Radiant Heating – Radiant Infrared Heating Systems – Gas
Natural gas infrared heating is very efficient. Compared to a forced air heating system, natural gas infrared radiant heating can save up to 50% in heating costs.
High Intensity Gas Infrared
A perforated ceramic tile or ported grid is the radiant mechanism in high intensity gas infrared heaters. A valve introduces the natural gas and air mixture to the surface of the ceramic tile through ports where the mixture combusts to form a thin flame sheet. The mixture burns as a series of discrete flames, heating the tile to incandescence and providing radiant heat.
These heaters operate unvented so fresh air must be supplied and clearances to combustibles are greater for these units than low intensity models to allow for circulation of combustion air and removal of combustion by-products. Multiple units can be controlled by the same thermostat or controlling device.
High intensity heaters are appropriate for partial building heating and for total building heating where high mounting heights are required.
High intensity units have surface temperatures of 1200°F to 1800°F and give off a red glow when operating. Inputs range from 20,000 Btu/h to 120,000 Btu/hr.
Low Intensity Gas Infrared
Low intensity gas infrared heaters consist of a straight or U-shaped tube mounted in a metal housing. Straight tube heaters are recommended for total area building heat whereas U-tube systems are suggested for spot or partial area heat for a more concentrated, even heat.
A burner located at one end of the tube fires down towards the closed end in single-end designs or towards the exhaust end for U-tube designs. As the burner fires through the inside of the tube, the tube is heated to incandescence and radiates energy.
These are vented heaters, which can be positioned in pairs and common vented although the heaters must be controlled by the same thermostat or controlling device when commonly vented. Common venting helps minimize the number of openings through the roof or walls of the building and also helps alleviate negative air pressure.
Low intensity models achieve surface temperatures of 600°F to 800°F. Sizes for these heaters range from 40,000 Btu/h to 200,000 Btu/h.