Garage Floor Heating / GHP

I'm planning on building a home in the not too distant future and would like to heat the attached garage. I'm also planning on going with a geothermal heat pump to cut back on utility costs. One of the selling points of the heat pumps is "free" hot water. My question is this: Would a GHP of the size needed to heat/cool the house produce enough extra hot water to keep a 2 car garage floor heated in the winter via piping runs in the cement, or would I have to upsize the GHP unit to handle both chores? Thanks for any input!
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You get "free" hot water in the cooling months, not during the heating months! You will need to size the equipment according to the cooling/heating load, so if you want to heat the garage you will need a larger, or a second heat pump. Greg
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You need a qualifed person to do a load calculation, slab on grade garage will be alot of extra heat needed. I had a basement floor put in and used foamboard under the concrete for insulation , it is common for radiant, I dont know how well it would work in a garage but you will be transfering in alot of cold from the ground, loosing alot of heat.
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Of course you have to upsize if the original pump is designed just for the house. Look at insulating the floor or you will have to upgrade quite a bit.
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