If you are using the word costs as a noun, then it is plural. You would say the costs are..., never the costs is.... If you are using it as a verb, then it refers to a singular object: It costs a lot of money They cost a lot of money.
The average solar water heating system can cost between $6,300 and $7,200 depending on the tank size and need.We help to make getting a solar water heating system installed in your home both easy and affordable.We provide two rebates to help you offset costs:he Cost of a Solar Water Heating System. The average solar water heating system can cost between $6,300 and $7,200 depending on the tank size and need. We help to make getting a solar water heating system installed in your home both easy and affordable. We provide two rebates to help you offset costs:
To estimate the annual operating cost of a solar water heating system, you need the following: 1  The system's solar energy factor (SEF). 2  The auxiliary tank fuel type (gas or electric) and costs (your local utility can provide current rates).n average, if you install a solar water heater, your water heating bills should drop 50%â80%. Also, because the sun is free, you're protected from future fuel shortages and price hikes. If you're building a new home or refinancing, the economics are even more attractive.