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How a Gas Log Safety Pilot Works
and how to light a gas log safety pilot.




For details about gas log burners read: Gas Log Burners and Safety Pilot Controls




How does a gas log safety pilot work?

Aside from the electronic ignition systems, the basic premise for the safety pilots used on gas logs is the same as those used for decades with wall heaters, hot water heaters, and nameless other gas appliances.

How do you light a gas log safety pilot?
You turn the control knob to the pilot position, push the knob in, light the pilot with a match, then hold the knob down for 30 seconds or so until the pilot stays lit by itself. Once the pilot light will stay lit on its own, you can then move the knob to the "On" position. For manually operated gas logs such as the one pictured to the right, this will turn the logs on. For remote controlled gas logs, this will put the valve in the necessary position for the remote control to actuate the burner.

What if the pilot will not stay lit?
If you cannot get the pilot to light at all, meaning you hold the button down in the pilot position and hold a match up to the pilot and nothing happens, then either the valve is bad or something is abstructing the gas from coming into or going through the valve. If you can get the pilot to light with a match, but it will not stay lit on its own after holding down the knob for 30 seconds, then put the knob back into the off position, wait 5 minutes and try again. If it still will not light, then something is definately wrong and you should have a professional check it out. This page is not meant to be a trouble-shooting guide for gas logs, but in general, if you cannot get your safety pilot to stay lit, It could be that the pilot flame needs adjustment, the thermocouple has gone bad and needs to be replaced, the entire valve has overheated and must be replaced, or something is abstructing the gas line. In any case, it is probably time to seek the assistance of a professional. Any plumber or heating and air conditioning service man who deals with gas appliances with a safety pilot should be able to help you.

How does a safety pilot actually work?
Although most of us have learned how to light one of these things at some time or other, few of us have any idea as to how this ingenious little safety system actually works.

So here is a brief, but hopefully useful explanation of how gas log safety pilots work so you can decide if it is something that you want or need. You may also find this information helpful for any other device that has a similar safety pilot.

Gas Logs that have a safety pilot have a valve body that is attached directly to the burner. This valve body that has 2 separate valves inside that control the gas: The valve to the main burner and the valve to the pilot flame. When the pilot is lit, the flame directly hits what is called a thermocouple (or thermopile). The thermocouple is the ingenious device that makes the whole system work. The physical properties of the thermocouple are such that it actually generates electricity when there is a great enough difference in temparature between the tip of the thermocouple and the base. If the pilot flame is too hot, then the entire thermocouple gets hot and there is not enough temperature difference to create a current. If the pilot flame is too low or not coming into direct contact with the thermocouple (or simply blown out), then there is not enough heat to generate a current. This is why the proper adjustment of the pilot flame is necessary for gas appliances that have a safety pilot.

Now, on to how the pilot system works. The electricity from the thermocouple is used to power an electromagnet that holds the pilot valve open, thus allowing the pilot to stay lit by itself. The amount of electricity needed must be within a certain range of millivolts in order for this to happen. If there is not enough electricity (or no electricity) being generated, then the electromagnet no longer functions and the pilot valve shuts. When you turn the knob to the pilot position and push it in, you are in fact manually opening the valve to the pilot flame. Once the pilot gets the thermocouple hot enough, the electromagnet engages and keeps the valve open. This is why you need to keep the knob depressed for about 30 seconds.

After the pilot is lit and stays lit on its own after releasing the pilot know, you can then turn the knob to the "ON" position. With manually operated safety pilots, turning the knob to the on position will light the logs and you can adjust the flame height using the control knob. With remote controlled systems, turning the knob to the on position simply puts the main valve in a position to be opened and closed buy whatever means the remote control uses. In the case of a remote controlled valve, some will have a battery operated device that opens and closes the valve to the main burner, thus turning the logs on and off. More sophisticated systems (called variable flame remotes) will have a battery operated motor attached to the flame adjustment knob that will allow you to adjust the flame height as well.

The main burner valve is designed such that if the pilot valve is closed, no gas can flow through the main valve, even if you have it in the on position. So as long as the pilot light is on and heating the thermocouple properly, the system is operational and gas can then be allowed to pass through the main burner valve. If the pilot light gets turned off or blown out (or in some cases gets too hot), then all valves are closed and no gas can pass through the system.

