20 Most Recent Desa International GWP20T GLOWARM Wall Mounted Panel Heater Questions & Answers


I'm sorry to report there is no gas conversion for your DESA heater. In fact, no vent-free (vent-less) gas heating appliance (that includes gas log sets) is approved to be converted from one gas type to another. If you bought it from a retail store, exchange it for a LP Gas Model or a refund.

Hope this answered your question and thanks for choosing FixYa.

Desa... | Answered on Oct 27, 2015


Water flow combi will only pass so much , unless there is a blockage in the water section on your boiler, or water inlet tap is not fully open .

But some combis do have poor flow through the heat exchanger .

Desa... | Answered on Jan 29, 2013


I have several of these heaters in my rent houses and love them. The most problem I have is not being able to ignite the pilot with the user control igniter. Remove the screws that hold the front cover in place along with the front cover. Hold the pilot control down and ignite with a lighter. Keep the pilot engaged until thermocouple is warm enough to keep pilot gas flowing. If it will light this way then you need to blow out the pilot orifice. It seems that every year I have to go in after the summer season when the heater is off and clean the pilot/orifice lines with high pressure air. I believe spiders/bugs/dust block pilot orifice when it is not in use. You can also tell that orifice is blocked when you don't get a good blue pilot flame with pressure behind it allowing the flame to submerse the thermocouple. If the the thermocouple is not getting enought heat it will turn pilot gas off for safety reasons.

Desa... | Answered on Dec 31, 2012


Hello. The first thing I always do is brush down all of the components with a small brass bristle brush, available at any hardware store. Then vacuum up any debris. if there is any yellow in the pilot flame the pilot shoud be cleaned or you just have a bad thermocouple. thats what the pilot burns onto and it senses the flame thru milivolts. This is a common and inexpensive item, easy to replace. disconnect wires or wire like thermocouple and unscrew in near flame area...use a good strong flashlight so you can see clearly what you are doing. Joe

4 thumbs up please. ty.

Desa... | Answered on Nov 18, 2012


They need cleaning along with the injectors /lack of air .

Desa... | Answered on Nov 12, 2012


Mine did that. I solved the problem by cleaning the burner block with compressed air (non flamable) by blowing said air back through burner block(s) and be sure all dust is removed. The same can be said of the igniter. The trick here is to clean these types of units each year, at least! I nclean mine at the begining and end of each heating season.
I hope this helps, Sincerely, [email protected]

Desa... | Answered on Oct 16, 2011


From what you have described, it sounds like your heater has not been cleaned and serviced in quite a while. Further, the model number you listed is for an LP Gas blue flame convection heater, not an infrared heater like you described ("2 of the panel turned black and will not burn".

Which ever it is the solution will be the same ... The unit and the gas to the unit needs to be turned OFF and the front of the heater cabinet needs be removed, so you will have access to cleaning the interior and the mechanical parts. You will find sheet metal screws on each side of the unit and the top, that will have to be remove to remove the front of the heater. Using a shop vac with a hose and brush attachment, start cleaning the interior of the cabinet. Then move on to the radiant plaques if so equipped. Vacuum them carefully and the remove them and set aside, where you won't accidentally step on them. Now, you have access to the burner and the pilot assembly. Vacuum the burner thoroughly and also vacuum the pilot assembly. Switch to a can of compressed air with a straw nozzle (like you clean your computer with) blow out the pilot and the ODS Sensor (Please see link to your Owner's Manual,on how to properly accomplish this). After everything is thoroughly cleaned, reassemble the heater in the reverse of how you disassembled and remove the plaques. Turn the Gas ON, purge the air from the gas line by holding down the gas control knob, while in the PILOT position. Once you smell gas, release the control knob and wait 5 minutes before attempting to light the pilot.

To help you further, I have included a link to the Owner's Manual for your model DESA Vent-less heater model you listed. You can download and print it for future reference. http://www.desatech.com/manuals/Vent-Free%20Heaters/107884-01.pdf

I hope this helped you to solve the problem and provide Annual Maintenance to the unit. Thanks for choosing FixYa.

Desa... | Answered on Sep 21, 2011


You wont hear gas coming through until you depress the control knob. Otherwise try another tank. The ball valve may be stuck in the one you're using.

Desa... | Answered on Sep 02, 2011


Blow the thermocouple out with an air compressor while the unit is off. Another way to clean it is with a CO2 BB gun. Make sure it's not loaded! lol!

Desa... | Answered on Sep 02, 2011


With the description of when this noise occurs, indicates that there is a gas pressure and gas volume issue. The size of the gas line running to this heater may be the problem. It should be a minimum of 1/2" diameter. Especially, since you have two other major heating appliances sharing the same supply line.

The other thing to consider is does this occur when the outside temps are below freezing and is your Propane Tank buried or above ground? Also do you have a high pressure two stage gas system? If so, the secondary regulator at the house may be freezing and not allowing enough gas into the lines.

If the regulator is freezing ... soak a bath towel in hot water, ring it out and wrap it around the regulator as quickly as possible to thaw it out. Once it thaws it should remain thawed as long as gas is flowing. If it doesn't, your LP Gas Provider may need to add methanol to the tank.

Good luck! Hope this solves your problem.

Desa... | Answered on Jan 26, 2011


well, these heaters are typically thermostat-bound, and I have found that they simply will not burn continuously, like a blue-flame heater. Try turning up the setting--this will make it come on/off more often, effectively heating at least one med-lg room, and partially for adjoining areas. Keep in mind that these only rated for 700-1500 SF--that is NOT the floor measurements, but square feet of airspace; eg., a 10' x 15' room has 10' x 15' x 8' (8 foot ceiling) =1200 sf. That said, My 15k btu wall unit had been the sole heating source for my entire home for 5 years, until last year, when I acquired another smaller unit. However, I typically only use a few rooms, and shut off unused areas (ya, was 'cool' in unused back room areas).

Desa... | Answered on Jan 19, 2011


Hi. Thanks for your question.
  1. Remove the screws that hold the front cover in place along with the front cover. Hold the pilot control down and ignite with a lighter. Keep the pilot engaged until thermocouple is warm enough to keep pilot gas flowing. If it will light this way then you need to blow out the pilot orifice. It seems that every year I have to go in after the summer season when the heater is off and clean the pilot/orifice lines with high pressure air. I believe spiders/bugs/dust block pilot orifice when it is not in use. You can also tell that orifice is blocked when you don't get a good blue pilot flame with pressure behind it allowing the flame to submerse the thermocouple. If the the thermocouple is not getting enought heat it will turn pilot gas off for safety reasons.
  2. Or the oxygen depletation sensor has failed. When it fails it cuts all gas flow as a safety precaution. Because the sensor is built into the gas flow control it is not servicable and requires a replacement. These are the weak point on all ventless gas heaters and fireplaces.
I hope this helps you out.
Thank You for using FixYa.

Desa... | Answered on Jan 18, 2011


yellow flame is caused by low o2. so open air shutter or lower gas input. that said if flame is equal across burner.a normal gas pressure to the burner is 3.5 " w.c. there should be a test port on outlet side of valve. the name plate will tell you what the pressure should be.

Desa... | Answered on Jan 04, 2011

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