Wall-Vented Gas Room Heater Design

Long Beach Ed

We're all familiar with the wall mounted gas heaters that have their flue vent and air intake terminate through the wall. Smaller ones, like the "Perfection" brand used in these parts have no blower or electric draft-inducing blower.

How do these heaters differ from the old-style vented gas heaters that required a tall 3" vent? How do the wall heaters create draft necessary to push the combustion products out of the wall?

How does the design assure the production of combustion leave the building?

EBEBRATT-Ed

I don't claim to know but my brother has a direct vent State gas fired water heater that vents the same way a pipe within a pipe intake and exhaust. He has had it for 25 years. The first one lasted about 18 years. Unfortunately, the dimensions of the new one was slightly taller so we had to cut a new hole for the flue. But they work fine. No fan. Just 1 90 deg ell through the wall and out.

Long Beach Ed

I know the entire combustion chamber is enclosed and gets all air with the outside. Combustion might as well be occurring outdoors. There is no communication with inside air.

Maybe that's the major difference. This way there is no possibility of contamination inside the building, no matter what happens.

Old style heaters had a burner open to the indoor air and a water-heater-type draft hood. A lot could go wrong, resulting in combustion products staying inside.

Tim McElwain

They use a sealed combustion chamber. The only way out for flue products is thru the side wall vent.

Long Beach Ed

https://forum.heatinghelp.com/discussion/comment/1808277#Comment_1808277

Nice to hear from you, Tim. Just as I suspected. Hope all's well with you.