Save Water, Energy & Time

Economical, easy-to-install recirculation systems from Metlund and Laing cut the wait for hot water.  Long waits for hot water are more than just irritating - they cost money and waste water and energy. The average family can easily run 10,000 gallons or more down the drain every year. There's a simple and inexpensive way to solve this problem in your existing home or avoid it in your new home: an instant hot water system.

As you can see in the diagram , there is 

no need for a dedicated recirculation line.

  • the convenience of nearly instant hot water throughout the house
  • substantial water and energy savings year over year
  • easy installation with most existing plumbing systems
  • silent, maintenance-free operation

The problem of course is that water heated by your water heater sits in the line between the heater and the tap(s) where it cools off. Let's call this "previously hot" water. When you turn on the tap you need to flush out this previously hot water to get to the fresh hot stuff. With low-flow faucets and long plumbing runs, this can take a long time - and waste a lot of water. And it can cause problems for your appliances too - forcing washers and dishwashers to use more time and energy heating their own water (or worse, run with water not hot enough to clean). An instant hot water system - or hot water recirculation system - flushes the previously hot water back into the hot water tank (rather than you running it down the drain) so you have freshly heated water waitingfor you when you turn on the faucet - instant hot water. Most instant hot water systems use the same basic approach - a special pump flushes previously hot water from the hot water line, sending it back to the heater through the cold water line.

Yes, you can use a recirculation pump with a tankless water heater. A tankless water needs a minimum flow before it will turn on. That's why you need a stronger pump, and there is only one brand we recommend for that purpose - Metlund.

If you have a dedicated recirculation line, you have more choices. You can use a pump that is designed for an non-dedicated return, or you can use a pump that runs almost continuosly (this will use more heat energy). A good compromise is to use a Laing pump with a timer module. The timer would be se to run when you expect to use hot water - mornings and evenings perhaps.

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Hot Water Recirculation Systems

Hot Water Recirculation Pumps - NON TANKLESS

Multiple styles of pumps for tank type water heaters.

Hot Water Recirculation Pumps - FOR TANKLESS

Larger pumps for very long pluming runs and for tankless water heaters. Some pumps are timer operated and others via on-demand buttons.

Solar Hot Water Recirculation Pumps

Solar (DC voltage) powered pumps for hot water recirculation and general duties.

Thermal Expansion Tanks

Diaphragm type thermal expansion tanks. Protect hot water systems from over-pressurizing.

Differences between systems

Differences lie in how the systems are activated and how fast they work. The Laing AutoCirc1 performs a flush whenever it senses the water temperature has fallen below a certain level; the Metland D'MAND systems are, as the name implies, "on demand" - a high-speed flush is triggered by either button or motion sensor. With the Metlund and Laing AutoCirc1 systems, the pump installs at the most remote fixture (at the end of the plumbing run).

How much do instant hot water systems save?

Water savings for a household of four occupants varies from about 900 gallons to about 3000 gallons per point of use, per year (DOE study). Point of use is a single location at a home, for example a faucet where hot water is available. The water savings in a home with four points of use, on the average, would be 3,600 to 12,000 gallons per year. So, conservatively, if your home saved only 20 gallons of water each day (7,300 gallons per year) then in one year you could save between $100 and $200, considering water, energy and sewage charges.

Usage considerations

Once installed, these systems are quiet, dependable and maintenance-free. Laing provides a 2 year warranty on their units (from the manufacture date or 1 year from the purchase date, whichever is greater) while Metlund provides a 5-year warranty. The Metlund systems are activated by users and so household members need to adapt their habits a bit (basically you just learn to hit the button as you walk into the bathroom).

Physical placement

The pump units are located at the last fixture on your plumbing run (for example under a sink). If you are not sure of the layout of your plumbing, try following the pipes from the heater if that is possible - or call a professional plumber.

Plumbing requirements

These systems work with most typical residential plumbing configurations. However, there are a few considerations. First, if you have a tankless hot water heater, you must go with the largest Metlund system, the S-02. This is the only system that can work fast enough to keep up with your tankless heater. Second, if you have determined that your home has more than one plumbing run (a branched system) you will require multiple units (one for each branch).


why buy from us?

We're engineers passionate about home ventilation and serious about customer service – so you can count on us for carefully-selected equipment and expert advice to ensure your project is a success from specification to installation.

Your call is answered by qualified people who will gladly discuss your project in detail, advise you professionally and never sell you inappropriate products.