[Strawbale] 2L Bottles as heat sink

[Speireag Alden]

On 2007, Dec 29, at 21:02, Donna Soroka wrote:

> I've read it recommended in several places to use 2L bottles filled  
> with water (usually in the attic) to collect  and store heat.  Does  
> anyone know how long these bottles should be expected to last  
> before exchanging them for "fresher" bottles?

     Indefinitely, I'd say.  I've seen bottles floating in a pond  
last for years, and these won't be exposed to ultraviolet.

> I'd really hate to have a big mess because a few of the bottles  
> broke / wore out / disintegrated / etc.  Thanks. Donna.

     You wouldn't have a big mess.  First, they're almost certain to  
fail one at a time.  Second, they're not going to fail  
catastrophically; even a pinhole leak will leak very slowly, and  
evaporate as it does.  The only way you'll know that they failed is  
when you inspect one and find it less than full.

-Speireag.