Boiler for heating water in coffee machines

1. A boiler for heating water in coffee and espresso machines, comprising a boiler housing, a cold water inlet and a hot water outlet, as well as an electrical heating device projecting inside the boiler housing, wherein the boiler housing has a cylindrical shape with a boiler shell, a boiler cover and a boiler base with a cylinder axis that is directed horizontally when in use, the cold water inlet duct and the hot water outlet and the electrical heating device are mounted on a vertically extending boiler base of the boiler housing, and the heating device is configured so that each point inside the volume of the boiler shell is at a normal distance from the heating device that is less than 40% of the diameter of the boiler shell.

2. The boiler as claimed in claim 1 , wherein the heating device is made of a tubular heating body, which tubular heating body comprises six sections that extend parallel to the cylinder axis of the boiler and are at a normal distance of about one third of the internal diameter of the boiler shell from both the adjacent parallel sections and the axis, and in that each such section has a length that exceeds 70% of the longitudinal extension of the boiler housing.

3. The boiler as claimed in claim 1 , wherein the tubular heating body is fastened to the boiler base so that the end sections are arranged on top and extend parallel to the cylinder axis in the boiler housing, and the electrical connection of the tubular heating body is brought insulated to the outside through such fastening.

4. The boiler as claimed in claim 1 , wherein the cold water inlet duct is arranged in the lower part of the vertically extending boiler base and the hot water outlet is arranged in the upper part of the boiler base.

5. The boiler as claimed in claim 1 , wherein a temperature sensor, projecting inside the boiler housing, is arranged on the boiler base in the region of the hot water outlet.

6. The boiler as claimed in claim 1 , wherein the connections for the cold water and the hot water are pluggable.

7. The boiler as claimed in claim 5 , wherein the temperature sensor is pluggable.

8. The boiler as claimed in claim 1 , wherein at least one thermal protection switch is arranged on the boiler housing.

9. The boiler as claimed in claim 1 , wherein the boiler housing is sheathed with a thermally insulating layer.

10. The boiler as claimed in claim 1 , wherein the boiler housing is made of plastics.

11. A boiler for heating water in coffee and espresso machines, comprising:

a boiler housing;

a cold water inlet;

a hot water outlet; and

an electrical heating device comprising a tubular heating body with several sections projecting inside the boiler housing;

the boiler housing comprises a boiler shell defining a generally cylindrical volume having a diameter and a cylinder axis, a boiler cover and a boiler base;

the cold water inlet and the hot water outlet are located in the boiler base and the electrical heating device is mounted on the boiler base; and

a distance d between each point inside the volume of the boiler shell and a closest surface of the tubular heating body is not greater than 40% of the diameter of the volume.

12. The boiler according to claim 11 , configured to be mounted with the cylinder axis horizontally oriented when the boiler housing is in use.