Please enter your cost of water.	$	The National average cost of water is $.0008 per liter. Check your water bill to see how much you are paying. You are probably paying by the cubic meter (1 cubic meter = 1000 liters). Figure out your cost per liter from your bill and enter it into the box. With a new cost of water entered in the box, go back to the calculator and click on *"Calculate your shower savings"*. Your new monthly savings will be recalculated.
Please enter your cost for heating shower water.	$	The calculator uses $.091 /kwh as the average cost of electricity. Look at your electric bill to see what your kwh charge is. Multiply by the "cost to heat one litre of water to average showering temperature" factor ( 0.0347 ) and enter the new value. With a new kwh amount entered in the box, go back to the calculator and click on *"Calculate your shower savings"*. Your new monthly savings will be recalculated. Usually the cost of other water heating methods (LNG, propane...) are close to the cost of electricity, when it comes to heating water. Use your local kwh price to approximate your other energy source costs.
Please enter your shower head flow rate for your existing shower.		The third regional change is your shower head flow rate. Low flow showers usually operate about 8.5 litres per minute (lpm). The national average for shower head flow rates is 10 lpm. if you know yours, or have measured it, enter the number in the above box. With a new flow rate amount entered in the box, go back to the calculator and click on *"Calculate your shower savings"*. Your new monthly savings will be recalculated.

If you change either the showering times or the showers per week of your family members, go back to the calculator and click on "Calculate your shower savings". Your new monthly savings will be recalculated.

Making Family Changes

Most family members know how long each of the others are in the shower. To get more accuracy, get out your stopwatch.

The number of times each family member showers per week can be estimated accurately. Can you get it more accurate?

If you change either the showering times or the showers per week of your family members, go back to the calculator and click on calculate. Your new monthly savings will be recalculated.

The SSF usage calculation, is more accurate than the existing showering usage calculation. The main reason for this is that your existing showerhead flow rate may be substantially different than the calculator average. The calculator uses a flow rate of 10 liters per minute as an average for your existing shower. All showerheads are different and all household water pressures are different so showerhead flow rates will all be different. If you want a more accurate flow rate on your existing shower, get out your bucket and stopwatch in order to measure your showerhead flow rate. With a new showerhead flow rate amount entered in the box, go back to the calculator and click on calculate. Your new monthly savings will be recalculated.

The general accuracy of the calculator and its' equations.

The heating of water is a well-known phenomenon. In fact, the British Thermal Unit (BTU) uses the heating of water as its' unit of energy measurement. One BTU = the amount of heat required to raise the temperature of one pound of water one degree Fahrenheit.

The SSF has been developed to measure it's own performance. (Yes, it can be done because of it's microprocessor) As such, the accuracy of the sensors and measuring circuitry meets laboratory standards with an inaccuracy of less than 1%. This means that family members that use up to the 50 liter limit will be using a precise amount of shower water. This means that the calculation of savings when using the SSF is quite accurate.

The calculator formula – Showering with a Standard Shower Faucet (Metric information displayed)

Time in shower X Shower flow rate = Water used per shower

Water used per shower X Number of showers per week X 4.3 = Total water used per Month

Total water used per Month (liters) X 30 degrees Centigrade temperature rise X .00116 kwh per liter- degree Centigrade X $.091per kwh = Total cost per Month

The calculator formula –Showering with the SSF

Time in shower X Average shower flow rate = Water used per shower

Average shower flow rate = 5.5 liters/minute (because of flow cycling)

If Time in shower X 5.5 liters/minute reaches the 50 liter limit, the shower will stop.

Time in shower at 5.5 liters/minute with the 50 liter limit = 9.0 minutes

Increasing the Time in shower means decreasing the Shower flow rate to keep to the 50 liter limit.

Example: If Time in shower = 15 minutes, the Average shower flow rate = 3.0 liters/minute, to keep the 50 liter limit



Water used per shower X Number of showers per week X 4.33 = Total water used per Month



Total water used per Month (liters) X 30 degrees Centigrade temperature rise X .00116 kwh per liter- degrees Centigrade X $.091 per kwh = Total cost per Month

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