When the main burner is turned on, either by a remote controlled unit or by manually turning a knob, gas flows through the main valve and comes out the holes in the burner. The flame from the safety pilot is positioned just above the first several holes in the main burner, so when gas flows out of the main burner and reaches the safety pilot, it automatically ignites.

So again, if the safety pilot is not lit (or for some reason the safety pilot gets blown out), the system automatically closes both valves so that no gas will flow through either valve until the safety pilot is re-lit. This prevents the system from allowing gas to flow freely into your home at any time in the event that the safety pilot blows out, or someone turns on the gas to your fireplace without lighting it.


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Answers to Recent Questions Posted To This Page
  1. Question #8686 - Posted: 8/28/2010 2:17:12 PM

    Gas Logs Question

    View page where question was posted

    where can I buy single logs for a fire pit made for propane gas?

    Answer: We can supply you with the single logs you need for your firepit. Please give us a call so we can discuss your application and get you what you the gas logs you need.

  2. Question #8685 - Posted: 8/28/2010 12:14:38 PM

    Gas Logs Question - R.H. Peterson R.H. Peterson HRDG4-16 - 16" Rustic Oak Designer Plus Vented Gas Logs with Burner for Natural Gas Fireplaces. Model PL-HRDG4-16

    View R.H. Peterson HRDG4-16 - 16
    View R.H. Peterson HRDG4-16 - 16" Rustic Oak Designer Plus Vented Gas Logs with Burner for Natural Gas Fireplaces. model PL-HRDG4-16

    What about using these logs with LP? We love our Peterson logs and want to buy a set for our daughter, but she has LP, not natural gas.

    Answer: Virtually all of the gas logs you see on our website can be ordered for use with LP gas. You can change the gas type in the dropdown menus when viewing the log set on the product detail page, or you can select LP gas in the left hand navigation when searching our site. Keep in mind that LP gas requires a safety pilot, so if you are viewing match-light gas log sets for Natural Gas, you will get a warning stating that a safety pilot is required. Here is a link to this particular gas log with the most basic LP burner system and safety pilot: Peterson 16" Rustic Oak Gas Logs for LP Gas.

  3. Question #8655 - Posted: 8/27/2010 12:58:28 AM

    Gas Logs Question - R.H. Peterson R.H. Peterson CHDG4-16 - 16" Charred Oak Vented Gas Logs with Burner for Natural Gas Fireplaces. Model PL-CHDG4-16

    View R.H. Peterson CHDG4-16 - 16
    View R.H. Peterson CHDG4-16 - 16" Charred Oak Vented Gas Logs with Burner for Natural Gas Fireplaces. model PL-CHDG4-16

    need diagram to place logs

    Answer: If you own the Peterson Charred Oak gas logs, then you can refer to the Peterson Charred Oak Gas Logs Installation Manual for instructions on setting up the logs. If you own a different brand or model, we will need to know what that is in order to help you.

  4. Question #8653 - Posted: 8/27/2010 12:53:32 AM

    Gas Logs Question

    View page where question was posted

    fireplace dimension 42" wide, 24" high, 28" deep, 28" wide at base What size gas burning, coals fits best, 24 or 30?

    Answer: If you choose the most basic on/off controls or match light system, then you should choose a 30" gas coal fire in your fireplace. However, each burner and control system combination has different clearance specifications from the side walls of your fireplace in order to keep cool and prevent the safety valve from melting, so some of the other control options may require you to use a 24" set. Please give us a call so we can help you choose the right size.

  5. Question #8651 - Posted: 8/27/2010 12:42:50 AM

    Gas Logs Question

    View page where question was posted

    Need gas fireplace logs with automatic ignition. Do you sell them? Need it for a rental unit.

    Answer: Yes, we carry various types of gas log ignition systems that operate from remote controls, thermostats, wall switches and more. Please give us a call so we can discuss your needs and help you choose the best gas logs for your fireplace.

  6. Question #8650 - Posted: 8/27/2010 12:41:15 AM

    Gas Logs Question

    View page where question was posted

    can i use my inside vented propane logs outside in a firepit?

