The 24 hour test is reportedly being conducted by a US company Rossi has contracted with. If the test is successful it sounds like it will then move to some sort of production for deployment.
After a lengthy recap of the debate that has surrounded Rossi's work the Wired article has this to say about todays test:
"And that's the important thing about the 28 October test: for the first time it will be carried out by the customer's consultants, not by Rossi himself. The customer, apparently a large US company which has declined to be identified, will be measuring for itself whether the E-Cat does what it says before it will pay for it. Rossi has claimed that the device will output six times as much energy as it consumes. If it fails to perform, Rossi will not get paid and the customer will doubtless remain anonymous to avoid the inevitable bad publicity. If it succeeds, the customer might reveal itself to take credit for financing the biggest breakthrough in energy production of the modern era.
"There is a lot at stake for Rossi personally. He has reportedly sold his house in order to fund development work, and has been working 16- or 18-hour days for the last few months to get everything ready for the demonstration. The exact design has changed repeatedly; originally the one-megawatt generator was to be composed of three hundred small E-Cats, then it was 52 larger "fat cats", now the number seems to be 43.
"... a home E-Cat, a cube measuring 40 centimetres a side, which will produce all the heating and hot water you want. (Think "Mr Fusion" Home Energy Reactor in Back To The Future). His target cost is 500 euros per kilowatt, so replacing a typical boiler with an E-Cat would cost about £6,000 -- but you could then leave the heating on 24/7 and never see a fuel bill again. Rossi claims it could be on the market within months, though one suspects that there might be regulatory issues with people have nuclear reactors in the homes."http://www.wired.co.uk/news/archive/2011-10/28/cold-fusion?page=all