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The problem with this type of system is that it is really a luke-warm system. They range in price from a little over $330.

Like the previous systems, these systems also keep the hot and cold water lines full of warm water and thus waste tremendous amounts of energy.

There are a number of instant or fast hot water pumping/distribution systems on the market, and its important to choose the right system for your particular application.  This keeps the water at the valve at about 95 degrees.  Tankless water heaters require usually  gallon per minute or more to being flowing through the heater before it will turn on.Having instantly available hot water at the fixture when you reach for the faucet saves you not only time, but water as well.  The system pumps the hot water in a big loop, out of the water heater to the fixture, through the pump, through the cold water piping back to the water heater.

If saving water and being energy efficient are important to you then you will want to examine Demand hot water systems.00.  When the hot water reaches the fixture the pump shuts off keeping hot water out of the cold water pipes.  The pumps run for long periods too, so add that energy into the mix.  Typical systems use about $1.  

These systems will not work with tankless water heaters.

Metlund makes a system called a Dmand system with a number of models.  The pumps have very slow pumping rates.  

Lots of folks have fixtures so far away from the water heater that they turn on the hot water and go do something else instead of standing there waiting.

Instant hot water systems can even result in cleaner dishes!  The leading cause of dishwasher problems is that the water often is not hot enough to completely dissolve the dishwashing detergent.  The energy to heat water is much more expensive than the water itself.  As with the previously mentioned pumps, these systems can not be used with tankless water heaters for the same reasons.

Chilipepper Sales has a demand system called the Chilipepper Appliance. It will in fact work with any storage type water heater as well.  It can be a pain when the power goes off and the clock gets screwed up.

Demand systems deliver hot water rapidly to the fixtures upon demand.  That means they have been running hot water down the drain.  The Laing and RedyTemp systems dont pump enough water to turn on the heaters. When you want hot water you push a button, and the hot water is pumped at high speed to the fixture.  Since demand systems only run for a few seconds each time they are used, they use very little electricity.  Ninety five degrees is below the human body temperature so it actually feels like cool water. The Chilipepper Appliance has the most powerful pump on the market, and will work with any tankless water heater.

Some of these systems manufactured by Laing, RedyTemp, and others place a pump and valve combination at the fixture furthest from the water heater. These types of systems often include a clock China Compression Tooling Suppliers timer with them so you can shut them off when you arent going to use them. Metlunds largest Dmand system will run most tankless water heaters.  Watts makes a similar system but you only get to use one valve at one fixture.  When the valve between the hot and cold water lines detects hot water it closes.  By insuring your dishwasher gets hot water you will have sparkling clean dishes.00 to over $500, and have a number of accessories like using motion detectors to turn on the pump.  

Another type of system puts the pump at the water heater and a valve at the fixture furthest from the water heater.  The Chilipepper is the least expensive of the systems at $180.  The pump creates a pressure difference between the hot and cold lines, and so when the valves under the sink open the water flows through into the cold water lines and back to the water heater inlet.  Now you have instant hot water, nothing was run down the drain, and you didnt waste any heat energy keeping the pipes hot all the time.  When they return the water is hot.  You dont have to stand there running water down the drain while you wait.

One of the best things about having a demand hot water system is that whenever you use hot water, and you push the button to start the pump, you will feel so darned good about not running all that water down the drain.  This is a huge waste of energy and contributes to the emission of green house gases as well. The Grundfos system allows the placement of more than one valve, even one for every fixture if so desired. Some use pumps, some rely on thermo-siphoning, and not all systems will work will all types of water heaters.00 - $2. An instant hot water system eliminates this waste of course.  Since you are not starting with cold water and the pipe is full of luke-warm water, it wont take quite as long for the hot water to reach the fixture, but it certainly is not instant hot water!  

The pumping system is cycling on and off constantly all day long, and so it keeps the piping (both hot and cold) full of warmer than ambient temperature water.  This makes the water heater work harder, and uses significantly more energy than a standard plumbing system.00 per year in electricity for the pump.  The valves are temperature controlled and close when they detect that 95 degree water.