    Answer: Indoor gas logs will not survive in an outside setting...particularly in a fire pit that will be exposed to moisture or rain. You need a special stainless steel burner system to handle the moisture. Use this link to find all of our Gas Logs for Outdoor Fireplaces and Fire Pits

  7. Question #8649 - Posted: 8/27/2010 12:37:55 AM

    Gas Logs Question

    View page where question was posted

    I am interested in the 30" charred majestic log set with a G45 stainless steel burner (outdoor fireplace) - can you send me price and availability information?

    Answer: The Peterson Charred Majestic gas logs are not designed to use the G45 stainless steel burner. Because the logs are so massive, they require the GX45 burner system which includes a heavy duty grate that can withstand the weight and size of the logs. This particular burner and grate combination is not available in stainless steel for use outdoors, which is why you will not find the Charred Majestic Oak gas logs in our outdoor fireplace log section. Please call us so we can help you find the right gas logs for your outdoor fireplace.

  8. Question #8645 - Posted: 8/26/2010 7:17:29 PM

    Gas Logs Question

    View page where question was posted

    Do you sell the Eiklor brand.

    Answer: No, we do not recommend or sell the Eiklor brand of gas logs. Each year, we view them at the annual national fireplace trade convention to see if they meet our standards of value and excellence, and we still have decided not to carry them. The Peterson Real Fyre gas logs have so much more to offer and are approximately 1/2 to 2/3 less expensive. The only advantage we have found with Eiklor is their ability to custom make large massive gas logs for industrial or commercial applications. These types of log sets sell for $10,000 to $25,000 per application and are only available purchased direct from the factory. Please give us a call and we will be happy to help you find the best gas logs for your fireplace.

  9. Question #8641 - Posted: 8/26/2010 12:10:55 AM

    Gas Logs Question - R.H. Peterson R.H. Peterson HSG4-24 - 24" Ripped Split Oak Vented Gas Logs with Burner for Natural Gas Fireplaces. Model PL-HSG4-24

    View R.H. Peterson HSG4-24 - 24
    View R.H. Peterson HSG4-24 - 24" Ripped Split Oak Vented Gas Logs with Burner for Natural Gas Fireplaces. model PL-HSG4-24

    I just moved into a new home with a vented gas log fireplace. It has a pilot light and a switch that turns it on. The pilot is lit and everything seems fine if I do not turn it on. It is turned on by the switch. If I turn it on, the gas comes out and is quickly (two seconds) lit by the pilot light, however I smell gas (unburnt fuel?). The smell may or may not get worse over the first minute of being on, its hard to tell and then I turn it off. Is this simple or do I need a new log set?

    Answer: It is quite unlikely that what you are smelling is unburnt gas. When the logs are burning, the gas is burning. Several other things can cause your gas logs to produce odor:

    • Dirty chimney
    • Bird nest in chimney
    • Poorly drafting chimney
    • Dust on your gas logs
    • Improper installation - burner may be too far forward
    • Gas leak
    • Poor quality gas log set

    If the logs have not been burned for several months, dust accumulates on them and smells when it burns. You may want to open up your house and let the logs burn for half an hour. If you are uncomfortable with doing this, then contact your local gas utility company and have them come out and inspect your logs to see if there is a gas leak. You can also contact a fireplace professional to inspect the logs for proper installation. You should also have the chimney inspected. A poorly drafting or dirty chimney can be the cause. Even with gas logs installed, a chimney still must be swept regularly. Also, if you are testing the logs during the summer when it is warm or hot, your chimney may not draft properly...it may need to be cold outside to get a good draft.

    Here is a link to Locate Fireplace Professionals in your area.

    If you email me some pictures of your fireplace, I will be happy to take a peak and see if anything looks out of the ordinary or if you need to replace the log set. Email: gregt@hansenwholesale.com


  10. Question #8640 - Posted: 8/25/2010 11:53:55 PM

    Gas Logs Question

    View page where question was posted

    how do I know the size logs I need? Currently, I have vented logs , heat bar length 27 inches, current log length 23 inches, front of fire place 42 inches, depth 20 inches Your assistance is appreciated.

    Answer: The size logs you need depends on the type of control valve you select. Each control valve has a specific clearance requirement from the sides of the fireplace in order stay cool. If you use our website to its fullest extent, you can enter your dimensions into the calculator on any gas log page to determine which size logs will fit depending on the type of controls you select. This can be confusing for those who are not familiar with the various controls and gas log options, so I recommend that you call us during our normal business hours to talk to one of our gas log experts. See the bottom of every web page for your business hours.

