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100% in my experience of using them for 16 years. I have installed dozens in my rental units and have used them in a space as small as a cargo van with absolutely no negative experiences.
These heaters are 99.9 efficient, which is why they don't need a vent.
But they do use oxygen from the room so each one is equipped with an over-sized pilot light which is fed by a controlled orifice. If the oxygen level in the room drops significantly the heater automatically (and purely mechanically - no electricity is required for the operation of these units) shuts the pilot light off, which shuts the heater down.
See Also: How Efficient are Vent Less Heaters?
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Is a direct vent water heater as good as a standard vent water heater?
a direct vent water heater is more fuel efficient (cost's less to operate). aside from that there isn't much difference, aside from not needing a double wall flue through the roof on a standard gas water heater.
Is there a highwind vent cap for a gas hotwater heater roof vent?
YES
Can a gas water heater be installed in a bathroom?
yes there are direct vent gas water heater available Absolutely NOT
What type of vent pipe be used to vent a gas water heater through a ceiling and roof?
B-vent pipe.
What's the best style outside gas heater?
You can try the Vent-Free Infrared Gas Heater taht is made for patios.
Can you covert to gas heat from electric heat?
I'm not sure what you're asking. If you're asking if you can put a gas heater where an electric heater is, the answer is yes, assuming gas and vent availability.
What is the difference between a power vented gas water heater and a standard gas water heater?
The difference between a mobile gas water heater and a standard gas water heater is that a MH unit will use an outside air intake for combustion. That is the most important difference.
Can you direct vent any gas hot water heater?
No. Gas water heaters are not all designed to use direct venting.
How efficient are vent-less gas heaters?
Unbelievably efficient. I have been using them since 1995. I have purchased more than 20. They are 99.9 percent efficient, which is why they don't need a vent. A 15,000 BTU Unit (that has 3 plates) uses less than a dollar an hour worth of propane and probably something on the the order of 70 cents worth of natural gas per hour. You do have to select which gas source you intend to use before purchase. But you don't normally run the heater at full output. Once a room is heated you set the heater on low and then it uses just pennies per hour worth of fuel. I have owned and installed about 15 in the mobile homes and site built homes that I previously rented to tenants and I've purchased a number of portable units for camping. See Also: How Safe are Vent-Less Heaters.
Can you vent a gas heater through the wall of a garage?
Check the code for your area. Most I have seen go through the ceiling.
Which space heater is the best for me in order to avoid blowing the fuse on my circuit breaker (in other words, which has enough heat with the least power use)?
You can avoid that problem all together with a gas heater like Desa International GWN30TA Vent-Free Gas Space Heater
What are the advantages of using a gas water heater?
At current gas prices they cost less to use and a gas heater gives you a much greater supply of hot water on demand.
