Wilo Yonos PICO 25/1-6 130 High-Efficiency Glandless Heating Circulator Pump
The Wilo Yonos PICO 25/1-6 130 is the most popular size in the Yonos PICO range (article number 4215516) — a high-efficiency glandless circulator delivering up to 6 m head and 3.6 m³/h flow for sealed heating, underfloor and air-conditioning circuits in single, two- and small multi-family homes. The ECM synchronous motor draws as little as 4 W, with EEI ≤ 0.20.
The green operating button selects Δp-c, Δp-v or three fixed-speed curves — covering everything from a TRV-rich radiator circuit to a multi-zone UFH manifold. The on-pump LED display shows setpoint, live watts and m³/h flow, plus fault codes. With 1½" BSP unions, 130 mm port-to-port and a cast-iron body rated to 10 bar / 110 °C, it is a direct swap for older Wilo Star-RS, Grundfos UPS or Alpha 2 circulators.
An electronically commutated synchronous motor with built-in frequency converter delivers EEI ≤ 0.20 — the benchmark for the most efficient circulators.
Δp-c for UFH, Δp-v for TRV radiator circuits, or one of three constant-speed curves if the boiler manufacturer specifies a fixed setting.
The on-pump LED window shows live flow in m³/h as well as power in watts — invaluable for verifying balancing and confirming the duty point during commissioning.
The motor is blocking-current proof, so no external motor protection is required — the controller attempts an automatic deblocking restart if the rotor jams.
A manual venting routine clears trapped air from the rotor chamber on commissioning, and the manual restart button overrides a fault state once the underlying cause is resolved.
Grey cast-iron body rated to 10 bar with a PP-GF40 impeller, stainless-steel shaft and metal-impregnated carbon bearings — built for long sealed-system service life.
| Manufacturer / brand | Wilo |
| Model | Yonos PICO 25/1-6 130 |
| Article number (MPN) | 4215516 |
| EAN | 4048482758480 |
| Pump type | Glandless wet-rotor circulator with ECM motor |
| Max. delivery head | 6 m |
| Max. flow rate (Q max.) | 3.6 m³/h |
| Energy Efficiency Index (EEI) | ≤ 0.20 |
| Power consumption P1 | 4.0 – 40.0 W |
| Mains connection | 1~230 V AC ±10%, 50/60 Hz |
| Speed range | 800 – 4,200 rpm |
| Control modes | Δp-c, Δp-v, 3 fixed-speed curves |
| Threaded pipe union | Rp 1" (G 1½ thread) |
| Port-to-port length | 130 mm |
| Max. operating pressure | 10 bar (PN10) |
| Fluid temperature range | −10 °C to +110 °C (95 °C at 40 °C ambient) |
| Min. inlet head at 50 / 95 / 110 °C | 0.5 / 3 / 10 m |
| Pump housing | Grey cast iron |
| Impeller / shaft / bearings | PP-GF40 / stainless steel / carbon |
| Protection class | IPX2D |
| Weight (net) | Approx. 2.0 kg |
| Conformity | ErP 2015 / EU 641/2009; EN 61800-3 EMC |
Will the 25/1-6 replace my existing pump?
Almost certainly. The 130 mm port-to-port length and 1½" BSP unions are the industry-standard footprint shared by the Wilo Star-RS, Grundfos UPS, UPS2 and Alpha 2 ranges. Existing union nuts usually transfer over without pipework changes.
Δp-c or Δp-v — which mode should I use?
Use Δp-v (variable) for radiator systems with TRVs: the pump reduces head as TRVs close, saving energy and reducing flow noise. Use Δp-c (constant) for UFH manifolds with thermal actuators that switch zones fully on or off — this maintains a steady head across the valves regardless of how many zones are calling.
Is it compatible with heat pumps?
Yes, on the secondary side. Many heat-pump installations use a low-loss header or buffer tank, with the Yonos PICO as the secondary circulator feeding the emitter circuit. Confirm with the heat-pump manufacturer that a wet-rotor ECM circulator on the secondary side is acceptable, and check duty against the published curves.
How much energy will it save?
Compared with a typical older 3-speed pump averaging 60–90 W, the 25/1-6 typically runs at 5–25 W in normal heating operation — in the order of £40–£80 in electricity savings per UK heating season.
Original: $180.86
-65%$180.86
$63.30Wilo Yonos PICO 25/1-6 130 High-Efficiency Glandless Heating Circulator Pump
The Wilo Yonos PICO 25/1-6 130 is the most popular size in the Yonos PICO range (article number 4215516) — a high-efficiency glandless circulator delivering up to 6 m head and 3.6 m³/h flow for sealed heating, underfloor and air-conditioning circuits in single, two- and small multi-family homes. The ECM synchronous motor draws as little as 4 W, with EEI ≤ 0.20.
