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Pepperbilly
Samba Member
Joined: April 08, 2017
Posts: 1090
Location: Seattle, Wa
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 Posted: Wed Aug 13, 2025 4:45 pm Post subject: Gas Heater Output |
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Today because I had nothing better to do I decided to check my gas heater output temps. I have never seen data for this in any heater manual. Using a temp. probe on the driver’s side floor vent I guess I was a bit shocked at the high numbers. Engine at idle with the dash control at the lowest setting I constantly saw temps. in the 140 degree F range. Dash control knob at high…knob all the way clockwise I saw temps in the 250 degree F range. I have always been proud of my gas heater working well but is this what is considered normal?
Dash knob at highest setting
Dash knob at lowest setting
Bill |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 23234
Location: Oklahoma City
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| Posted: Thu Aug 14, 2025 8:12 am Post subject: Re: Gas Heater Output |
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Oh yes!....kind of! 
The difference is....what is your ambient temperature? It does not take much to get already warm air even warmer. Also, if the car is stationary vs running with higher rpm and airflow moving through the ducts to take that heat away you can get high readings.
But, peaks of heat that high at the outlet vent should only be for a handful of seconds at a time because the temperature switch down in the duct near the rear wheel on the driver's side should have cut off fairly quick and you are the pumping residual heat out of the chamber.
If you have had any fuel pump volume issues and maybe are running high volume, it can cause slight heat blooms. Ray |
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Pepperbilly
Samba Member
Joined: April 08, 2017
Posts: 1090
Location: Seattle, Wa
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| Posted: Thu Aug 14, 2025 10:56 am Post subject: Re: Gas Heater Output |
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| raygreenwood wrote: |
Oh yes!....kind of!
The difference is....what is your ambient temperature? It does not take much to get already warm air even warmer. Also, if the car is stationary vs running with higher rpm and airflow moving through the ducts to take that heat away you can get high readings.
But, peaks of heat that high at the outlet vent should only be for a handful of seconds at a time because the temperature switch down in the duct near the rear wheel on the driver's side should have cut off fairly quick and you are the pumping residual heat out of the chamber.
If you have had any fuel pump volume issues and maybe are running high volume, it can cause slight heat blooms. Ray |
Ambient temps were in the low 80s but the car was in a cooler garage, but not by a whole lot.
The heater was regulating itself. Output temps would peak as mentioned and then come down. Pretty happy about that. That part of heater operation seems to work fine. What worried me were the 250 degree temps at the high end. My system is totally stock so I guess all the connections, tubes and flaps are designed to endure this. Yeah, this was a non driving test at idle. Anyway, it always amazes me that this gas heater works so well. Consider myself lucky. 
Bill |
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