Adjusting Flow To Hot And Cold Sources For Shower Metlund D’mand System Or the Chilipepper CP6000 – A Product Comparison

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Metlund D’mand System Or the Chilipepper CP6000 – A Product Comparison

Hot water demand systems are specialized circulation systems for use when there is no existing hot water return line. They are systems designed to quickly pump your hot water from your water heater to your fixtures without running it down the drain.

Your cold water line connects to the water heater inlet. Your hot water line connects to the water heater outlet. So if you connect a pump between your hot and cold water lines, you can pump water in a larger circle.

A hot water demand system pump connects the hot and cold water lines in the sink farthest from your water heater. When you want hot water, you press the button that starts the pump. The pump sends water to the pump through the hot water piping and the cooled hot water in the hot water piping is sent back to the inlet of the water heater through the cold water piping.

When the pump senses a temperature rise, it shuts off, preventing hot water from entering the cold water line. If the pump is strong enough, you can get your hot water faster than running the faucet.

Demand systems use very little electricity, typically running between $1.00 and $2.00.

Let’s compare two such systems, Metlund D’MAND System and Chilipepper CP6000.

Metlund D’Mand Systems

The Metlund D’MAND system has three different models with different horsepower ratings. The larger the horsepower rating, the faster the flow rate.

The first model in the S-50 size, the S-50T-PF-V-102 has the lowest power and lowest price around $339.50. According to the Metlund website, tankless water heaters are not recommended. The S-50 has 1/40 horsepower. The performance of the S-50 is listed as a flow rate of 8 gallons per minute with a maximum head pressure of 10 feet. 10 feet is about 4.3 psi.

However this is a bit misleading. The pump cannot have the back pressure to pump 8 gallons per minute, so the outlet cannot be connected to anything.

A pump with only 4 psi cannot pump much water through a straight piece of pipe. At only zero psi backpressure the pump can push out 8 gallons per minute. With the given information it is impossible to predict what the flow rate will be when installed in a plumbing system.

Metlund recommends using it for runs less than 50 feet and has a 3-year warranty. You will need to use full 1/2″ fittings to plumb the pump because the angle stop valve under the sink does not have enough pressure to pump more water through the small restriction.

Metlund Model S-70T

The next larger model is the S-70T. The website recommends running less than 60 feet for the S-70T pipe when using a tankless water heater and up to 100 feet with a standard water heater. The S-70T motor has 1/25 horsepower. Like other models this unit requires full 1/2″ piping connections and carries a 5 year warranty.

This pump is rated at 14 gallons per minute and 16 feet of head. 14 gallons per minute has to be done with 0 psi back pressure and at 16 ft head (7psi) the output flow drops to zero. Retail Price: About $441.50.

Metlund Model S-02

The largest model, the S-02, is 1/8 horsepower, again listed at 28 gallons per minute and 30 feet of head (13 psi). Like previous models it requires a full 1/2″ plumbing connection. This model weighs 16 lbs.

The S-02T-PF-V-102 has a list price of about $759.50 and a warranty of 5 years.

All three models list a 15-year lifespan and shut down when the pump detects a temperature rise of 3 to 4 degrees.

All three models are available on Metlund’s website.

Chilipepper CP6000

Chilipepper Sales manufactures only one model, the CP6000 with a powerful 1/3 horsepower motor. It produces a maximum pressure of about 60 psi (138 feet of head) and has a maximum flow of about 4 gallons per minute. (without back pressure)

Chilipepper was designed to connect plumbing with standard hoses used to connect faucets to shut-off valves. This way you don’t have to shut off the water in the house. All you have to do is close the shut-off valves under the sink and connect the hoses.

Horsepower is required to force water through the small (less than 1/4 inch diameter) opening in the hose connector. Since almost all of the pressure is used to reduce the pressure created by the small holes, the chili pepper almost always pumps. 2-3/4 to 3 gallons per minute regardless of piping conditions.

The CP6000 is 7-1/2″ long x 4-1/8″ wide x 3-1/2″ tall which is much smaller than the smallest Metland unit. It’s also light at about 4 pounds.

The CP6000 uses a brush type motor to achieve small size and large power. The brushes will wear out after about 500 hours of operation. If you use your pump 5 times a day 365 days a year and run it for 1 minute (100-150 feet) each time, you’ll accumulate about 30 hours a year. So you can expect your pump to last about 16 years. A new lip seal and a new set of brushes will get it back up and running again.

The CP6000 has a maximum run time of 3 minutes. If no temperature rise is detected within 3 minutes, it will turn off. This is because if the water heater breaks, the temperature will never rise enough to shut it off and it will run forever.

To determine the maximum distance from the water heater that can be handled by the chili pepper, we need to see how far the water will be pumped in 3 minutes. This will depend on your plumbing. Regardless of piping size, since the pump produces a flow of about 3 gallons per minute. The shorter the pipe, the faster the water flows.

For example, a 3/4 inch diameter L copper pipe at 3 gpm will have a water velocity of about 2 feet per second. Type L 1/2″ pipe would have a velocity of about 4 feet per second. So, assuming the worst case scenario, the house is plumbed entirely with 3/4″ pipe, your maximum distance from the water heater would be about 360 feet. If completely plumbed with 1/2″ dia. pipe, the distance would be 720 feet.

The CP6000 has an unconditional 30-day money back guarantee and can be returned for a full refund, no questions asked.

The CP6000 has an adjustable temperature sensor so you can set the unit to turn off when it senses a temperature of 3 to 12 degrees, allowing you to fine-tune the hot water arrival to your liking.

The CP6000 retails for $179.99 on the Chilipepper website.

Both Metlund and Chilipepper have code approvals.

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