Vent Free Wall Mounted Gas Combustion Space Heaters
Important Safety Information
Ventless gas space heaters use the room air for combustion. Unless you keep a
window opened slightly, an unvented heater will burn essentially the same air over
and over constantly reducing the level of oxygen in the room.
To protect yourself from oxygen depletion, unvented heaters should be equipped
with an oxygen depletion sensor (ODS). These devices sound an alarm when the
oxygen level in the room drops below 18%.
An oxygen depletion sensor should not be confused with a carbon monoxide
Also, take a look at this chart to find out if the installation of vent free gas heaters is
permitted in your state, city, or town.
All combustion space heaters should be professionally inspected every year just like
any other furnace. If your gas wall heater is vented, venting pipes should also be
inspected. Vents that are blocked, separated or corroded can result in the
accumulation of potentially fatal levels of carbon monoxide.
Carbon dioxide can also be produced if the heater is not properly set up and
adjusted for the type of gas used and the altitude at which it is installed.
Depending on the model, unvented combustion heaters should not be used at
altitudes greater than 3,500 feet and never more than 5,000 feet.
Vent free wall mounted gas combustion space heaters are permanent indoor fixtures
fueled by natural gas or an outdoor propane tank. The most popular models are the
vent free units since they're inexpensive to purchase and don't require expensive
In terms of the amount of heat you get for what you spend, wall mounted gas heaters
are 99% efficient and offer the best value when compared to other supplemental
heating appliances. This is especially true if you if natural gas is your heating source.
Although ventless gas space heaters aren't allowed for use as a primary heating
system, many homeowners report it satisfies most of their heating needs none the
Piezo type battery powered electronic ignition is a welcome feature for Seniors and
allows the heater to function during power outages. However, if the wall heater is
equipped with a blower it won't come back on until the power does.
Wall Heater Fuel Types
Gas wall heaters are usually designed to burn either natural gas or LP gas. However,
dual fuel models give you the option to burn one fuel or the other as circumstances
Gas Heater Systems
The two most common heat delivery systems are blue flame and infrared. Most blue
flame units heat by convection (rising heat) only and do not have a blower. The output
of the heater, in BTUs, is determined by the size (length) of the flame within the unit.
Infrared heaters employ ceramic plaques and a blower to distribute the heat; although
the blower is usually sold separately. The BTU output is determined by the number of
ceramic plaques within the unit.
Wall Heater Sizing
The size of the heater to adequately heat your home depends on the square footage
of the area you want to heat and the amount of heat loss. If the area you intend to
heat is well insulated and weatherized you would need around 35 BTUs per square
If the area is poorly insulated and drafty figure on 45 BTUs per square foot.
Wall Mounted Heater Pricing
Naturally, the larger the heating capacity, the more the heater will cost. There is also a
difference in pricing between blue flame and infrared heaters with the blue flame
models costing roughly 20% more than infrared.