Response to With the info you gave us it leaves several choices on model, In general, the gas valve and the burner orifices and the pilot assembly would be the items needing to be changed Raypak RP2100 Digital 185 - 405 Model Heaters (11-01-98 +) Raypak R185, R265, R335, R405 (11-01-93 thru 11-01-98) Raypak RP2100 Digital Gas Models R185A, R265A, R335A, R405A Raypak RP2100 Digital Gas Models R185B, R265B, R335B, R405B

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