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3 cards from this section. Quick, good the night before a test.
What is the purpose of a solar water heater?
Think about how sunlight relates to heating.
What color are the tubes in a solar water heater usually?
Consider which colors are best for absorbing heat.
What is the primary function of a solar water heater?
Think about what heating does to water.
True or False: Solar water heaters require electricity to operate.
Consider the energy source for heating in this scenario.
If a solar water heater saves a family 1200 kWh a year and they use this energy savings to power an electric heater for 4 hours a day, calculate how many additional kWh would be used by the electric heater in that time over a year. Assume the electric heater uses 2 kWh per hour.
Consider how to multiply the usage per hour by daily and yearly duration.
Assuming that the cost of installing a solar water heater is $1500, calculate how long it will take for it to pay for itself with an annual saving of $144. What if energy prices increase by 10% annually?
Think about how yearly savings accumulate over time and consider justifying increased costs.
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