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Comfort Series Circulation Pumps

by Grundfos

Tired of waiting for the water to heat up? These innovative comfort pumps are especially designed for those fixtures that are on a return line to the hot water source. The use of a circulating pump in an efficient recirculation system conserves water and energy, which will save you money. For additional information on the use of these great systems, please view our guide to recirculating systems and refer to the FAQ's below.

The Grundfos Comfort UP Series pump recirculates water in a continuous hot water pipe loop through the water heater so there will be no wait for the water to warm up (click here to view illustration).


These Comfort PM AUTO pumps use state of the art technology to provide you a pump that virtually learns your water heating habits, stores the information, and then adapts to operate according to your schedule. This incredible new AUTOADAPT technology helps ensure the pump only runs when required and can reduce your energy consumption by as much as 90% compared to traditional pumps that run continuously. You wait less time for hot water, reducing water and electrical waste. You can change the pump settings any time you wish by simply pushing the arrow button on the face of the pump with the tip of your finger. By operating the pump in temperature mode you will be able to automatically keep the temperature of your water at a pre-designated fixed temperature. If you decide you want the pump to run continuously you can put it into the 100% setting and it will run full speed for as long as you want it too and until you change the setting.

Grundfos Comfort PM pump with Auto Adapt
Comfort Pump PM with AUTOADAPT
  • Pump only runs when needed, lowering hot water wait times
  • Comfort PM Auto pumps can automatically learn, store and then adapt to your water consumption patterns
  • Designed to reduce energy consumption by using permanent magnetic brushless motors which are much more efficient than permanent split capacitor motors
  • ECM (electronically commutated motor) technology is used to control the speed of the motor with the use of a microprocessor to reverse the direction of the alternating electric current, as needed, directly effecting the motor rotation speed
  • Manually change the pump settings with the touch of your fingertip
  • 3 settings to choose from; AUTOADAPT mode, temperature mode, or 100% mode (constant full speed)
  • An external integrated sensor cable mounts simply and quickly to the hot water supply pipe
  • Corrosion resistant brass housing
  • 6 ft. line cord
  • View Comfort PM pump curve chart
  • View pump mounting position information

Grundfos Comfort PM AUTOADAPT - 115 volt pumps

Model Description Price & Quantity
UP10-16APM-B5/LC with 1/2" sweat connections $355.96
UP10-16APM-BN5/LC with 1/2" FNPT connections $357.91
UP10-16APM-BU/LC with internal check valve - Union Mount connections - Requires union adapters for new installations
- See Union Adapter Options

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COMFORT PM Pumps - Basic

The standard Comfort PM pumps run constantly at full speed. An excellent replacement pump for existing circulating systems when you want a dependable pump without all the bells and whistles.

Grundfos Comfort PM pump - basic
Comfort Pump PM Basic
  • Comfort PM pumps are compact enough to easily replace your existing circulation pumps plumbed with dedicated hot water return piping
  • Eliminates water waste - cooled water is recirculated back to water heater instead of running down your drain
  • Provides full speed constant operation
  • Energy efficient permanent magnetic brushless motor is much more efficient than permanent split capacitor motors
  • Super quiet operation
  • Corrosion resistant brass housing
  • Insulation shell easily installs after piping installation completed
  • 6 ft. line cord
  • View Comfort PM pump curve chart
  • View pump mounting position information

Grundfos Comfort PM - 115 volt - Basic Pumps

Model Description Price & Quantity
UP10-16PM-B5/LC - 1/2" sweat connections $241.18
UP10-16PM-BN5/LC - 1/2" FNPT connections $240.72

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Bronze Union Options
For union series pumps

Bronze Union Options (1 set required - sold in pairs)
Includes: 2 each - union connections, and gaskets
Part # Description Pump Connection Price & Quantity
529912 NPT Bronze Union set 3/4" GU 125 Union $39.48
529913 Solder Bronze Union set 1/2" GU 125 Union $33.74
529911 Solder Bronze Union set 3/4" GU 125 Union $32.79
519850 Bronze Isolation Union set 1/2" GU 125 Union $44.47
519852 Bronze Isolation Union set 3/4" GU 125 Union $44.29
519851 Compression Bronze Isolation set 3/4" GU 125 Union $44.48

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Comfort Series Instant Hot Water System #UP15-10S

The Grundfos Comfort Series instant hot water system eliminates cold water runoff at the faucet, using a bypass valve and pump with a timer to control water flow.

Grundfos Comfort Series - UP15-10S
  • No return line required
  • Unique wet rotor design
  • Conserves water and energy
  • Whisper quiet operation
  • Built-in timer & power cord
  • Maintenance free
  • Comes complete with pump and valve
  • 1/2" MPT inlets and outlets on comfort valve
  • View diagram
Model Description Price & Quantity
UP15-10SU7P/TLC 3/4" union x 3/4" NPT, 115v w/timer, line cord & 1 comfort valve $259.68
595926-1 Replacement or additional comfort valve - View dimensions $66.27

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Related Items & Information

Frequently Asked Questions

Q. "How does the Comfort UP hot water circulation pump work?"
A. Grundfos "Comfort" series hot water circulation pumps works in the following manner:

Grundfos UP comfort pumps

Please note: Unlike the diagram above, the Grundfos UP15-10S "Comfort" series hot water system works in the following manner: The comfort valve is installed under the faucet farthest from the water heater. The UP 15 series recirculation pump moves the hot water from the heater throughout the pipe back to the heater through the cold water line. As the water heats up at the comfort valve, it closes. When a faucet is turned on, warm water is instantly available for use with no waste.

Q. "I'd like to have hot water without much of a wait. How can I do this?"
A. The two easiest solutions are:
A) A tankless water heater at the source.
B) A hot-water recirculation system. This consists of a small pump and a return line from your farthest fixture. The pump mounts near the bottom of your water heater along with a swing check valve (see diagram found on our circulation pump page).

Q. "Does a hot water recirculating system use up a lot of energy?"
A. Both options use energy. But not as much as most people think. On the recirculating system we highly recommend insulating all of your hot water pipes. Also having a timer and/or a thermostat will use even less energy. An electric tankless water heater doesn't use any energy when you're not drawing hot water.

Q. "What is an aquastat?"
A. An aquastat is a thermostat control that turns the pump on or off based on temperature.

Q. "What is the benefit of installing an optional timer or thermostat?"
A. Either one will save energy (and money). The timer only allows the pump to turn on at certain times. So if you only need hot water in the morning, you could set the timer for 6am to 8am. Then the pump would only recirculate the hot water during that time. The thermostat turns off the pump when the water in the pipes reaches a certain temperature. So once the water in the pipe is hot, the pump turns off. When the timer and thermostatic controls are installed together, in series, the circulator operates ONLY at the preset clock times specified by the user AND ONLY when the temperature conditions of the thermostat are met. That is, if either the timer control or the thermostatic control switch is open (off), the circulator will not operate.

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