I designed solar thermal collector (Flat plate) for a DHW system in a building

I put only one Thermal Collector as a tryout and i want to ask this

The heat in GJ is the heat that is produced by the solar thermal collector, but what does this 100% percent heat refers to?

What does 100% mean in this table? please see the attached photo

Thank you

I designed solar thermal collector (Flat plate) for a DHW system in a building

I put only one Thermal Collector as a tryout and i want to ask this

The heat in GJ is the heat that is produced by the solar thermal collector, but what does this 100% percent heat refers to?

What does 100% mean in this table? please see the attached photo

Thank you