No Water in Hot Water Taps

[Bill and Ann]

I turn the taps on and no water comes out of the hot water taps. There isn't any water coming out of the lower drain pipe either.
Fact:
The bi-pass is not turned off.
There was hot water for our showers this am.
There is water coming out of the relief valve outside when pressed.
The water dribbles out of the hot water taps when turned on full.

So far I have:
Taken the plug out of the bottom of the water heater and rinsed all the anode filings out. Still no water coming out of taps.

My thoughts:
There is a blockage in the line coming out of the hot water tank at the outlet at the top of the water heater.

My thoughts on possible solution:
Drain the water heater by taking out the plug at the bottom of the water heater. (anode)
Put air pressure through line from the low lever line under the rig and possibly blow whatever is blocking the line back into the water heater.

Any other suggestions are welcome