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Propane Boiler steam usage ideas

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We've recently purchased a house with hot water baseboard heating. The heat is provided via propane with the warm steam from the boiler being piped outside. Even though they say propane burns clean we have plans to transition to clean, green energy (solar, wind, and hydro are all options for us). However until that time I can't help but see this warm steam being piped outside as an incredibly wasteful use of energy. I don't want the moisture inside the house but there's gotta be a way to utilize this resource. While writing this I thought of a seed starting greenhouse, any other creative ideas? Thanks!
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Location: West Tennessee
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Hi Gray, welcome to Permies.

Have you considered a simple condenser coil to recover this steam? It could be collected in something like a rain barrel resulting in a quantity of your own steam distilled water.
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Location: Southern Illinois
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Energy is one of those areas in which I feel well qualified to answer, but to get the best answer I need a little bit more information.  Where do you live and what are your average temperatures and humidity like?  Can you give me any idea on the temperature of the steam outside?  Even if you can give me just a rough idea like it is warm, cool, etc.  The reason I ask these is that it is possible that your system is quite efficiently transferring heat from the steam to your floors (and heated floors feel wonderful by the way).  If this is the case, then it is possible that the real waste here is not energy but water, but this is highly dependent upon the climate and your temperatures and humidity.  How common/scarce is water in your region?  When I dry my clothes in the dryer (not very Permie--I know) I see "steam" coming from my dryer vent, but I know that this is not truly steam but condensation and it is most visible on humid days.  

For heating purposed, there are advantages to propane.  As long as you are not counting CO2, it does indeed burn clean.  It can be turned on and off and this factor alone makes its use relatively frugal.  If you are counting CO2 emissions, then for reasons of complexity, I will answer this in another post.  

On the other hand, water may be the resource that is being most wasted, and as James pointed out, it would not be too difficult to create a little condenser coil to recover distilled water.  Using the steam in a greenhouse is a perfectly valid idea, but only if you really have ambitions to use that green house.  Otherwise it will become an expensive, excessively humid place that will likely need repair and is full of mold--thanks to all of that steam.

I can go on, but this is a start.  Give me a bit more information and I can be more precise.

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Location: North central Ontario
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I'm confused. Is your boiler not a closed unit?
the pipe that goes outside is usually the exhaust from the burning of the propane. There will be some water vapor in it as a normal byproduct of combustion. A modest amount of heat is in the exhaust to allow that vapor to not condense until it's out of the pipe. There is no reason you could not pipe it to a small seed starting greenhouse. It will be very humid and rich in CO2  . There is a safe distance a furnace exhaust stack can travel so don't over do it and it will of course give your insurance company fits...
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