Water heater inlet valve? Pic included

[David Nasser]

the water in the house had slow flow on the hot side....cold side flow was
ok. Is this due to the valve being cut off ?

[Wayne B. Wilson]

most likely

[Joe Funderburk, CMI]

I'm surprised it had any flow.

[James F. McKee]

that would sure do it

[Wayne B. Wilson]

If there was flow the valve in Question had to be defective or there be a problem else where.

[Frank P. Newman]

Looking closely at the picture, it appears that the ball valve may be 'cracked' open just a bit which would account for th every low flow. If I saw that in inspection, I would definitely open it some more to find out!

[Bob Elliott]

I would not open the shutoff as it is closed for a reason.
I observe it also has Galvanized piping which has a tendency to close up over time.