An automatic hot beverage preparation machine comprising a water source; a water boiler to heat water; a hot beverage dispensing assembly; and a hydraulic water supply circuit comprising a first branch to connect the water source and the water boiler, a second branch to connect the water boiler and the hot beverage dispensing assembly, at least a first electronically controllable valve device to selectively supply water in the second branch, and a water temperature sensor to measure water temperature at an outlet of the water boiler; the hydraulic water supply circuit further comprises a further branch to connect the first branch and the second branch; characterized in that the hydraulic water supply circuit further comprises a second electronically controllable valve device to selectively supply water in said further branch; the second branch comprises a water supply manifold arranged between the water boiler and the first and second valve devices (24, 29), wherein the first and second valve devices (24, 29) have respective water inlets connected to the water supply manifold; the dispensing assembly comprises a plurality of dispensing devices to dispense respective types of hot beverages; and the hydraulic water supply circuit comprises a plurality of said first valve devices, one for each dispensing device; the first valve devices are arranged adjacent one to another so as to form a compact valve assembly and have respective inlets connected in parallel to the water supply manifold and respective outlets connected to the respective dispensing devices; the first valve devices are physically joined together such that respective inner ducts define, as a whole, the water supply manifold; the second valve device is arranged downstream of the first valve devices in the direction along which hot water flows in the water supply manifold; the automatic hot beverage preparation machine further comprises an electronic control unit electrically connected to the water temperature sensor and to the first and second valve devices (24, 29), and configured to control the first and the second valve devices (24, 29) based on the water temperature at the outlet of the water boiler to cause, until the first and second valve devices (24, 29) reach a predetermined thermal regime, hot water to be prevented from being supplied to the hot beverage dispensing assembly through the second branch and the first valve device, but to be supplied to said further branch through the second valve device to heat the first and the second valve devices (24, 29) and bring them to said predetermined thermal regime. the hydraulic water supply circuit further comprises a further branch to connect the first branch and the second branch; characterized in that the hydraulic water supply circuit further comprises a second electronically controllable valve device to selectively supply water in said further branch; the second branch comprises a water supply manifold arranged between the water boiler and the first and second valve devices (24, 29), wherein the first and second valve devices (24, 29) have respective water inlets connected to the water supply manifold; the dispensing assembly comprises a plurality of dispensing devices to dispense respective types of hot beverages; and the hydraulic water supply circuit comprises a plurality of said first valve devices, one for each dispensing device; the first valve devices are arranged adjacent one to another so as to form a compact valve assembly and have respective inlets connected in parallel to the water supply manifold and respective outlets connected to the respective dispensing devices; the first valve devices are physically joined together such that respective inner ducts define, as a whole, the water supply manifold; the second valve device is arranged downstream of the first valve devices in the direction along which hot water flows in the water supply manifold; the automatic hot beverage preparation machine further comprises an electronic control unit electrically connected to the water temperature sensor and to the first and second valve devices (24, 29), and configured to control the first and the second valve devices (24, 29) based on the water temperature at the outlet of the water boiler to cause, until the first and second valve devices (24, 29) reach a predetermined thermal regime, hot water to be prevented from being supplied to the hot beverage dispensing assembly through the second branch and the first valve device, but to be supplied to said further branch through the second valve device to heat the first and the second valve devices (24, 29) and bring them to said predetermined thermal regime.