Photograph of building damage near Los Angeles 2000 © Daniel FriedmanGas Fireplaces & Gas Space Heater Defects List & Home Inspection Education

  • DEFECTS LIST - HEAT SPACE & FIREPLACE, GAS - CONTENTS: Defects in gas fireplaces. Defects in gas space heaters. Lists of important defects for residential buildings. What does a home inspector need to know? Home inspection training and education curriculum recommendations
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Gas fireplace & gas space heater inspection & defect checklists.

This article lists significant gas heater or gas fireplace defects, definitions, and home inspection education topics.

This article series, beginning at BUILDING DEFECTS LISTS, provides lists of common building defects and basic defect knowledge that also outline recommended curriculum content for home inspector education.

The building defects and inspection points listed in these articles also guide homeowners and home buyers to building areas that merit careful attention and often point areas of safety concern or important maintenance and repair tasks.

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Home Inspection Education Curriculum - Gas Space Heaters & Fireplaces

Space heater (C) Daniel Friedman4.8   Gas Space Heaters and Fireplaces Inspection Recommendations & Lists of Defects

Safety Warnings about Gas-Log Fireplaces & Gas-Fueled Space Heaters in Buildings

Improper installation, venting, combustion air supply or use of gas or kerosene fired heaters can produce high indoor carbon monoxide(CO) levels.

Watch out: Never go to sleep in an enclosed space with a space heater left operating. In addition to the CO hazards there is a risk of oxygen depletion which can also lead to asphyxiation. Also see Unvented heaters, below.

Tight House conditions can cause dangerous carbon monoxide hazards where gas fired fireplaces or space heaters are in use

Even if previously there were no backdrafting or CO problems at a building, retrofits to improve the energy efficiency of a home can change its air leakage rate and might lead to backdrafting.

Unsafe models of space-heating equipment

For some examples see SAFETY RECALLS CHIMNEYS VENTS HEATERS - warning: this is not an exhaustive list

Un-vented heaters or space heaters installed in buildnings

Gas log fireplace (C) Daniel FriedmanUn-vented heaters or space heaters, such as "vent-free" fireplaces or gas-log fireplaces. Un-vented appliances are in stunningly wide-spread use and we [DF] found it interesting to read that for at least some "un-vented" gas log fireplaces even the installation instructions specified a requirement for outside combustion air and venting.

Modern versions of un-vented heaters usually include a sensor that is intended to put out the fire if the oxygen level falls too low.

That approach may not detect CO production at all. In this home in Mexico (photo above left) we observed that it was impossible to operate the gas-log fireplaces without the CO detector alarm sounding even when the carbon monoxide sensor was placed more than 20 feet away from the fireplace.

Incidentally, CO detectors should be installed about 10 feet away from woodstoves, pellet stove, coal stoves, and gas log fireplaces. Not 20 feet as we did.

4.8.1 Knowledge Base for Gas Heaters & Fireplaces: Inspections & Defects

1.    Describe the function of gas space heaters and gas fireplaces.

2.    Describe the types of gas space heaters including wall furnaces, floor furnaces and room heaters. Highlight the difference between these and forced air furnaces.

3.    Describe gas fireplaces and gas logs, highlighting the differences between these and wood burning fireplaces.

4.    List the materials and components of each of the systems listed above.

5.    Describe the features of good installation and repair technique for each of these systems.

6.    Define the following terms with respect to gas space heaters and fireplaces: decorative appliance, radiant system, convective system, vent, unvented appliance, direct vent system, fire stop spacer, inspection cap (for furnace).

7.    Identify the code or standards which apply to gas fired space heaters and fireplaces in your area.

4.8.2 Inspection skills for Gas Heaters & Fireplaces: Inspections & Defects

1.    Describe the inspection procedure for gas fired space heaters and fireplaces.

2.    Identify the following common defects listed on the next page.

3.    Describe the implication of each defect.

4.    Identify safety issues for the inspector and occupant of the home (gas explosion, electric shock, fire, combustion products poisoning occupants, injury due to moving parts).

