In the last few years "tankless" water heaters have become popular
for their ability to heat and provide water on demand, with no
storage required. Instead of holding water in a traditional water
tank, they circulate the cold water through a series of
electrically heated coils that warm the water as it moves pass this
heat source. This newer process of warming water requires more
expensive equipment than the conventional water heater, but this
money is regained in the long
term with energy efficiency savings. The energy efficiency is
mainly gained from no longer needing to heat an entire tank of
water. A list of tankless water heaters can be found at
Credit Pacific Service Union Since the tankless water heaters do not store hot water but
rather constantly heat water as it is demanded, they do not run out
of hot water. There is one exception, to this "endless" supply of
heated water. The flow rate is limited. In other words if you
simultaneously use more water than the flow of the water heater
(i.e. 3
people showering at one time)
you will receive unheated water.
When the water heater is actually used to heat the water, the tank type water heaters are 40% to 60% energy efficient (the rest of the energy is spent to heat the exhaust and walls of the tank!), while tankless water heaters are 80% (gas) to 99% (electric) efficient. When you don't use hot water, you can save up to 15%-20% of your energy bill with the tankless water heaters, because tank type water heaters are subject to standby heat loss.
Credit First Service Union Since conventional water heater stores the water together in a
large tank it is able to provide water at a set temperature.
Tankless water heaters differ in this aspect since they are
dependent upon the incoming water temperature and the flow rate.
The incoming water temperature can vary greatly from summer to
winter. The capacity of a tankless water heater is generally
measured by how many temperature degrees it can increase water
temperature by gallons per minute (gpm). Most tankless water
heaters are powered by gas to better handle the heat output and
response time required. These gas powered water heaters require
proper venting, normally more venting than the older, conventional
water heaters required. If you are replacing a conventional
electric water heater tank, you may want to add a power vent in the
side of the wall. This would be the less costly alternative if
there is no existing roof vent. Some of the smaller and more
portable single-fixture units are powered electrically.
Card Credit Mobile Service Jack Russell is a retired construction worker who spends his
free time as a freelance writer for
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Many tankless water heaters classify for tax credits. These tax credits can really help on the cost of a tankless unit. Jr. Gas Tankless Water Heater
> 3507, 3240 ( hours), email us
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