Remington HH-70T-KFA Service Manual download pdf (Page 126)

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Gas Fired Heaters

Introduction to Natural Gas Heaters

Natural gas heaters will have distinct advantages and disadvantages when compared to the propane heaters mentioned earlier. The main

advantage of using natural gas heaters is the availability of fuel supply. Natural gas is available in most communities, as well as in most

industrial situations. With the fuel supply already on site and always available, natural gas may be the best alternative. As the availability

for natural gas increases, so will the natural gas heater’s share of the portable heater market. However, natural gas does have some

disadvantages. First, natural gas is not available in all areas. Second, the portability of natural gas heaters is limited by the gas pressure,

as well as by the length and diameter of the fuel supply hose. Next, it is important to maintain the proper volume of natural gas. The

last two disadvantages of natural gas heat are that there are not many heating applications where high pressure (pounds of pressure)

natural gas is available, and that there are not as many different model numbers available for natural gas as there are for propane.

However, there will be situation where the best heater option is to use natural gas.

Technical Issues with Natural Gas Heaters

The number one technical issue with natural gas heaters is the ability to get the proper natural gas volume. Most natural gas heaters

usually do not come with a fuel supply hose because the inside diameter (I.D.) of the hose size will vary depending on the available gas

supply pressure. That happens to be the number one technical issue with natural gas heaters: having the correct natural gas volume.

The Three Types of Natural Gas Heaters

Forced Air

These heaters are heaters that use an internal motor and fan to distribute heat. Forced air heaters are commonly called “torpedo”

heaters. Forced air natural gas heaters range in size from 150,000 BTU’S to 750,000 BTU’S through PHP. The advantages of the forced

air heater are many. The whole unit does not have to be in the area to be heated; only the discharge end of the unit has to be in the area

to be heated. This allows clean air exchanges with outside air. In addition, the forced air heater is also a “directional” heater. This

means heat can be focused on a certain item or place. The forced air heater usually has multiple safety features. These usually consist of

high limit switches, sail switches, air proving switches, tip switches (normally found on older units), spark plugs, igniter electrodes,

ignition control boards, valves, and even thermocouples. In addition, forced air heaters that do not have a thermocouple can use a

thermostat for temperature control. As with all heating systems, there are a few disadvantages associated with forced air units. The first

disadvantage is the fact that electricity is required for operation. Another disadvantage is that forced air is more of a complex unit to

troubleshoot and repair. Lastly, forced air units rely on three components to work properly: the timed delivery of air, spark, and fuel (in

that order).

Radiant

These heaters work on the principle of transferring heat from one object to another without heating the space in between. For instance,

the roof of a black car that has been sitting in the sun on a cool 60 degree day is much warmer than the surrounding air. Therefore, the

radiant heat from the sun heated the roof of the car without heating the space in between. That is the concept of radiant heat. As with

all heating systems, there are advantages as well as disadvantages.

The first advantage is that most radiant heaters require no external electricity. The second advantage of radiant heat is that the ground

level is heated first, maximizing the BTU efficiency more so than other heating sources. The third advantage is that the most popular

radiant heaters are in the 100,000 BTU range, making them ideal for using standard residential natural gas pressure. The disadvantages

are few. First, very few models have a thermostatic gas valve which means you cannot use a thermostat. Second, there are relatively few

BTU sizes available, mainly low pressure 100,000 BTU models and high pressure 250,000 BTU models.

Convection

These heaters work on the principle of heat stratification. Heat stratification means heating the topmost areas first, then forcing the heat

down in layers until it reaches the comfort zone (usually from ground level to 6’ off the ground). The main advantage of convection

heaters is that they are the most inexpensive heaters to purchase, providing the most BTU’S for the buck! The disadvantages of

convection heaters are twofold. First, since convection heaters work on the theory of heat stratification, most of the fuel dollars quickly

rise with the heat to the ceiling and away from the comfort zone. Second, with very few convection models available for natural gas,

large heating applications are not usually practical.

Gas Heater Service Info.

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Remington HH-70T-KFA Service Manual Page 126

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