5.    Communicate findings with client verbally and in writing, recommending corrective action where needed.

Typical Visually-Obserable Gas Fired Space Heater, Room Heater, or Fireplace Defects

Space heater combustible clearance hazard (C) Daniel FriedmanClearance to combustibles

Combustion Air Hazards

Heat Exchanges in Gas-Fired Space Heaters   

• Cracks, holes or rust 

• Soot or deposits   

• Rusting or dirty

• Scorching             

Fan Limit Switch Defectson Gas Fired Space or Room Heaters

• Set wrong or defective

• Improperly wired

• Mechanical damage

• Missing cover

Cabinets: Gas fired space heaters                                                    

• Combustible clearances           

• Mechanical damage

• Missing components               

• Obstructed air intake

• Rust                              

• Scorching                                                          

Inspection Defects Specific to Gas Fired Wall Furnaces

• Ducts added

• Not listed, certified or approved

• Unvented furnace in bedroom or bathroom

• Unvented furnace

Inspection Defects Specific to Floor Furnaces

• Cap missing or damaged

• Firebox cracked or rusted

• Not permitted

• Not listed, certified or approved

• Restricted airflow causing overheating

• Thermostat remote

Common Defects Observable at Room Thermostats Used with Gas Space Heaters or to Control Gas Fireplaces             

• Anticipator 

• Damaged

• Dirty                             

• Loose                            

• Not level                        

• Poor adjustment or calibration    

• Poor location                    

Defects in Blower Assemblies Used on Gas Fired Space Heaters                                        

• Dirty

• Fan belt loose, worn or damaged 

• Inoperative

• Noisy

• Overheating

Inspection Defects Specific to Gas Fired Room Heaters

• Fireplace damper not fixed open

• Not labeled for use in a fireplace

• Unvented

• Poorly secured         

• Running continuously

• Rust

• Too small

• Unbalanced or vibration 

Inspection Defects Specific to Gas Fireplaces & Gas Logs

• Damper in existing fireplace not fixed open

• Glass door problem

• Not suitable for use in a bedroom or bathroom

• Unvented (may be acceptable ?)

• Asbestos-suspect based on age

Gas Supply Defects at Gas Fired Space Heaters, Room Heaters, Fireplaces

Improper gas piping material

Missing or improperly located gas shutoff valve

Indications of leaks (odors, deposits, complaints)

Readers should see HEATING SYSTEMS for our complete list of articles on this topic. Also see HOME & BUILDING INSPECTORS & INSPECTION METHODS.

Use the Search Box at the top or bottom of these pages to find in-depth information about building, energy savings, and indoor environment inspection, diagnosis and repair at this website.

Watch out: these inspection lists do not list all possible defects for the systems discussed, and not all home or building inspectors will examine all of the items listed here. CONTACT us to suggest corrections or additions to articles at this website.

These curriculae and building defect lists are based on smilar curriculum documents first prepared by Joe Scaduto, an ASHI member who prepared course material for Northeastern University's Building Inspection Certificate program in 1988, subsequently by DF, InspectApedia's editor, for New York University ca 1988 and later, with others, recommended to ASHI, the American Society of Home Inspectors.

The curriculum and lists of defects are informed by additional analysis of the process of home inspection that was developed beginning Calgary, AB for Canadian and U.S. home inspector education and certification examinations in 1997.

Other early contributors to home inspection education in the U.S. and Canada include Dr. Jess Aronstein, Alan Carson, Mike Casey, Mark Cramer, John Cox, Dwight Barnett, Douglas Hansen, Rick Heyl, Larry Hoytt, Bill Merrill, Kevin O'Malley, Dennis Robitalille, Keith Peddie, Pat Porzio, Roger Robinson.


Continue reading at FIREPLACES & HEARTHS or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.





Or see ANTIQUE HEATERS STILL in USE for an example of an antique but still-used gas fired floor/wall heater

Suggested citation for this web page

DEFECTS LIST - HEAT SPACE & FIREPLACE, GAS at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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