As an electric energy alternative technology, regenerative electric heating will affect the safe operation of the distribution network in the process of application, with people’s attention to distributed energy resources and the development of electric heating related technologies, the research of electric heating is becoming more and more important. In order to fully exploit the adjustable potential of regenerative electric heating in the distribution network, the analysis is carried out from the two levels of regenerative electric heating unit and cluster. Firstly, the quantitative indicator of adjustable potential is proposed, including capacity, charge and discharge power, energy storage status, up-regulation capacity and down-adjustment capacity. Then the mathematical model of the adjustable potential indicators of regenerative electric heating units is analyzed. And then fuzzy clustering algorithm is used to cluster electric heating users based on the energy consumption characteristics of users, and the upward adjustment capacity and downward adjustment capacity of electric heating clusters are analyzed. Finally,the mathematical model is verified by specific examples.