Comfort Series Hot Water Systems
by Grundfos

Tired of waiting for the water to heat up? The use of a circulating pump in an efficient recirculation system conserves water and energy, which will save you money. We offer innovative comfort systems especially designed for fixtures that do have a return line and that do NOT have a return line to the hot water source, so you can find the right system for your home - some with built-in timers or adaptive technology that learns your water consumption habits so you have hot water waiting for you.
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For additional information on the use of these systems, please view our guide to recirculating systems and refer to the FAQ's below.

Grundfos Comfort System Retrofit Instant Hot Water System

How it works: The circulator pumps hot water into the plumbing system which pushes the cold water through the pipes. This cold water then crosses over from the hot piping to the cold piping at the bypass valve. The cold water then runs back through the piping to the water heater to be reheated and recirculated. The valve starts closing at 93°F and is fully closed at 103°F. Hot water is then available at fixtures throughout your home. View complete technical specifications

Grundfos Comfort Series - UP15-10S
This recirculating system features:
  • Our most popular home recirculating pump!
  • No return line required - integrate it directly into your existing hot water system without re-plumbing your home (view installation diagram)
  • Have hot water almost instantly at any fixture in your home
  • No more water wasted down the drain while you're waiting for it to heat up
  • Analog timer & 10' power cord for super easy installation
  • Analog timer provides a choice of three control operations - continuous, 15 minute intervals, and off - so you can choose the best schedule for your family
  • Whisper quiet operation so you won't even notice it's there
  • Complete system includes:
Grundfos Comfort System UP15-10SU7P/TLC - with Analog Timer $489.29
Replacement Comfort Valve - 595926-1 $92.98
Braided Stainless Flex - 1/2" FIPS x 12" $5.92
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Grundfos Comfort PM Pumps with AUTOADAPT

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
This recirculating pump features:
  • 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 ultra quiet, permanent magnetic brushless motors which are more efficient than permanent split capacitor motors
  • 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)
  • Engineered for recirculating systems with a dedicated return line
  • External integrated sensor cable mounts simply and quickly to the hot water pipe
  • Union mounted pump includes built-in isolation valve and built-in check valve (check valve prevents water backflow to pump when isolation valve is closed). To totally isolate pump, purchase the bronze union isolation valve set
  • Corrosion resistant brass housing with 115V 6 ft. line cord
  • View Comfort PM pump curve chart
  • View pump mounting position information
  • Installation and operating instructions
Grundfos Comfort PM AUTOADAPT Pump UP10-16APM-B
Bronze Union Isolation Valve Set (2 each union isolation valves and gaskets)
Bronze Union Connection Set (2 each union connections and gaskets)
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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.

Disclaimer: All brands of instant hot water recirculation systems that do not require a hot water return line can be dangerous. They use a mechanical thermostat, which tells the system when to stop pumping the hot water into the cold water line. This thermostat can, and will, eventually fail - this failure may cause hot water to be pumped into the cold water line. This hot water can cause mild to severe burns, may damage toilets, and possibly other hazards.

If you plumb in a hot water circulation pump, we highly recommend that you choose a normal circulation system that utilizes a dedicated return line -this prevents the hot and cold water cross connection.

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. "I have multiple hot water branches. If I use the UP15-10S series, how will I get water to all branches?"
A. You can order additional comfort valves for each branch.

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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