Patent ID: 9423151
Filing Date: 2016-08-23
CPC Classification: F24H,H05B

Claim Text:
1. A heating system to heat a main heating circulation, said heating system comprising: an electric heater adapted to heat a primary heating liquid by applying an electric current directly to said primary heating liquid; a control head adapted to determine a temperature and a pressure of said primary heating liquid; a heat exchanger with a first liquid passage for said primary heating liquid and a second liquid passage for a secondary heating liquid in said main heating circulation, said second liquid passage being in thermal contact with said first liquid passage to heat said secondary heating liquid while cooling said primary heating liquid; a pump; and a plurality of tubes connecting said electric heater, said control head, said heat exchanger and said pump defining a circulation for said primary heating liquid, wherein said pump is adapted to pump said primary heating liquid such that heat is transferred from said heater via said heat exchanger into said main heating circulation, wherein said electric heater is connectable to a power supply comprising at least two power lines and said primary heating liquid flows through said electric heater along a flow path, said electric heater further comprising: a central electrode connected to a central electrode terminal; and a cylindrical outer electrode connected to an outer electrode terminal, and wherein said central electrode and said cylindrical outer electrode are separated by said flow path in a coaxial arrangement such that an electric current flows between the central electrode and said cylindrical outer electrode when said at least two power lines are connected to said central electrode terminal and to said outer electrode terminal.