A method of monitoring heat consumption using a plurality of heat submetering devices distributed in a plurality of individual heat consumption arrangements supplied with a heating medium by a common heat supply, said plurality of heat submetering devices comprising heat cost allocator sub-meters mounted on a plurality of heat consumption devices and being communicatively associated with a meter reading system, the method comprising: receiving in said meter reading system one or more measured meter readings at a first acquisition time, each of said one or more measured meter readings corresponding to a respective heat submetering device of a received devices group of said plurality of heat submetering devices; transmitting one or more meter readings to a heat monitoring system at a first transmission time later than said first acquisition time, at least one of said meter readings comprising a representation of one of said one or more received measured meter readings; monitoring in said heat monitoring system heat consumption values corresponding to one or more of said plurality of heat consumption arrangements, said heat consumption values being calculated in a first calculation step for a monitoring period on the basis of an energy consumption derived from said common heat supply and meter readings corresponding to each of said plurality of heat submetering devices, said energy consumption and said meter readings being associated with said monitoring period, wherein said meter readings comprise estimated meter readings corresponding to heat submetering devices of a non-received devices group of said plurality of heat submetering devices and said at least one of said meter readings comprising said representation of one of said one or more measured meter readings transmitted at said first transmission time; providing in said meter reading system at a second acquisition time after said first transmission time one or more meter readings corresponding to one or more heat submetering devices of said non-received devices group, said meter readings being associated with said monitoring period; transmitting one or more updated meter readings to said heat monitoring system at a second transmission time later than said first transmission time, wherein each updated meter reading comprises one of said one or more meter readings provided in said meter reading system at said second acquisition time; and re-calculating in said heat monitoring system in a second calculation step heat consumption values corresponding to one or more of said plurality of heat consumption arrangements for said monitoring period on the basis of said energy consumption and meter readings corresponding to each of said plurality of heat submetering devices, said meter readings being associated with said monitoring period, wherein said meter readings comprise at least said meter readings transmitted at said first transmission time and said updated meter readings transmitted at said second transmission time. receiving in said meter reading system one or more measured meter readings at a first acquisition time, each of said one or more measured meter readings corresponding to a respective heat submetering device of a received devices group of said plurality of heat submetering devices; transmitting one or more meter readings to a heat monitoring system at a first transmission time later than said first acquisition time, at least one of said meter readings comprising a representation of one of said one or more received measured meter readings; monitoring in said heat monitoring system heat consumption values corresponding to one or more of said plurality of heat consumption arrangements, said heat consumption values being calculated in a first calculation step for a monitoring period on the basis of an energy consumption derived from said common heat supply and meter readings corresponding to each of said plurality of heat submetering devices, said energy consumption and said meter readings being associated with said monitoring period, wherein said meter readings comprise estimated meter readings corresponding to heat submetering devices of a non-received devices group of said plurality of heat submetering devices and said at least one of said meter readings comprising said representation of one of said one or more measured meter readings transmitted at said first transmission time; providing in said meter reading system at a second acquisition time after said first transmission time one or more meter readings corresponding to one or more heat submetering devices of said non-received devices group, said meter readings being associated with said monitoring period; transmitting one or more updated meter readings to said heat monitoring system at a second transmission time later than said first transmission time, wherein each updated meter reading comprises one of said one or more meter readings provided in said meter reading system at said second acquisition time; and re-calculating in said heat monitoring system in a second calculation step heat consumption values corresponding to one or more of said plurality of heat consumption arrangements for said monitoring period on the basis of said energy consumption and meter readings corresponding to each of said plurality of heat submetering devices, said meter readings being associated with said monitoring period, wherein said meter readings comprise at least said meter readings transmitted at said first transmission time and said updated meter readings transmitted at said second transmission time.