Answer (1 of 4): Pro: Supplies water vapor. Con: Supplies water vapor which can cause mold and a lot of other problems. Con: Produces carbon monoxide, which can kill your entire family.

May 26, 2007 - Unvented heaters are great backup heat if the power goes out. They are great in fireplaces to run a couple of hours a day for extra comfort and ambiance. They are OK to run in a bathroom occasionally to take the chill off. They are outlawed by code in bedrooms.

March 31, 2020 - For this reason, it is not legal to install vent-free heaters in rooms where people sleep, and some local building codes do no allow them to be installed at all. Do your research if you are considering one! Vent-free propane gas heaters are available in two basic types: blue flame or infrared; both are extremely efficient (typically more than 99 percent).

June 20, 2024 - Some disadvantages of ventless gas fireplaces include indoor air quality concerns, the potential for moisture buildup, and oxygen depletion. Get quotes from up to 3 pros!

November 29, 2010 - I would want a vented heater in a basement area unless you have a means of circulating the air through the whole house. Basements are prone to humidity problems without the extra the ventless dumps in the space. I had a ventless in an enclosed porch and it was great for that area. A friend has one in a dining room but he runs a wood stove all the time in the living room so the condensation moisture actually is a bonus.

By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. ... I have been informed by a gas company manager that vent-free propane heaters cannot be installed and used in a bedroom.

May 19, 2009 - Although gas heaters burn much more efficiently than wood- or pellet-burning units, the resulting carbon monoxide has always called for an outside air vent to be installed to safely operate the unit. Ventless gas heaters, however, do not use such a vent; instead, they simply vent the heated combustion exhaust directly into the room in which they are placed, and provide a much more effective heat source as a result.

August 10, 2023 - As ventless fireplaces do not require the construction of a chimney or venting system, the installation costs are generally lower compared to other fireplace options. Additionally, their energy efficiency can result in reduced heating expenses ...

January 21, 2016 - So we examined the pros and cons ... thing as a truly ventless fireplace. Completely ventless would mean that no oxygen can enter, no gases can escape, and the fire would put itself out within minutes....

April 28, 2024 - Ventless gas fireplaces are nearly 100% energy efficient because they convert almost all the fuel into heat, unlike vented counterparts, which lose a significant portion of heat up the chimney.

A: Vent-free appliances are the most fuel-efficient gas heating products on the market today. All ventless gas appliances are 99.9 percent efficient. Virtually all of the gas or propane burned by the product is converted into room-warming heat.

Vent Free vs Vent through wall heaters

Best answer: Minisplits are much more efficient than natural gas wall heaters. Operating cost depends on your relative cost of natural gas versus electricity. Climate impacts for minisplits are likely lower. Minisplits will be easier to place where you want as you can run the refrigerant lines some distance, while the gas heaters need to have a vent right behind them.

October 14, 2025 - Unlike wood-burning fireplaces, ventless fireplaces produce no ash or air-borne debris that can collect on furnishings and need to be cleaned up. One of the by-products of combustion is water vapor, and lack of a vent means this is circulated ...

Efficiency: More efficient than gravity vent systems due to controlled venting. Flexibility: Suitable for various home layouts and installations. ... Air Quality: Uses indoor air for combustion, which may affect indoor air quality.

November 5, 2025 - This is safer for your health and doesn’t impact the air quality inside your home, according to a study conducted by the U.S. Environmental Protection Agency (EPA). From an aesthetic perspective, vented gas fireplaces tend to produce larger fires than ventless models.

October 22, 2024 - Ventless gas fireplaces burn either natural gas or propane to generate heat. Their byproducts are released directly into the room, which creates a cozy atmosphere without the complexities of traditional fireplaces. However, while they provide numerous benefits, safety concerns arise due to the unique way they operate.

January 12, 2020 - Ventless ones are safe (I heard) but over time they leave a light black film everywhere. I wouldn't recommend. ... Not very safe as it consumes oxygen that you need to live. ... I have a 30k btu mr heater, in a 12x16 shed.