CALCULATING ANNUAL OPERATING COST
Before purchasing a solar water heating system, estimate the annual operating costs and compare several systems. This will help you determine the energy savings and payback period of investing in a more energy-efficient system, which will probably have a higher purchase price.
Before you can choose and compare the costs of various systems, you need to know the system size required for your home.
To estimate the annual operating cost of a solar water heating system, you need the following:
- The cost of a solar water heating system
- The auxiliary tank fuel type (instant heater or storage heater) and costs (your local utility can provide current rates).
Then, use the following calculations.
Here is a typical comparison in between instant heater and solar water heater.
|Number of instant heaters||: 4|
|Cost per instant heater||: 350|
|Installation cost||: 150|
|Cost of Purchase||: 4 x (350 + 150) = RM2000|
|Number of persons||: 6|
|Number of showers per day||: 2 per person|
|Average time per shower (min)||: 15|
|Heating element rating||: 3.3kW|
|Electricity tariff||: 0.276kW/Hr|
|Monthly Cost||: 6 x 2 x (15/60) hour x 3.3 x 0.276 x 30 days = RM81.97|
|Yearly Cost||: RM81.97 x 12 months = RM983.64|
|AQUASOLAR L66 Heater|
|Cost per solar water heater||: 5250|
|Installation cost||: 0|
|Cost of Purchase||: RM 5250|
|Return On Investment (ROI)||: 5250 – 2000 = 3.3 years|
Ask an Expert.
The best way to find out how much it will cost is to book a Free In Home Solar Quote. Our BWS Expert will recommend the best system for you and provide an obligation free quote.