Water Heating Energy Efficiency Calculator

To start calculating your energy savings, you’ll need to have your Energy Efficiency Checklist handy.

If you haven’t filled out a checklist yet, start by printing out the Energy Efficiency Checklist.pdf. Once you’ve filled in all the relevant details from your dairy shed, pop back to this site and enter the details into the calculator.

Completed your checklist already? Then you’re ready to transfer your details into the calculator. We’ve entered some default numbers to guide you, so all you need to do is replace these with your own accurate information and the calculator will do the rest for you.

Don’t forget to save! When you’re finished, click ‘save information’ and you’ll be able to review your information at any time.

Handy hint. When it comes to entering your farm and electricity account inputs you might find it helpful to look at our sample bill, which highlights the information you need to look for.

Number of cows being milked
Milking days per year
Day/Night metering	NoYes
If yes for day/night, percentage of night use	%
Do you have a specific Hot Water/Control meter	NoYes
Anytime/General tariff	cents/kWh
Day tariff	cents/kWh
Night tariff	cents/kWh
Hot Water/Control tariff	cents/kWh
Prompt payment discount applicable	0% 5% 10% 15% 20%

Equipment wash - hot water volume per wash	litres gallons
Number of equipment washes per week
Vat wash - hot water volume per wash	litres gallons
Number of vat washes per week
Hot water temperature in cylinder	(ºC)
Average water supply temperature to cylinders	(ºC)
Refrigerant in milk refrigeration unit	R12 R22 R123 R125 R134a R404a R410a R502 Other
Output water temperature from pre-cooler	(ºC)
Milk cooling refrigeration motor size	kW hp

Required rate of return (post tax, nominal)*	%
Marginal tax rate	%
Select electricity price change year 2 (your estimate)	0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% %
Select electricity price change year 3 (your estimate)	0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% %
Select electricity price change year 4 (your estimate)	0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% %
Select electricity price change year 5 -10 (your estimate)	0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% %