NOVELTY - Burning hydrogen in a burner includes mixing hydrogen and air to provide a combustible mixture, supplying the mixture to the burner on a catalyzer to start combustion by reacting the mixture and catalyzer, and burning the hydrogen at low temperature without forming flames.    USE - For burning hydrogen for generating heat.    ADVANTAGE - The inventive method can be operated under safe conditions, with very high efficiency and easy adjustment.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (a) a burner for carrying out the above method, comprising a burner vessel (2) including a hydrogen combustion chamber (3) holding a catalyzer (4) and encompassed by a thermal exchange chamber (6) holding a tube nest (7) for conveying hot burnt gases and allowing passage of cooling water or water to be heated, where an adjustable low-pressure air and hydrogen mixture is supplied on an inlet side (12) of the combustion chamber, hydrogen combustion is performed in the combustion chamber at low temperature and without flames by contacting the catalyzer, converging mechanisms for conveying the burnt gases from the combustion chamber to the tube nest are provided on a burnt gas outlet side (17), a burnt gas collecting and discharging chamber (18) is provided, and the thermal exchange chamber comprises a cooling water inlet (9), a cooling water outlet (11), and a condensate outlet (10);    (b) a heating system for heating water, comprising a burner; a low-pressure hydrogen supplying circuit including a flow meter for adjusting hydrogen flow rate, a display gauge for displaying the hydrogen pressure, a flow-rate measurement device, a further display gauge for displaying the pressure in a mixing chamber (14), and a thermometer for measuring the temperature in the mixing chamber or at the inlet side of combustion chamber; and a cooling water or water to be heated supplying system including a recirculating pump on the inlet side, a calorie counter on the outlet side, hot water accumulator(s), and an expansion tank, wherein the hydrogen supplying circuit and water supplying system optionally comprise shut-off and/or adjusting and/or discharging components like those conventionally used in hydraulic and gas delivery circuits; and    (c) a system for producing heat water heated by a burner, comprising an electric power producing stage for producing electric power for renewable sources, a buffer battery stage, a hydrogen producing stage for producing hydrogen by electrolysis, a hydrogen accumulating stage, a burning stage for burning hydrogen, and a cooling water and water to be heated storing stage.    DESCRIPTION OF DRAWING(S) - The figure shows a burner.    Burner vessel (2)    Combustion chamber (3)    Catalyzer (4)    Thermal exchange chamber (6)    Tube nest (7)    Exhaust gas outlet (8)    Cooling water inlet (9)    Condensate outlet (10)    Cooling water outlet (11)    Inlet side of combustion chamber (12)    Fan (13)    Mixing chamber (14)    Hydrogen inlet (16)    Burnt gas outlet side (17)    Burnt gas collecting and discharging chamber (18)