It has to do with modern technology, along with the size of the heater versus the size of the room, how tight, etc. The old heaters didn't have low oxygen sensors with automatic shut-offs like they do now - and due to that, weren't considered safe to use in many places. I've got half a dozen of the unvented heaters (Procom) and have had zero problems with any of them. Granted, I only use them for spot heating. I heat our home with a wood furnace, but . . . it's nice to have these heaters when you want one area to be warmer than others. Also nice to have during a power outage if you don't have a backup. All the ones I have, have mechanical thermostats, use no electricity, no outside venting, etc. Come in two styles, visible flame and infrared catylitic. The latter type really throws heat at distant obects and warms before the air gets warm. We have a 28K unit in several large rooms, and our three bathrooms each have 6000 BTU units. Neither me or my wife have ever noticed any fumes or odors, other than the slight smell we get from any LP device. We have two LP cook stoves, both with pilot lights. I notice them more then the heaters. When on-sale, you can buy a 28K BTU thermostat controlled heater for $179, and a non-thermostat controlled with three heat settings - for $159. I think they are bargains for what they do.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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