The Grundfos UPM3 AUTO 25-70 130 (part no. 59C93602) is a self-regulating, internally controlled circulator pump built for domestic heating and underfloor heating systems that need reliable performance without an external speed-control signal. Powered by a permanent-magnet ECM motor with an onboard frequency converter, it uses AUTOADAPT technology to continuously read the system and settle on the most efficient proportional or constant pressure curve automatically — no commissioning adjustment required.
Please Note
This is an internally (self) controlled pump — it does not accept an external PWM signal from a manifold controller or wiring centre. If your system already has a PWM-based zone controller, the UPM3 FLEX AS 25-70 130 AZA (part no. 93008970) is the correct externally controlled alternative. See the comparison in the FAQs below before ordering.
Why Choose the UPM3 AUTO
AUTOADAPT Self-Regulation
The pump continuously analyses system behaviour over a three-step adaptive process and settles on the optimum proportional or constant pressure curve, removing the need for manual curve selection during commissioning.
Five Control Modes, 18 Curves
Beyond AUTOADAPT, the pump offers five selectable control modes across 18 performance curves (proportional pressure, constant pressure, and constant speed), giving installers a manual fallback if adaptive control isn't wanted.
Ceramic Bearing Shaft
A ceramic bearing shaft resists limescale build-up far better than steel equivalents, protecting long-term reliability in hard-water areas without added maintenance.
Double De-Blocking System
Combines electronic de-blocking (up to 25 Ncm starting torque) with a manual front-accessible de-blocking screw, so a seized rotor after seasonal shutdown can be freed without removing the pump head.
High Ambient Temperature Tolerance
Rated for ambient temperatures up to 70 °C, making it suitable for installation inside enclosed boiler casings and heating appliance cabinets where space and airflow are limited.
Compact Footprint
One of the smallest circulator footprints available for an appliance-integrated pump, easing retrofit into tight boiler compartments without redesigning the casing.
Technical Specification
| Electrical Data |
| Rated voltage |
1 × 230 V, 50 Hz |
| Power input (P1) |
5 – 52 W |
| Maximum current consumption |
0.07 – 0.52 A |
| Enclosure class |
IP44 |
| Motor protection |
Not required (self-protecting) |
| Liquid Data |
| Pumped liquid |
Water, clean and thin, non-aggressive |
| Liquid temperature range |
2 – 110 °C |
| Water quality standard |
VDI 2035 compliant |
| Mechanical / Installation |
| Maximum head |
7 m |
| Port-to-port length |
130 mm |
| Connection thread |
1½" BSP (G 2") |
| Maximum ambient temperature |
70 °C |
| Maximum operating pressure |
10 bar |
| Approvals |
| Certifications |
CE, UKCA, VDE |
| Warranty |
2 year manufacturer warranty |
Frequently Asked Questions
What's the difference between the UPM3 AUTO and the UPM3 FLEX AS 25-70 130 AZA?
The AUTO (59C93602) is a self-regulating pump that runs entirely on its own internal AUTOADAPT logic with no external control input required. The FLEX AS (93008970) is designed for systems that already have — or may later add — a PWM signal from a manifold controller or wiring centre, letting an external controller vary pump speed by zone demand. If you have no PWM controller and want a set-and-forget pump, choose the AUTO. If your system includes zone-based PWM control, choose the FLEX AS.
Can this pump be controlled by an external wiring centre or manifold controller?
No. The UPM3 AUTO 25-70 130 is internally controlled only and has no PWM input for external speed control. It reads pressure conditions in the pipework itself via AUTOADAPT.
Is this a suitable replacement for an Alpha2L or older UPS-series pump?
Yes. The UPM3 AUTO is designed as a direct upgrade path for older uncontrolled or basic circulators such as the Alpha2L and legacy UPS 25-60 130 models, offering significantly improved energy efficiency (EEI ≤ 0.20) in the same 130 mm port-to-port footprint.
What connection size does this pump use?
The UPM3 AUTO 25-70 130 uses a 1½" BSP (G 2") threaded connection with a 130 mm port-to-port length, matching standard UK heating pump fittings.
Does it need external motor protection or overload wiring?
No. The permanent-magnet ECM motor is self-protecting and requires no external motor protection or overload relay — install per the standard 230 V single-phase supply requirements.
