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Posted: Saturday, August 26, 2017 8:36 AM

Tankless water heaters are quite popular as of late, yet many people don't really know what the differences are between a standard storage type water heater and a tankless water heater.

Storage or Tank Type Water Heaters

Let's begin with storage type water heaters. Basically you have a big pot of water (water heater) over a hot fire (burner or electric heating element). A thermostat turns the flames on when the water gets cold and off when it reaches the desired temperature. When you want hot water for something there is a big pot of it just waiting for you to turn on a hot water faucet, and the hot water is on its way.

When the flames are turned off, the tank will begin to slowly cool, even if it is well insulated, just more slowly. The water in a storage water heater is always changing temperature, it's either being heated by the flames (or by an electric heating element), or it's cooling off. The outlet water temperature can vary widely. A water heater with the thermostat set to turn on when the temperature of the water drops to below 120 can reach temperatures of over 160 degrees due to stacking.

As the user of the hot water you probably don't notice the difference in actual water temperature. You are usually using a mixed flow of cold and hot and just adjust the water flows for the temperature you desire.

As you use the hot water cold water is flowing into the heater and after a while the temperature begins to drop until it's no longer considered "hot" water.

Tankless Water Heaters

Tankless hot water heaters are quite popular these days . Tankless heaters don't have a big tank full of water cooling off all the time, so they don't have standby losses.

They won't run out of hot water either. If you need a continuous supply of hot water and a storage heater won't handle it, then a tankless water heater may be the preferred choice. The alternative I suppose would be to use multiple storage heaters.

Heating water on the fly is much more difficult than it first looks. Rather than a big pot of water you now have to picture a coil of copper tubing (heat exchanger) in the flames (burner or heating element) with water flowing through it.

It sounds simple, but consider what happens if you put the copper tubing in the flames without running water through it. It melts. Ok, so we run water through the pipe. If we run the water too slowly it turns to steam in the pipe and possibly blows the pipe up. If we run the water through the pipe too quickly then the water doesn't get very hot.

Changing the size of the flames has the same affect as changing the water flow, the lower the flame the longer it takes to heat the water.

Tankless water heaters therefore have valves to adjust the size of the flame (or the amount of electricity being directed to the heating elements) and/or the amount of water flowing through the heat exchanger.

They also have a flow switch that turns the heater on only if a minimum flow rate is achieved... typically 1/2" or 3/4 gallons per minute. That way the heat exchanger won't melt from overheating. If you try to use too high of a flow rate then your water won't reach full temperature.

Tankless water heaters have temperature monitors at the inlet and outlet, and for gas models, in the exhaust stream. Tankless gas water heaters also monitor gas flow and/or pressure or both.

As you can imagine, tankless heaters are far more complex than a standard storage type water heater with temperature sensors, flow sensors, multi-speed fans, remote controls, and even microprocessors built into them.

Because there is a minimum and maximum flow rate one has to choose the set point outlet temperature carefully. If the temperature is set too high, then you will have to mix a lot of cold water with it to take a shower. But if you have to use a large percentage of cold water to reduce the temperature then the hot water flow can drop below the minimum flow rate for the heater and the heater shuts off. You find out when the cold water finally reaches you in the shower.

If you set the temperature too low then you will possibly exceed the capabilities of the heater to deliver full temperature water. With these heaters you cannot get a small stream of warm water since at the minimum you will need to run at least 1/2" gallon per minute to keep the heater on, but that will be full temperature. To reduce the temperature you will have to increase the flow of cold water. Not a good way to practice water conservation. Hot Water Tank

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Tankless Water Heater : A Primer for Contractors, Installers, Builders and Homeowners.
Tankless water heaters have gained popularity in the North American market for the past 25 years.
They come in a variety of capacities to meet different needs such as supplying water for a whole house, a hot tub, a remote bathroom or a single sink.
Compact in size, tankless water heaters can be mounted on a wall, allowing them to be installed in a wide variety of spaces.

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Can you give me your opinion and any information you may have on using a tankless hot water heater?
I presently have a gas-fired hot water tank, and I have to replace it every seven to eight years because of hard water.
Can the tankless hot water heater be connected to gas and or electric?
The price is not bad and they appear to be efficient.
Do they reach the needed temperature for dishwater use?

A tankless water heater is a wall-mounted unit that only comes on to heat the water when a faucet opens looking for hot water.

Because you are heating water as you need it, it is "tankless," also called instantaneous.

They work beautifully and are made of stainless steel, so they last.

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If you're debating replacing your hot water heater with a tankless version, also known as an on-demand water heater, here's what you need to know...
The question that is being asked is
Why should I trade in my Tank water heater for a Tankless?
The answer is very simple: By replacing your tank with a tankless heater you can enjoy the benefits of saving up to 60% of your hot water heating bill. This is possible because the only time the tankless water heater is turned on is when someone turns on the hot water faucet.
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Continuous HOT water ALWAYS regardless on how long you leave the faucet open or how many people take shower simultaneously...even if there is no power, you'll still have hot water because they run on batteries.
Tankless water heaters are just what their name implies: they heat the water you need to use on demand, rather than heating water stored in a tank and letting it wait to be used.
Tankless heater just uses energy to heat water when required and this is how it becomes SO energy efficient.
This means, tankless option is a far better choice than tank-type heaters because it is efficient and will lower your utility bills along with causing minimal environmental damage.
Thus, going tankless seems like the perfect choice for all!

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