The best replacement for heater is gas water heater.

The best alternatives to heater are rated as following:
★★★★★  gas water heater
★★★★★  tank
★★★★  central heat
★★★★  electric water heater
★★★  electric
★★★  tank water heater
★★  boiler
★★  radiator
★★  electric blanket
★★  edenpure
★★  tankless
★★  gas
★★  dehumidifier
★★  furnace
★★  heat pump
★★  gas boiler
★  shotgun bioshock infinite
★  ceramic
★  oil fired boiler
★  air conditioner
★  gas heat
★  electric heater
★  boiler radiant floor
★  regular water heater
★  oil filled
★  tankless water heater
★  hot water heater
  blower
  baseboard
  oil radiator
  gas furnace
  fan heater
  water heater
  oil boiler
  halogen
  standard water heater
  space heater
  oil-filled radiator
  blue flame
  convection heater
  electric hot water heater
  ceramic heater
  fireplace
  propane
  77
  kerosene heater
  gas hot water heater

Your alternative for heater is not listed? Suggest!
Speaking about heater, one probably shouldn't forget about fan.

Other search terms related to heater and their ratings are:
★★★★★ fan
★★★ humidifier
★★ filter
★ tank
★ blower
★ ionizer
anode rod
air purifier
digital display
power vent
You have in mind a companion for heater and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of heater in all years. Click on graph for more.
heater
gas water heater
tank