Heat recovery and filter system and process for furnace exhaust

Heat recovery apparatus and an improved heat recovery method

Heat recovery apparatus and heat recovery method

Heat recovery apparatus and method

Heat recovery device for boilers

Heat recovery system for an incinerator

Heat recovery system for furnaces and the like

Heat recuperating water heating system

Heat regenerator to recover both sensible and heat of condensati

Heat-sink water heater

Heating apparatus with a heat exchanger

High output mini hydronic heater

Hot water booster

Hot water probe

Hot water supply system

Hot-water supply system having supplementary heat exchanger

Improved continuous low fluid exchange water heater

Method and apparatus for improving heat transfer

Method and apparatus for utilizing waste heat in hot water heate

Method and apparatus for utilizing waste heat in hot water heate