Posted by jdemaris on November 03, 2010 at 17:16:48 from (67.142.130.35):
In Reply to: Re: heaters posted by Stuart on November 03, 2010 at 16:44:01:
The amount of heat-loss in a room has nothing to do with the efficiency of a heater. You might include such facts if evaluating thermal efficiecy of an entire house, but not the heater.
In regard to exhaust temp??? Define exhaust. A fuel burning heater that is vented through the wall or a chimney, loses heat-energy to the out-side world - and that is usually called "exhaust." The more heat that leaves, the less that gets used to heat the room. If 10% of the heat goes up the chimney,and 90% goes to heat the room, it's going to be rated around 90% efficiency. If 30% goes up the chimney, and 70% heats the room, it's 70% efficient. The most fuel efficient heaters or furnaces that ARE hard-vented, tend to run very low "exhaust" temperatures. But, with such high efficiency also come reliability issues. So, many are built on compromise.
Note, the non-vented heaters don't exhaust heat directly to the outdoors. So, technically, they have no "exhaust." That's why they are often rated up around 99% effeciency.
The temperature a heater has to get in order to heat a room has nothing to do with anything - within the context of heater efficiency. It has to get warm enough to reach what ever temperature you call for. It has to have enough BTU output to compensate for heat-loss in that room - and that heat-loss has nothing to do with the efficiency of the heater. Ask your HVAC brother to explain it to you. To get a room warm, you have to pump in enough heat to compensate for heat that is leaving it.
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