Fix grammaticality of the sentence: Hence, the high one-time economic input does not seem to be a problem compared with the high efficiency and the significant side product of the VHTR system.
The high-efficiency of the VHTR system is a result of the high-efficiency of the high-efficiency of the VHTR system.
The VHTR system is a high-efficiency system, but the VHTR system is a high-efficiency system.
The VHTR system is a high-efficiency system, but the VHTR system is a high-efficiency system.
The VHTR system is a high-efficiency system, but the VHTR
The high-efficiency and high-productivity of the VHTR system is a result of the high-efficiency of the VHTR system.

• I think the above is a bit of a stretch. The VHTR system is a very efficient and high-efficiency system, but the high-efficiency is not the only reason why it is a good system.

• The VHTR system is a very efficient and high-efficiency system, but the high-efficiency is