Lead flashing is still in use for roofing elsewhere in the EU. Most of the builders yards near me have rolls of it.
11 karma · joined November 25, 2015
So for use with your telescope, it'd need to produce an image circle that'd cover at least 6cm.
The tanks generally also have a heat exchanger within that's hooked up to the wet central heating system, that way you can have 1 boiler so both central heating and water heating.