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Hydronic Baseboard

Hydronic means hot water.  These traditional fin style baseboard units are very common and very effective.  They use high-temperature water (160-180ºF) from a boiler (also called a hydronic … Read more

Steam Radiators

Cast Iron steam radiators became popular in the late 19th century and were often fired in coal, then oil, and now on gas. Housing stock dating from this … Read more

Forced Hot Air Floor Register

Centrally Ducted Forced Air 

Centrally ducted forced air systems could be used for heating, cooling, or both. These systems have two parts: a) the appliance, which creates the hot or cold air … Read more


Fan Convectors

Each of these fan convector heat emitters receives hot water from the central-heating boiler. First, the water passes through a coil inside the unit. Then a fan blows … Read more

Mini-Split Heat Pumps

Ductless Mini-Split, Cold Climate Heat Pumps (CCHPs) are single room heaters. A conduit, which houses the power cable, refrigerant tubing, suction tubing, and a condensate drain  runs to each … Read more

Wall-vented gas heater

Direct-Vent Gas Heaters

Direct-vent gas heaters have the advantage of combusting the fuel right in the room where heat is needed, instead of remotely like a central heating furnace. Some models … Read more