The best replacement for water heater is boiler.

The best alternatives to water heater are rated as following:
★★★★★  boiler
★★★★★  tank
★★★★  tankless
★★★  gas water heater
★★★  electric
★★★  tankless water heater
★★★  electric water heater
★★★  tank water heater
★★  gas
★★  hot water heater
★  furnace
★  hot water boiler
★  regular water heater
★  tankless hot water
★  kettle
★  geysers
★  geyser
★  on demand
  boiler radiant heat
  propane
  boiler radiant floor
  electric shower
  indirect
  traditional water heater
  standard water heater
  gas boiler
  ecotemp
  water heater
  50 gallon
  electric cost

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

Other search terms related to water heater and their ratings are:
★★★★★ power vent
★★★★ heat pump
★★★ anode rod
★★★ expansion tank
★★ water softener
★ recirculating pump
★ storage tank
★ geothermal
★ circulating pump
hot water
pressure relief valve
You have in mind a companion for water heater and it is not yet here? Propose!



Google Trends

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