Hot water cylinder load bearing platform advice

Greetings Permies.

I'm building a non-loadbearing straw bale house. I have a 500L hot water cylinder which needs to sit above a wetback wood stove. I have earth floors and concrete strip footings. The internal wall against which the hot water cylinder will sit is made from 6x2. The question: Does anyone have any guides or ideas as to how to gauge how strong to make the framing for the hot water cylinder? Because it is an earth floor, I was planning on building the platform across a corner so that the weight will bear against concrete in two parts but not on the earthen floor. I was also planning to brace diagonally down to the corner of the concrete footing. I also have the option securing up to the roof framing as well.

I'd be grateful for any pointers.

The fact you were planning to install a 600kg tank and water in the roof, should have been taken into account when the design was being done.
A bit more detail of the framing is required to help you.
A sketch would be great.
Attaching it to the roof would be unwise in my opinion.
Also this is not clear?

The internal wall against which the hot water cylinder will sit is made from 6x2.  

Thanks, I think I've sorted it satisfactorily.