  11. Question #8634 - Posted: 8/25/2010 8:03:07 PM

    Gas Logs Question

    View page where question was posted

    I have a wood burning fireplace in my master bedroom. It is a typical metal box with ceramic liners and a chiminney flu and finised by the builder with granite anround the front and floor. The room is large-- approx 18x18 with a vaulted 16 ft ceiling. Can I used a ventless gas log set in that fireplace (29"F, 20"R 14" D). I would have a professional install the gas line according to spec.

    Answer: Yes, you can use a Ventless gas log in a fireplace such as yours. Based on your dimensions, you will most likely need an 18" log set, but that really depends on the set you choose and the type of control you desire. Please give us a call and one of our Gas Log Experts will help you choose the right log set for your fireplace.

  12. Question #8624 - Posted: 8/21/2010 1:22:54 PM

    Gas Logs Question

    View page where question was posted

    what choices do i have ? I need natural gas 18" logs with elec. remote.

    Answer: Well, we are going to need more info about your fireplace in order to help you narrow down your choices. One of our gas log experts will give you a call in a few minutes to go over your fireplace dimensions and other necessary details in order to help you find the best gas logs to fit your particular needs.

  13. Question #8623 - Posted: 8/21/2010 1:11:16 PM

    Gas Logs Question - R.H. Peterson R.H. Peterson BDGX45-42SPK26P - 42" Royal English Oak Designer Vented Gas Logs with Burner for Liquid Propane Fireplaces. Model PL-BDGX45-42SPK26P

    View R.H. Peterson BDGX45-42SPK26P - 42
    View R.H. Peterson BDGX45-42SPK26P - 42" Royal English Oak Designer Vented Gas Logs with Burner for Liquid Propane Fireplaces. model PL-BDGX45-42SPK26P

    can you get ventless 42" propane logs

    Answer: 30" is the largest size that ventless gas logs come in. There are national building codes that restrict the BTUs a ventless product can use inside your home without being considered unsafe. The reason for the restriction is that the more BTUs a ventless product consumes, the more oxygen it depletes from your home and the more moisture it creates. When these things become to far out of balance, it is considered unsafe. In order to meet these safety standards, most 30" ventless gas logs actually use the exact same burner system as a 24" ventless log. So a 30" ventless log set will have the flame pattern restricted more to the middle of the logs...not the full width. Using a 24" burner on a 42" log set simply looks horrible and most consumers reject the look (it has been tried in the past and failed due to complaints). It is not feasible to make the burner wider, because the flames would not be seen coming up through the logs at all...even in a 30" vent free gas log. It has also been shown that anything larger than 30" is almost impossible to make without producing exhaust. When a gas log produces exhaust...the exhaust must escape from the home, so it cannot be ventless.

  14. Question #8617 - Posted: 8/20/2010 5:48:10 PM

    Gas Logs Question

    View page where question was posted

    is it ok to use gas logs in wood burning stove

    Answer: No, you cannot install a gas log in your wood burning stove, it is not safe or up to code. Wood burning stoves are designed to use a relatively small amount of air compared to what is required for a gas log. There is a potential that the gas will not burn completely and build-up until it explodes. Vented gas logs also require a larger vent than wood stoves have, and both vented and ventless gas logs require more space than a wood stove has on the interior. The installation manual for any wood stove sold over the last 10 or 15 years will clearly state to burn only wood.

  15. Question #8610 - Posted: 8/19/2010 9:38:24 AM

    Gas Logs Question

    View page where question was posted

    I have a never installed Sunbeam Gas Log Heater Model # UV-024. It is missing the three unattached logs (there is a large log that is attached to the main burner unit) and am also missing the embers. 24" Can I buy replacement logs for this model # even though Sunbeam no longer produces this product? Am I right to assume that I cannot use another brand's logs in this unit?

    Answer: Sunbeam is not a brand that we recommend or offer support for. It is a very low end brand that is sold mostly by mass merchants. You cannot replace your missing logs with any other logs than those that were made specifically for your gas log set. Using different shapes and sizes of logs that would be positioned differently over the burner system will most likely cause a ventless gas log to produce potentially dangerous exhaust...which makes them no longer ventless. You most likely will need to replace your entire ventless gas log set including the burner and logs.

Read more questions and answers here! >>

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