The COP of the Brillouin reactor is now been verified to be under 1.5... nearly useless. If I remember correctly, MFMP produced over unity heat in some of their experiments but not very much. The same low COP issue arose in the Lugano demo. Low COP is a big problem for LENR. Most of the energy produced by LENR comes in the form of sub atomic particle generation which includes huge numbers of neutrinos. In the LENR reaction, the heat is provided by a minor energy channel involving hawking radiation. The Brillouin reactor is most likely pumping out a ton of sub atomic particles as seen in the experiments of Holmlid. Those particles need to be converted to heat. Therefore, the heat rich LENR reactor should be surrounded by a blanket of molten lead or thorium salt to capture muons that will catalyze muon fission. But this type of fission will produce a ton of neutrons similar to a hot fusion reactor. The dream of a LENR reactor in your basement might well be impossible unless Rossi has found a way to increase the proportion of the reaction energy to be radiated in the form of heat.
To verify if this opinion is well founded, a LENR reactor should be surrounded in lead blocks up to a foot thick. We should see a large flux of neutrons produced by the lead.