Although the heat function operates separately from the insert's flame or ember lights, it is not possible to have a completely dark fireplace while the heat on. The flame can be turned off, but other lights cannot. One of the requirements for certification through CSA/UL/ETL testing laboratories is that there should be a visible indication that the heater is on.
- In 18" models, the power switch that operates the heat function includes a red light.
- In 23" and larger models with a log and ember bed, the ember bed will stay slightly aglow while the heat is in use. For these units, the fire/ember display can be cycled through by pressing the flame on the remote, L4 through L1. If the heat is on, there is an additional setting with even less lighting than L1.
- In 23" and larger models with crystals and side lights, both will remain on during use of the heater. Because these units include a color changing feature, the lighting does not lessen. The flame can be turned off, but the other lights cannot.