FIELD: measurement technology. SUBSTANCE: device has two temperature transducers (1,2) for measuring the temperature of heating appliance and of room air, respectively, set-point device (3) of-heating appliance surface area made as variable resistor, amplifier (4), heat exchanger coefficient calculation unit (5), and signal processing and indicating unit (6). Unit 5 is made as solving amplifier which realizes independence L = f(Δt). EFFECT: higher measurement results. 2 dwg
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