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This paper discusses estimatj ． on methods of steady state and unsteady state heat output in hot water fユoor heatlng systems ・ It beco皿es clear that Kollmar − Liese ' s meth6d vhich has been popu ユ ar 王 y used ， underestimates steady state heat transfer rate fro田 the fユoDr ． The authors propose a 1】 ew simple estimation method by applying DOE(Design of Experi 皿 ents) method ． On the other hand， there has been no simple estimation method for unsteady state two − dimensional heat transfer in floor heating systems ． In this paper ， precise respQnses of heat transfered frQm the fユoor obtained by two − dimensiona1 ． calculations are analyzed and classified ， and represen し ative responses are expressed by exponential polynomia ユ aPproximatio 【 ｝ ． Keywords：hot water fユoor heating system ， simp ユ ified estimation method ， DOE， steady sta し e heat output ， step response of heat output

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