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Default solar vacuum tubes overheat - steam engine

I've bought some solar vacuum tubes cheap (without instruction) (perhaps
navitron)

someone says if i put the hot water tank higher than them
then i wont need pumps.

But what happens when the hot water tank is at 99 degrees
at noon on a hot august day.

where does the excess heat go?

does it get hotter and hotter until the solder melts?

or can the vacuum tubes get super hot?

or can i harness the excess heat in a steam engine and get electricity?...

[g]
 
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