The traditional type of water heater is one that holds a tank of water and heats this water for use whenever it is needed. This hot water sits in the tank and when it is used, more water is added in order to heat it for more uses down the line. This way there is always hot water on hand. The On Demand Water Heater makes this same hot water available but without the huge water tank. These units involve a water pipe going through the On Demand Water Heater and an electric element or gas burner will heat the water as it flows through.
This process of the On Demand Water Heater gives hot water only when it is needed. This will avoid the heat loss that you get from the traditional type of water heater. This heat loss is from the water sitting in the tank and not being used. When you start your faucet on hot water, you will feel cold water come out first and then hot water shortly thereafter. This is the heat loss that the On Demand Water Heater will eliminate. With this unit, you will turn on your hot water tap and actually have hot water on your first drip.
Getting rid of this heat loss is a major benefit of the On Demand Water Heater but there also is a drawback to having this type of unit. If you have a large family and there is a lot of consumption of hot water throughout the day from washing dishes or taking showers, this heater will be pushed to its limits. These units typically will supply two to five gallons of hot water per minute. The gas fired units will produce more than the electric units but with the constant use, even the largest On Demand Water Heater will have trouble keeping up. Installing two units will cure this problem.
Rheem is a very popular brand for purchasing an On Demand Water Heater. A popular model that they make available is the Rheem EcoSense On Demand Water Heater. This water heater is a direct vent indoor gas tankless water heater that will cost around $845.33 depending on the supplier that you purchase it from. This model has continuous hot water, it is very compact and has an energy efficient design as well as a precise temperature control. It would be the perfect water heater for a medium size family that will get the job done.
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