If you are lucky and in great shape your exercise bike will put out 200 watts, but if you are riding for more then just a few minutes then figure 100 watts if you are an average American, that is the same kind of heat as a 100 watt light bulb will put out.
To give you an example of energy used to heat water, my electric tea kettle is one of the most efficient ways to heat a small amount of water using half the energy it takes to heat the same amount of water in a microwave, so it takes about 50 watt hours to bring 4 cups of water to a boil, that would be ridding your stationary bicycle for half an hour to heat enough water to wash up in the sink.
At the same time you could lay a black garden hose out in your drive way and have a small pump from an RV to circulate the water in it in to the kiddie pool and end up with a nice warm kiddie pool by mid afternoon.
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