that is some damn hot water...
are you sure it is that hot???.
Is this a glycol system or some sort of potable water type????
is this some sort of home --made system,
or soemthing professionally installed??
My guess is you probably have a bad sensor at the waterheater or on the panels
or possibly in the differential controller cause
it should only come on enough to heat the water maybe to 140, not to
allow it literally boil the water in the heater...
it is not suppose to literally keep running till the system starts to boil,
it is only supposed to get so hot in a normal safe range and then shut off..
200 degree water at what facuets???
You must be talking about the boiler drains on your solar system??
You dont mean faucets in your home, correct?? That would be so hot that it
would literally warp the washers in a Delta faucet...
JOE you really, really need to be careful with something
that is literally close to or at boiling..
I suggest you shut it off for your safety and your family.
at that temp it would only take a micro second to be going
to the hospital for massive scald damage
you need to call some professional out to look over this system before
someone gets hurt....