So, the material to be used for tubing, storing, heating, injection pump and injector itself has to be a very exotic one, don't you think? Exotic it is, but not very unusual too. Titanium alloy. Get a hint from this PDF listing a lot of novel alloys that might provide good pricing with extra properties.

And now a webpage of the century, electric energy generators which work by simply sucking warm and cold seawater. Welcome to the OTEC - but this is allowed by use of modified Rankine thermal cycle, the Uehara-Rankine cycle. Why is this so important? It allows energy recovery from heat surces with only 10 deg. difference! That is the waste heat unusable for anything else. The main difference between this project and many others is that this one works as a demo and 1MWe ship-borne facility is nearing its completion in India. To tell the truth, I was impressed that India plans to deploy one THOUSAND these facilities at 50MW each! The by-product of this system is distilled water - surely a very valuable commodity, since the only investment during use is maintenance and protection. Believe it or not, but UAE (emirates) are interested in a ship like that, but which only produces drinkable water, not electricity. The budget was ~250milion dollars for version with electric output. REPORT HERE.