Kozy World propane wall heater

You can try the maker or the other retailer.

http://www.comfortglow.com/

Comfort Glow CGS379 30,000 Btu Blue Flame Propane(LP ...

https://worldmkting.com > comfort-glow-kwd379-30-0...
This 30,000 BTU Propane(LP) & Natural Gas(NG) heater provides convective heat for the best whole room heating, up to 1250 sq ft. This heater is 99% fuel ...

• 
  

  Comfort Glow KWD326 18,000 Btu 3 Plaque Propane(LP ...

  https://worldmkting.com > comfort-glow-kwd326-18-0...
  Comfort Glow's dual fuel, 3 plaque, 18,000 BTU thermostat controlled heater can be used with propane (LP) or natural gas (NG), and will heat a room up to ...
  
  

Which model?... natural gas or propane?

That's no good. That's an indication that there's not enough air or too much gas going in the combustion mixture. Blue flame with orange tip is ok, but not yellow. For complete combustion, you need10 cubic feet of air for every cubic feet of gas. The pressure at the manifold for natural gas is 3.5 w.c (inches of water column), and propane is (LP gas) is 11"w.c. This has to be checked with a manometer.

Yes, it sounds like the third heater has a Control Valve problem. It's allowing more gas into the system than what it's supposed too. Have you tried turning the flames down to a lower setting? If so, did it lower the flame height? How old is this heater and is cleaned and serviced at least annually? Are you using Natural Gas or Propane?

Please get back to me with the answers to the above questions and I may can help you.

Thanks,
Rich

this is happening because the bricks need cleaning. I imagine the flame is burning blue instead of glowing red in the middle brick. Contact your local propane or natural gas dealer about getting the heater cleaned. This type of problem causes a huge loss of efficiency and could be dangerous.

I WOULD JUST DOUBLE CHECK THE WIRING TO THE THERMOSTAT AND THE HEATER, , WOULD BE MY GUESS, IF IT WORKED FINE BE FOR, THERMOSTATS DO GO BAD, BUT I WOULD CHECH WIRES, ALSO YOU MAY BE ABLE TO CROSS THE TWO WIRES AT THE THERMOSTAT TO CREATE A DEMAND FOR HEAT, BY PASSING THE THEMOSTAT YOU WILL KNOW IF THE PROBLEM IS AT THE THERMOSTAT OR HEATER GOODLUCK

kozy world KW112, 1 burner is dim flame 2nd flame is bright red. What is the problem?

weak pilot flame: should wrap around therocouple.
blue flame with yellow tip not yellow and lazy.
if flame good replace thermocouple

I have the same htr in Mich. & have worked on gas htrs.for many years.
Does the flame go out when you let go of the button to lite it?
If it does, then the thermocouple is bad.

If the flame stays on, but goes out when you turn the dial,
the gas regulator is bad.

Probably a little more expensive to buy new then to fix it.

Michael.