On Mar 11, 10:00*pm, (Doug Miller) wrote:
In article , harry wrote:

You are showing your ignorance here. *The temperature of steam depends
on it's pressure. *That pressure can be above or below atmospheric
pressure. *If it is sub-atmospheric the temperature can be as low as
120degF. If it is at amospheric pressure the temperature is 212degF.
The upper limit can be as high as you like.

How many steam heating systems are you aware of that operate at, or below,
atmospheric pressure? Please cite specific examples.

I ran a huge sytem personally before I retired. Steam raised was used
to generate electricity. The exhaust steam from the turbines was used
for heating with direct steam radiators. The pressure in them was 0.6
bar (absolute) ie -8psi in your parlance.