You need mass for solar heat storage, not just a heat absorbtitve (black)
color, and you need exposure to heat such as direct sun (the more the better)
to heat the mass. I don't know of where you can get square black containers,
but you could spray paint black any stackable container and fill it with
water. Dark stone (slate, dark marble/granite for example, the thicker the
better), is also good for solar heat storage. You can often find both at yard
sales or get blemished pieces cheap from stonemasons.
I am close to enclosing my greenhouse and would like to obtain some
> square plastic containers perferably black that can be stacked against
> the back wall to function as thermal mass for solar heat storage.
> Anyone know of a source where I might get them - possibly as throw
> aways. I would need a source in or reasonably near western Pennsylvania.
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