The best replacement for open fire is stove.

The best alternatives to open fire are rated as following:
★★★★★  stove
★★★  wood burning stove
★★  log burner
★  wood burner
★  multi-fuel stove
★  multi fuel stove
★  gas fire
★  campfire
  wood-burning stove

Your alternative for open fire is not listed? Suggest!
Speaking about open fire, one probably shouldn't forget about back boiler.

Other search terms related to open fire and their ratings are:
★★★★★ back boiler
★★★★ flue liner
You have in mind a companion for open fire and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of open fire in all years. Click on graph for more.
open fire
stove
wood burning stove