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Summary: A hot water recirculation system can give you instant hot water, but you must mind some important safety tips! Follow this guide for proper installation of your recirculation hot water system.
Toronto Hot Water Recirculation Toronto Hot Water Tips:
How it Works
When water is heated, it simply gets lighter. It wants to float to the top of cooler water. Cool water wants to fall. If you have a loop that projects upwards, the cool water wants to fall down the loop while the hot water goes up. Gravity fuels the motion.
It works in this fashion in your house. You already have half of the loop in place. This is your hot water piping distribution system which begins at your hot water heater and ends at the farthest fixture which requires hot water. If you were to install copper piping leading back from the farthest point and from other high points in the existing system, you would have a loop. This return loop connects into the bottom of the hot water heater where the current drain valve is located. It is that simple.
The flow of water through the loop is very slow. However, that doesn't matter. The only thing that is important is that hot water is near each fixture. Without a loop there is no movement, so any movement is better than none!
Toronto Hot Water Recirculation Toronto Hot Water Tips:
Non-Gravity Systems
Those of you who live in a house on a slab or where a majority of the hot water lines drop below the heater need to use a recirculation water pump. These are simple devices that connect in line in the loop. They are often located near the water heater, however, they can be anywhere in the loop. The pumps circulate water at low pressure and low speeds. Once again, there is no need to have lots of water moving through the loop. It is just important that the water is hot near the fixtures.
If you install one of these pumps, remember that you need to install unions on either side of the pump. Unions are special fittings that allow you to break into the piping system and reconnect without soldering. Water meters are always installed using unions. Look at yours and you will see what I mean.
Toronto Hot Water Recirculation Toronto Hot Water Tips:
Insulation
Once you decide to install a recirculation loop, you need to be concerned with energy loss. The loop will work fantastically without insulation. In fact, it works best without it! But, this can also cause your water heater to cycle on and off more often. Remember, you are bleeding heat from the heater when the loop contains hot water.
There are numerous ways to insulate the pipe. Many insulating materials are made exclusively for water piping. They fit snugly over different sizes of pipe. Some insulation, like the foam types, must be installed as you install the pipe, not after the loop is constructed. When you select your insulation material, ask how and when it should be installed.
Piping installation methods must also be altered. Some people attach water piping to the sides of floor joists. You can't do this with an insulated loop system. The pipe must stand away from floor joists so that the insulation is not crushed. Special inexpensive pipe hangers allow you to do this easily.
All of the hot water lines that lead from the heater must be insulated. They need to be insulated up to where the return loop lines connect and slightly beyond. The return loop also needs to be partially insulated. If you insulate the entire system too well, it may not work! Remember, the water has to cool at some point for the loop to start its gentle movement. I suggest that you leave the final 15 feet of return loop un-insulated.
Toronto Hot Water Recirculation Toronto Hot Water Tips:
Beginning the Loop
Houses that do not have a recirculation loop system have hot water pipes that branch off a main line and stretch to each fixture. The ideal loop system would have you start the return loop as close as possible (within 2 feet) to each fixture. The closer the return loop starting point the closer hot water will be to the fixture.
Your existing home can benefit without getting this close to a fixture. As long as you can cut the distance in half or more, you will see a much more rapid hot water access time.
The return loop begins with a simple tee fitting as close to a fixture as you can get. The tee simply creates a right or left turn leading the way back to the water heater.
On your way back to the water heater you simply create other connections as other return loops join the pipe on the way back to the water heater.
Toronto Hot Water Recirculation Toronto Hot Water Tips:
Air Locks - BIG PROBLEMS!!
As you construct your loop system, you must be concerned with air traps. What are these? Well, you know the drain traps under your sinks? Imagine if you did this upside down with a water line in a loop system? You would capture air in this trap since air is lighter than water.
Air can get into a plumbing system in any number of ways: a water main break, a repair process in your own home, dissolved air within water, etc. If you create a trap, the air will collect in the trap and BLOCK movement of water within the return loop. Air is not a problem in the regular water piping system. The rapid movement of water through the pipes when you turn a faucet on pushes the air out of the way. Remember, water moves sloooowly through a gravity loop.
Toronto Hot Water Recirculation Toronto Hot Water Tips:
Check Valve
Just before the loop enters the bottom of the hot water heater you might need to install a simple check valve. These are one way valves. This valve will prohibit in-rushing cold water from the bottom of the hot water heater from flowing backwards through the loop when you open a hot water faucet somewhere within the system.
Check valves are not always necessary. Some systems need them because of friction loss and other obstructions that make it easier for the hot water to flow backwards through the loop rather than the correct direction - from the top of the heater!
These valves can be installed after the loop is completed. Install it in the vertical loop pipe just before it enters the hot water heater. You might want to try installing the loop first without one and see what happens. If you begin to get cold water at a faucet when you should get hot, you know you need a check valve.
Toronto Hot Water Recirculation Toronto Hot Water Tips:
Final Connection
As the loop returns to the water heater it connects at the low point of the heater. This is always the location of the heater drain valve. This valve is simply screwed into the heater. Attach a wrench to the valve and turn counterclockwise. It will come out.
Install an insulated nipple in place of the valve. This will minimize corrosion possibilities. Then as soon as possible install a tee fitting with female threads at the tee. If you use the right one, the drain valve will screw right back into the tee. The other end of the fitting allows you to connect the loop to the heater.
Toronto Hot Water Recirculation Toronto Hot Water Tips:
Shut Off Valves
While on the subject of valves, let's talk about the shut off valves on top of hot water heaters. I have seen some aggressive homeowners install a shut off valve on both the hot and cold water line. They thought this would help in the event they need to switch out the heater. Well it does help. It also creates a potential BOMB.
If some idiot turns off both valves (happens everyday somewhere), and the pressure relief valve malfunctions or was never installed, and the heater thermostat malfunctions, the heater will explode. It has happened more than once.
Only install a valve on the COLD water line, never on the hot line.