Answers

2015-07-30T18:01:00+05:30
Uses:

It will hot the water very fastly

effects:

It has carbon monoxide

It consumes more power
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warm, not hot, geyser doesnt have CO, it works on electricity and there are ones which consume less power
the 2 L ones, I mean
2015-07-30T18:09:37+05:30
I hope you mean electric ones

It is used to warm water for a variety of purposes

The big ones waste a lot of electricity due to resistance offered by heating element
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