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#Solar water heaters can be a cost-effective way to generate hot water for your home. They can be used in any climate, and the fuel they use -- sunshine -- is free. Passive solar water heating systems are typically less expensive, more reliable and may last longer than active solar water heating systems.

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from About.com Home

Anatomy of a Tank Type Gas Water Heater

from Instructables.com

Solar Thermal Water Heater For Less Than Five Dollars

Save #Money With Home Improvement- Want to save a bit of money on your #heating bills? Install a timed thermostat for your water heater. This will turn the heater off after a certain time when you wouldn’t be using the water any longer, then turns it back on before you will need the warm water again.

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switch to a tankless water heater: the American market is starting to come around to the idea of efficient tankless water heaters (a standard in Europe and Asia), there seem...