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The stand-alone storage heater is the most common water heater in use today. It is typically powered by natural gas, liquid propane, or electricity, depending upon which of these energies is available and most economical. There is something nice to be said for 35 or 50 gallons of hot water being always at the ready for showers, baths, laundry, or dish washing. The downside of these heaters is exactly that which is so nice about them: 35 to 50 gallons of water which is always kept hot whether it will be used or not. In warm climates or ho weather, hot water usage can drop quite low. It seems counter-intuitive to be cooling the entire house while simultaneously heating water in the water heater.
The tankless or on-demand style of water heater offers a viable option to the storage water heater. This type of heater can be used in a number of ways to meet a household’s hot water demands. As the name implies, there is no tank of hot water to be kept warm. Instead the water is heated as it passes through the heater. Only the water that is drawn through the unit is heated. When the hot water tap is turned off, the heater powers down either to off, if it has a piezo ignition system, or to a pilot light. Energy is primarily consumed doing the time of actual water usage.
The best tankless heaters run on gas - either natural or liquid propane. The electric units available do not deliver high water volume and generally are relegated to sink and kitchen use. Gas units range from large volume household units (still very small in physical size) to lower volume units for smaller places. Several lower volume units can be located strategically around the home to provide close, on-demand supplies of hot water. This works best when planned into a new home so gas sources can be appropriately located.
A tankless water heater can save a home owner 15% or more per year on hot water energy costs. This savings, along with the smaller size and lower carbon footprint, make tankless water heaters something to consider.
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It depends on usage.
Is there such thing as a tankless water heater?
Yes, tankless water heaters provide hot water on demand. They reduce energy consumption because energy is not used to keep water hot like in a normal water tank.
You are constantly running out of hot water and have no room for bigger water heater what should you do?
Take shorter showers, or get a tankless, "on-demand" water heater that heats the water as you use it.
What is the purpose of an on demand water heater?
Tankless or "demand" water heaters are a useful energy efficient alternative to having a tank water heater. It is a smart alternative because it heats up the water as the sink, shower, or other hot/cold water using device needs it instead of having to fill up the whole hot water tank which saves you a load of money.
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If an instant, on demand water heater is to expensive or for some reason not an option for you, look into solar.
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How come the hot water only lasts for 30 seconds but when it gets turned off and back on there is another 30 seconds of hot water?
This is likely due to the hot water tank being small or unable to keep up with the demand for hot water. When you turn off the hot water and then back on, the tank has a chance to replenish the supply of hot water, giving you another 30 seconds of hot water before it runs out again. Consider upgrading to a larger tank or a more efficient water heating system if this is a recurring issue.
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This depends if it is a high or semi pressure system, as well as if it might be a gravity fed or an "on demand" type water heater.
How long does it take to get hot water out of your hot tap and how much water does it use to achieve that?
There is no "one" specific answer to this as it depends if it comes from an "on demand geyser", "gravity fed geyser" or "high pressure geyser" and the distance between the geyser and the tap
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