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Questions 

• Which solar water heater background works best, black or white?

• Will the temperature of the water increase more if I cover the heater with a lid?

 
Hypothesis

If I put water in a black, uncovered solar heater, then the temperature will increase the most.

Results 

The covered black solar water heater increased the temperature of the water the most.

Conclusion

A covered black solar water heater will increase temperature the most.

Changes

We should try a bigger solar water heater next time, and we could try tilting it towards the sun so it could get direct sunlight.

New Questions 

• Does the amount of water you put in the heater effect the increase in temperature?
• Will bigger solar water heater increase the temperature more than a smaller solar water heater?