Restaurant and bar supply retailers would be a possible place that you could purchase a hot strip heater. Web restaurant store has their own website which would be your best bet for purchasing a hot strip heater.
One can purchase strip heaters from a variety of stores. Stores such as ZORO Tools, Sears, Amazon, Omega Engineering, and Hatco Corporation sell strip heaters.
GE hot water heaters are made by Rheem.
Most stores that sell hot tubs will also carry hot tub heaters. Look for these in places such as Canadian Tire or at retailers that specialize in hot tubs.
Generally most hot tub heaters reach a maximum of 104 degrees Fahrenheit. Hot tub heaters are regulated to prevent excessive heat from harming our bodies. The following is a website that has a lot of detail about hot tub heaters. http://www.ehow.com/about_5031765_temperature-should-hot-tub.html
You can purchase water heaters at any home improvement store like Lowes or Home Depot.
Several household appliance stores also sell propane heaters. You can also purchase propane heaters online.
Hot wire strip heaters are used for usually sealing two pieces of poly together to form a bag or band around an object. Due to the variable types of poly used and different manufactures specifications , one heat can not be used for all occasions. There is a thermostat that is added in line with the hot wire to control the temperature of the wire. This thermostat limits the heating of the wire so as to get the melting point of the poly just right. If a strip heating wire is left full on it will get red hot and usually burn itself up. Nickel chrome wire has a melting point of 1400 degrees C.
Monitor heaters can be purchased through many online retailers. The following are examples of good online retailers to purchase monitor heaters from: MonitorHeaters and MonitorHeat.
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American Water Heaters
You can buy water heaters from any home hardware store.
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.