I was thinking that if you had one of those wall-mounted
instant hot water heaters in your house, you could string
together a set of salvaged heater cores or a radiator or two,
run a hose out there from a hot-water outlet in the house
(need some adapters for all this to get the appropriate
sizes for the garden hose, and pile something around the
hose to keeping it from losing any significant amount of
the heat on the way), and just turn the water on at night.
You can put a short hose on the other end and let the water
drain to some innocuous part of the garden.
No fan, so only convection would move the warm air
around the greenhouse.
Not that this sounds more practical than other methods,
and if your power goes out, the instant water heater
goes out with it. No CO, though.
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