I had a box and a CRT tv until last year,no cable,just antenna.
The remote went out,even with new batteries.I looked online to see if I could get a universal remote that would work with it.
This was around Christmas time,and I saw an ad for a flat screen,digital,LED tv for 119$.
The screen is at least 2x as large,but takes up less space and so much lighter.Don't need the box,and extra wires and cables
Don't have the exact numbers,but uses way less elec,and very little heat is produced.
I kept the converter..just in case..tv is gone.
I don't think it will be handy in SHTF for anything other than getting componets from it.