Propane are the best, they throw out a lot of heat
Solaira All-Season Quartz Patio Heater is the brand that recent comparison tests favor. http://www.consumersearch.com/patio-heaters
You have a great patio that you want to continue enjoying as the evenings begin to cool. Outdoor heaters can make the happen. Heaters can be natural gas, liquid propane or electric. Electric models are usually the best option for homes that do not have an outside gas or propane connection. Determine which size best suits your particular needs. Compare the size of the heater and the area that it will warm. Larger units heat more area but are also more expensive to purchase and to operate. With a little research you can find the right heater for your needs.
The best brand of ventless propane heaters include, Mr. Heater which offers 250,000 to 400,000 BTU. Another one that is highly recommended is one called the Hero which offers 30,000 to 60,000 BTU and is also cordless.
The best electric heaters can be purchased at a local big box hardware store. There are many to choose from including Rona, Home Hardware, Home Depot and Totem. One can also purchase electric heaters directly from the manufacturer of choice.
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Some of the best rated brands of electric stove heaters include the Dimplex Electric Flame stove, the Merlin Electric Heater Fireplace and the Bionare fireplace Heater stove.
High temperature, non-flammable.
One of the best electric hot water heaters on the market is Reliance Lowboy and Reliance 80 gal. The are sold at Ace Hardware. There is a web site that rates hot water heaters and that is Heater.Housekool.com They list all the top rated electric and gas hot water heaters.
The cheapest propane heaters could be found at various suppliers and supplier websites such as AliBaba. Most of the cheapest options are usually manufactured in China, so it best to choose wisely as many could come with faults that could lead to serious injuries or even fatality.
Some of the best energy efficient electric heaters are those manufactured by Holmes, Cadet, Power Star, GE, Amana, and Bosch. Simple units cost from $50-$300 for these brands.
When it comes to heaters, electric versions have not had the best reputations in the past. They have been known for sucking electric and being major fire hazards. Thankfully, for the most part, those days are over. The newer versions of electric heaters that have been put on the market are a very energy efficient way to heat your home or office. Furthermore, thanks to quality standards that have been majorly changed in recent years, electric heaters are no longer as risky to use indoors as long as you follow safe using guidelines.
A propane generator is the best way to go if you want no fumes. Gasoline heaters can have nauseous fumes and containers of fuel can spill or leak. Propane has a much longer shelf life then gasoline and can be bought in times of power outages when gas stations may not be able to dispense gasoline.