Precision Efficiency for Hydronic Heating: Grundfos UPSe 15-58F ECM Circulator Pump

The Grundfos UPSe 15-58F (92603106) is a high-efficiency circulator pump built around an electronically commutated motor (ECM), designed to move water through closed-loop hydronic heating systems like radiant floor heating, baseboards, and fan coils. It carries a Hydraulic Institute Energy Rating of 193, among the best available for a pump of this size, and draws as little as 3 watts thanks to the ECM technology adjusting output to match real-time demand. Three control modes, constant pressure, proportional pressure, and constant curve, each with three settings, let installers dial in performance for almost any hydronic application. Built-in dry-run protection, self-venting, and anti-block features mean fewer callbacks and a longer service life for this pump.

Key Features

Best-in-Class ECM Efficiency

With a Hydraulic Institute Energy Rating of 193, the UPSe 15-58F sits at the top of the market for energy efficiency in its class. The ECM motor continuously adjusts power draw between 3 and 38 watts based on system demand, cutting electricity use well below older fixed-speed circulators.

Three Control Modes for Any Hydronic System

Constant pressure, proportional pressure, and constant curve modes, each with three settings, give installers real flexibility to match the pump's output to a specific system instead of forcing a one-size-fits-all setting. That range makes it a strong fit for radiant floor loops, baseboard zones, and fan coil systems alike.

Built to Reduce Callbacks

Dry-run protection automatically stops the pump if it detects no water in the system, and self-venting works in any mounting orientation to prevent noise and lost performance from trapped air. If a blockage does occur, the pump shifts between torque levels on its own to try to shake it loose before a service call is ever needed.

Fast, Straightforward Installation

A toolless, removable power connector and compact conduit box speed up wiring, especially in tight mechanical spaces. The pump uses the standard GF15/26 flange connection, compatible with 3/4", 1", 1-1/4", and 1-1/2" pipe, and comes with a built-in check valve to prevent gravity flow when the system is off.

Product Details

• 1/20 HP electronically commutated motor (ECM)
• 13.6 GPM maximum flow rate
• 19 ft maximum head
• Hydraulic Institute Energy Rating of 193
• Three control modes: constant pressure, proportional pressure, constant curve
• Nine total speed and control settings
• Built-in dry-run protection
• Self-venting in any mounting position
• Anti-block torque-shifting protection
• Toolless power connector for faster wiring
• Built-in check valve
• Meets DOE circulator pump efficiency standards taking effect May 2028

As a global leader in pump technology since 1945, Grundfos is known for reliable, energy-efficient solutions for residential, commercial, and industrial applications.

Additional Information

• Brand: Grundfos
• MPN: 92603106
• Series: UPSe
• Product Type: ECM wet-rotor circulator pump for closed-loop hydronic systems
• Horsepower: 1/20 HP
• Voltage: 115V, 60Hz, single phase
• Amp Draw: 0.71A max
• Wattage: 3W to 38W (variable)
• Connection: 2-bolt GF15/26 flange, fits 3/4" to 1-1/2" pipe (flanges sold separately)
• Body Material: Cast iron
• Max Fluid Temperature: 230°F
• Max Operating Pressure: 175 PSI

Grundfos UPSe 15-58F FAQ

Can the UPSe 15-58F be used for domestic hot water recirculation?

No. This pump has a cast iron body, which is built for closed-loop hydronic heating systems like radiant floors, baseboards, and boiler loops where the same water circulates continuously and isn't exposed to fresh oxygenated water. Domestic hot water recirculation is an open-loop application that requires a bronze or stainless steel, lead-free rated pump instead, since cast iron will corrode over time when used with potable water.

What pipe sizes does this pump fit?

The UPSe 15-58F uses a standard GF15/26 two-bolt flange connection compatible with 3/4", 1", 1-1/4", and 1-1/2" pipe. Flanges themselves are sold separately, so make sure to order the correct size for your existing piping if you're replacing an older pump.

If you have questions or need assistance sizing your pump, then the Plumbing Deals team can help! Use the live chat feature, email at contact@plumbingdeals.com, or give us a call at 888-682-5956!

Which control mode should I use for my system?

Constant pressure mode works well for systems with variable flow needs across multiple zones, proportional pressure suits systems where head requirements change with flow, and constant curve mode mimics a traditional fixed-speed pump for simpler single-zone setups. Most installers start with proportional pressure for radiant or baseboard zoning, since it tends to balance efficiency and performance well without extensive tuning.

Does the UPSe 15-58F include a check valve?

Yes, it comes with a built-in check valve to prevent gravity flow through the system when the pump isn't running, which is especially useful in systems with multiple zones or a boiler positioned above the heating loop.

Can the UPSe 15-58F replace my old 3-speed Grundfos or TACO circulator?

In most cases, yes. The UPSe 15-58F uses the same standard GF15/26 flange as most 15-series circulators on the market, including older Grundfos UPS models and comparable Taco pumps, so the physical swap is usually straightforward as long as your existing flanges match.

The main difference is control: a fixed 3-speed pump just has high, medium, and low settings, while the UPSe's ECM motor and three control modes let it automatically adjust output to match the system instead of running at one flat speed the whole time, which is where most of the energy savings come from.

Weight	6.4 lb
Height	3.50 in.
Length	3.70 in.
Material	Cast Iron
Room	Utility
Width	6.50 in.
Inventory Number	GRU92603106
MPN	92603106

• Spec Sheet
• User Manual
• Installation Guide
• Safety Manual