Demand Water Heaters

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If you are looking for ways to cut your energy costs, consider having demand water heaters (also called tankless water heaters) installed in your home.  A standard tank type water heater wastes energy by keeping water hot 24 hours a day whether it will be needed soon or not.  The energy wasted keeping water hot during period of no demand is called the standby energy loss.

Demand or tankless water heaters eliminate the standby energy loss by only heating water as it is used.  When a faucet is opened or a shower is turned on, the water runs through the heater where it is heated  and then delivered to the tap.  The heating process only takes a few seconds so the supply of hot water is almost instantaneous.  However, just like with a standard tank type water heater, if the tankless water heater is located some distance from the tap it will take a little time for the hot water to make its way there.

The main advantages of tankless water heaters are the elimination of standby energy loss and an endless supply of hot water.  The primary disadvantages are a higher initial cost and a limited flow rate.  The limited flow rate can be a problem if multiple demands for hot water are made at the same time such as running the dishwasher and the shower.  If the demand exceeds the unit’s flow rate, it will not be able to keep up.  One way to deal with this problem is to install multiple demand water heaters that are dedicated to the heavy users of hot water like the washing machine, shower, and dishwasher.

The cost issue becomes less of a concern when you consider that the demand water heater is far more efficient than a storage type water heater.  In the long run, the energy savings will offset the increased initial cost.

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