Air preheating means at a vertical steam or hot water boiler

Boiler having a separable furnace and heat exchanger

Combined liquid filtering and heating apparatus

Compartmented gas flue for NOx control and particulate removal

Diesel fueled engine coolant heater

Electric furnace waste heat recovery method and apparatus

Exhaust boiler

Flue baffle for gas-fired hot water tanks

Flue heat exchanger

Fluid heater with spiral hot gas flow

Furnace

Gas generator for fine-grained coal fuels

Gas water heater

Gas water heater damper/baffle

Heat exchanger

Heating equipment for an installation using steam and heated gas

Heating system for liquids

High efficiency tank type continuous flow and self cleaning...

High efficiency water boiler having finned heat exchanger

Hot water apparatus