Vent-Free fireplaces have been very controversial in the fireplace industry for over decades. Many argue that these fireplaces are unsafe. In fact, in 1996, they were banned by Alaska, Montana, Minnesota, New York, and Massachusetts, however, after strong influence by the industry, all but California still bans them. There are several gases emitted but of all dangerous gases, carbon monoxide is most notorious. Homeowners are unaware of this colorless and odorless gas, and this can cause all manner of health complications. If you have already installed a vent-free propane heater do yourself a favor and invest in a carbon monoxide detector, including near the. A ventless gas heater can use either. Easy to install: Compared to vented models, vent-free gas heaters are simple to install. The easy installation often means even lower upfront costs. Extremely efficient: Ventless heaters are very efficient. The majority are 99.99% efficient, meaning only about 0.01% of the fuel isn’t converted to useful heat. While some may be hesitant to install a vent-free fireplace because of the lack of venting, vent-free fireplace technology has many benefits. Usilton says that this method is safe and sound—and has come a long way from the rudimentary heating process that originated in Europe and the United States about 80 years ago.

Can A Vent Free Stove Be Installed Safely Outside
Can A Vent Free Stove Be Installed Safely At Home
Natural Gas Vent Free Stove

An unvented heating appliance, also called a vent-free appliance, has no chimney vent and is located in the space being heated. Combustion products are discharged into the heated space rather than exhausted to the outdoors through a chimney. Typical fuels are natural gas and LPG (propane). While convenience is the major advantage of vent-free gas heating products, the degradation of indoor air quality is a concern. In some areas state and local codes regulate unvented heaters.

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What are some of the advantages of vent-free heating products? Because no vent pipe or chimney is required vent free heaters are easy and inexpensive to install. Many heaters do not require electricity allowing them to be used for emergency heat. Most are quiet, easy to use, and efficient. In most locations in the country gas is a relatively inexpensive fuel. Many heaters are designed to create a comfort zone in a single room, reducing heating costs.

What types of vent-free heating appliances are available? Small portable units for use in a single room are manufactured for emergency heating–others are made to serve as a permanent heat source. Optional blower kits and ductwork allow them to heat two or more rooms. Available styles include cabinet mounted units, wall mounted units, fireplaces, and fireplace inserts with a variety of flame patterns including blue flame, infrared, yellow flame, and glowing logs. Sizes range from under 5,000 Btu/hour to over 38,000 Btu/hour.

How efficient are direct vent heating appliances? While the flame burns with over 99 percent efficiency not all the heat is available. Approximately 9.6 percent of the heating energy available in gas comes from burning the hydrogen which produces water vapor. To recover this heat, the water must be condensed. With an unvented heater, the water vapor condenses on room surfaces, which increases the potential for wood rot, peeling paint, plaster failure, and mold growth. To prevent wet windows and walls, the vapor must be prevented from condensing, reducing the maximum efficiency of the heater to 90.4 percent.

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Unvented heaters release pollutants into the house. Once combustion pollutants are in the house outside air must be provided to dilute and remove the contaminants. The additional ventilation needed to reduce pollutants to tolerable concentrations depends on the tightness of the building and the health of the occupants. Heating cold outside ventilation air reduces the thermal efficiency of the heater. The National Fuel Gas Code, commonly used in determining outside air requirements, is based on 1.0 air change per hour (ACH). Providing 1 ACH to a 10 x 20 foot room in Iowa would require over 1,000 Btu/hour, which is over 25% of the output of a 3800 Btu/hr heater.

What pollutants are released into a room when an unvented heater is used? The main combustion products formed when gas burns are:

Carbon dioxide (CO₂), a non-toxic gas formed during complete combustion of carbon based fuels.
Carbon monoxide (CO), a toxic gas formed if combustion is incomplete.
Nitrogen dioxide, a toxic gas.
Water vapor.

What about carbon monoxide risks? CO, a colorless, odorless, tasteless, non-irritating poison, is highly toxic and can cause death or permanent brain and organ damage. CO poisons more people than all other poisons combined. When properly maintained and adjusted, gas heaters produce low amounts of carbon monoxide. One cause of carbon monoxide poisoning from unvented heaters– incomplete combustion caused by lack of air–has been virtually eliminated in newer heaters by use of Oxygen Depletion Sensors (ODS). Unfortunately, the ODS does not respond to incomplete combustion caused by improper gas pressure; dust, dirt, or rust on the burner; incorrect placement of artificial logs in a gas fireplace; or disruption of the burner by air currents. CO poisoning from unvented heaters remains a concern.

What is the hazard of carbon dioxide? CO₂ is not toxic. At high concentrations it can cause sleepiness, headache, and contribute to the “stuffy” feeling of closed houses. All unvented gas heaters, even when burning properly, produce large concentrations of carbon dioxide, raising the levels of in the house. What is the hazard of nitrogen dioxide? NO₂ is a toxic gas that at lower concentrations is an upper respiratory irritant causing cough, sore throat, headache, vertigo, and nausea. Some NO₂ is always produced in a burning flame, the

Can A Vent Free Stove Be Installed Safely