Heat recovery from car radiator.

[Artman]

You'll smoke yourself out with exhaust fumes, and while you'll heat the garage, you won't heat the house effectively, or be able to heat water.

Brewnog, then the OP needs to reword his post. He said waste heat. That implies the primary use of the engine is something other than this form of heating. I took this to mean he was placing his car with a hot engine from driving it in the garage and turning it off. Then trying to capture the waste heat from the engine as it cools, which could be done simply as I said, by insulating the garage. This will give the house as much benefit as trying to transfer the heat to the house through a water piping system, without the difficulty of rigging up a radiator, transfer piping, pumps, etc.

Trying to see if it is viable to capture waste heat from radiator of cars(s) to pre-heat water heater and or radiant floor.

 

[Plastic Photon]

Are thermocouples in the engine attached to a space heater out of the question?