Using barrels of water to heat a greenhouse | The Survival Gardener

It’s amazing how well this works:

It’s not enough to get you through a Northern winter, but it would extend the season quite a bit. Here in Lower Alabama, it’s often enough to avoid having to use an electric or gas heater.

We’re up to about 40 barrels now. I think that’s enough, but there are sometimes freak cold events that may stretch this method beyond its capacity. We’ll make sure we have a backup just in case, but so far, so good. It handles the upper 20’s just fine.

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