Hot Water Gas Heaters
 2 HP 115v PORTABLE CONTRACTORS AIR COMPRESSOR  US $295.50
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 Eemax Single Point Tankless Water Heater SP3512 US $94.26
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 15 HP 115 VAC 57 CFM AIR COMPRESSOR US $185.50
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 Olympia Tankless Hot Water Heater Whole House Tank Less US $225.00
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 RHEEM COMMERCIAL ELECTRIC WATER HEATER 40GAL ELD40 B US $499.98
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 American Water Heater 40 Gallon Residential Electric US $283.20
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 American Water Heater 50 Gallon Residential Electric US $298.10
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 Instant Hot Water Heater on Demand US $80.00
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 BOSCH PowerStar AE125 Electric Tankless Water Heater US $295.00
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Other types of water heaters
Hot water gas heater is not your only option. There are several other heaters, you can use where gas supply is not readily available. For example electric water heater is in high demand and many people prefer electric to gas. However, gas water heaters are still the most popular and majority of people who buy heaters, buy gas water heaters.
Instant hot water heaters
A recent invention is a tankless water heater. This type of heater brings you hot water the moment you turn the tap on. As the name suggests tankless heaters have no storage tank for water, they heat it as you use it. They are also called instant heaters. This is very much appreciated by many people because now they can take bath anytime without having to worry of switching on the geyser 20-30 minutes ahead of time. Also if many people take a shower one after the other, an instant water heater is a great advantage - you will not run out of hot water.
Solar water heaters
Solar water heaters are also a great advance in technology. With light capturing panels installed on your roof, solar heaters use the sun as an energy source. So in theory, solar heater is free all together, apart from the initial installation cost. However, the initial cost is very high. And also if there are several cloudy days, your solar water heater stops working.
And still most people prefer gas water heaters, because it is simple and also economical. It is really much cheaper than any of the electric or solar heaters, including tankless varieties.
Gas water heater disadvantages
There are some drawbacks to gas hot water heaters. First, compared to electric heaters they are slow. Second, you can only use natural gas heater where there is gas supply. But on the bright side, if you want your water cooler, you can turn gas heater down straight away, and get the exact temperature you like.
Over all, it looks like a gas hot water heater is still the best choice for most families. Modern technology is good, but good old gas is proven to be the best.