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: Most gas fireplaces and water heaters use a 750 millivolt (mV) generator. Some older or specific systems might use a 250mV version. Connection Type :

: Measure your existing thermopile's wire length. Common lengths include 24" , 36" , and 48" . It is safer to buy a longer lead and carefully coil the excess than to buy one that is too short. 2. Selecting a Product buy thermopile

: Look for reputable manufacturers such as Honeywell (e.g., Q313 series), Robertshaw (e.g., 1950 series), or White-Rodgers . Replace Thermopile in Rheem Water Heater: Expert Q&A Guide : Most gas fireplaces and water heaters use