Are Vent-Free gas products safe to use in the home?
Yes. There is a national safety standard for vent-free gas appliances, ANSI Z21.11.2-2002 and the ANSI Z21.11.2a-2003 addenda, and all of KOZY-WORLD's heaters are certified to meet these standards.
How can a consumer be sure of this?
Look for the CSA symbol on product packaging. This is a certification mark from an accredited safety certification-testing agency (Canadian Standards Association—which covers both the United States and Canada).
Is it safer to use a vented model instead of a vent-free one?
Both vented and vent-free gas products are safe, provided they have been certified and they are installed and operated in accordance with KOZY-WORLD’s instructions.
What else should a customer know about vent-free gas product usage and care in their home?
As with all gas appliances, the customer should read and follow the instructions and safety warnings provided on the unit and within the owner’s manual. The area in which the appliance is installed should always be kept clear and free of combustible materials, gasoline and other flammable vapors and liquids. Vent-free gas heaters must be installed be a qualified gas installer and local codes should be checked to ensure proper installation. Also, yearly cleaning, maintenance and professional inspection by a certified gas technician is required.
General Vent-Free:
Can a vent-free gas heater be used as a sole source of heat?
All major building codes categorize vent-free products for supplemental use and recommend that a primary source of heat (for example, a furnace) be present in the home before a vent-free product is installed. Operating instructions clearly state they are to be used as supplemental heating only.
Are vent-free gas products widely accepted for use in the United States?
Currently, most states in the U.S. allow for the sale and installation of vent-free supplemental gas heat appliances. Local codes may vary. Note that Massachusetts requires Board of State Examiners of Plumbers approval before installation. KOZY-WORLD’s approval code is G1-1104-48. Also, California does not currently permit the use of vent-free gas heaters.
Do vent-free gas heaters take all of the oxygen out of the room?
All products which burn gas and draw combustion air from the living space “take oxygen” from that space. This includes gas cooking ranges which are vent-free units. The owner’s manual on our products and any local code official will inform about the need for make-up combustion air. A typical well-insulated home still has sufficient air movement to completely exchange indoor air for fresh outdoor air several times per hour. If this air exchange did not take place, normal human breathing would eventually take all the oxygen from that space. This normal air exchange provides more than enough make-up air for the vent-free heater. Vent-free heaters have an ODS or Oxygen Depletion Sensor which automatically shuts off the gas supply in the rare event that the oxygen level in the room falls to 18%. This is well above unsafe levels as established by ANSI (American National Standards Institute).
Can I use my existing chimney?
Kozy-World vent-free Log Sets are certified to be used with the chimney damper open or closed. The chimney should be inspected and cleared for operation by your installer if used to vent combustion products. It is generally better for the appliance if the chimney has a liner installed. Please consult your dealer or installer for definitive information.
Is it possible for me to convert the gas type on my heater?
Vent-free heaters cannot be changed from one gas type to another. The Canadian Standards Association has certified each individual heater according to the type of gas being used. Converting the gas type will change the certification and void any warranty on the heater.
Does the unit produce any moisture?
Any vent-free unit no matter what the gas type produces water between one half to one pint of moisture per hour, in the room. Under normal household conditions, this will not pose a problem. In the event you are experiencing a problem, you will need to provide an outlet for the moisture. This can be done by using a dehumidifier or providing additional ventilation.
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