A domestic combined heat and power system including a power unit, a heat-storage tank which receives waste heat of the power unit for storing heat in direct water, and a main heat exchanger connected to the heat-storage tank, being heated by a burner so as to use the water as hot water. The sensor system includes an imaging sensor operable to image light of the two different spectral bands, a common optics having at least one reflective or refractive optical element, and a wavelength-selective beamsplitter on the light path between the target and the imaging sensor. The substrate comprises a luminescent surface and a non-luminescent surface. The wireless interface module can establish one or more wireless links with one or more peer EIR terminals, to join a wireless network which is collectively formed by the peer EIR terminals.