Tanja Sieger wrote:Thanks John but I don't need the water for insultaion as it is an interior wall in a really well insulatet strawbale house. Water is aparently the best thermal mass you can find. Therefore I wanted to use the filled bottles as a termal mass inside a wall that receives sunlight during the day in order to help us heat the house.
Glenn Herbert wrote:The one serious issue I see would be expansion. If sealed, when the water heats up it will try to expand a small amount, and glass bottles have no give. A bit of airspace in each bottle might work to allow water expansion, or it might not... you would have to experiment to find out.