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If the powder is the consistency of talcum it is probably composed mainly of calcium and/or magnesium carbonates (limestone and dolomite)formed when their corresponding bicarbonates are heated in the water heater. The other product is CO2. The bicarbonates are soluble in water but the carbonates are not and they precipitate out as a fine white powder. If brought to a boil in a coffee maker, kettle etc they can form a hard scale. My experience is with boilers so I am not sure of the appropriate solution for a small water heater if any is actually needed. If you want to check water hardness take a sample to a water softener dealer and he can test it for you. He might also be able to suggest solutions if you are concerned.
Doh! You said crystals. That sounds like silica. Check your screens in the taps.
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