The green operating button selects Δp-c, Δp-v or three fixed-speed curves — covering everything from a TRV-rich radiator circuit to a multi-zone UFH manifold. The on-pump LED display shows setpoint, live watts and m³/h flow, plus fault codes. With 1½" BSP unions, 130 mm port-to-port and a cast-iron body rated to 10 bar / 110 °C, it is a direct swap for older Wilo Star-RS, Grundfos UPS or Alpha 2 circulators.
An electronically commutated synchronous motor with built-in frequency converter delivers EEI ≤ 0.20 — the benchmark for the most efficient circulators.
Δp-c for UFH, Δp-v for TRV radiator circuits, or one of three constant-speed curves if the boiler manufacturer specifies a fixed setting.
The on-pump LED window shows live flow in m³/h as well as power in watts — invaluable for verifying balancing and confirming the duty point during commissioning.
The motor is blocking-current proof, so no external motor protection is required — the controller attempts an automatic deblocking restart if the rotor jams.
A manual venting routine clears trapped air from the rotor chamber on commissioning, and the manual restart button overrides a fault state once the underlying cause is resolved.
Grey cast-iron body rated to 10 bar with a PP-GF40 impeller, stainless-steel shaft and metal-impregnated carbon bearings — built for long sealed-system service life.
| Manufacturer / brand | Wilo |
| Model | Yonos PICO 25/1-6 130 |
| Article number (MPN) | 4215516 |
| EAN | 4048482758480 |
| Pump type | Glandless wet-rotor circulator with ECM motor |
| Max. delivery head | 6 m |
| Max. flow rate (Q max.) | 3.6 m³/h |
| Energy Efficiency Index (EEI) | ≤ 0.20 |
| Power consumption P1 | 4.0 – 40.0 W |
| Mains connection | 1~230 V AC ±10%, 50/60 Hz |
| Speed range | 800 – 4,200 rpm |
| Control modes | Δp-c, Δp-v, 3 fixed-speed curves |
| Threaded pipe union | Rp 1" (G 1½ thread) |
| Port-to-port length | 130 mm |
| Max. operating pressure | 10 bar (PN10) |
| Fluid temperature range | −10 °C to +110 °C (95 °C at 40 °C ambient) |
| Min. inlet head at 50 / 95 / 110 °C | 0.5 / 3 / 10 m |
| Pump housing | Grey cast iron |
| Impeller / shaft / bearings | PP-GF40 / stainless steel / carbon |
| Protection class | IPX2D |
| Weight (net) | Approx. 2.0 kg |
| Conformity | ErP 2015 / EU 641/2009; EN 61800-3 EMC |
Will the 25/1-6 replace my existing pump?
Almost certainly. The 130 mm port-to-port length and 1½" BSP unions are the industry-standard footprint shared by the Wilo Star-RS, Grundfos UPS, UPS2 and Alpha 2 ranges. Existing union nuts usually transfer over without pipework changes.
Δp-c or Δp-v — which mode should I use?
Use Δp-v (variable) for radiator systems with TRVs: the pump reduces head as TRVs close, saving energy and reducing flow noise. Use Δp-c (constant) for UFH manifolds with thermal actuators that switch zones fully on or off — this maintains a steady head across the valves regardless of how many zones are calling.
Is it compatible with heat pumps?
Yes, on the secondary side. Many heat-pump installations use a low-loss header or buffer tank, with the Yonos PICO as the secondary circulator feeding the emitter circuit. Confirm with the heat-pump manufacturer that a wet-rotor ECM circulator on the secondary side is acceptable, and check duty against the published curves.
How much energy will it save?
Compared with a typical older 3-speed pump averaging 60–90 W, the 25/1-6 typically runs at 5–25 W in normal heating operation — in the order of £40–£80 in electricity savings per UK heating season.
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Product Information
Shipping & Returns
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Description
The Wilo Yonos PICO 25/1-6 130 is the most popular size in the Yonos PICO range (article number 4215516) — a high-efficiency glandless circulator delivering up to 6 m head and 3.6 m³/h flow for sealed heating, underfloor and air-conditioning circuits in single, two- and small multi-family homes. The ECM synchronous motor draws as little as 4 W, with EEI ≤ 0.20.
The green operating button selects Δp-c, Δp-v or three fixed-speed curves — covering everything from a TRV-rich radiator circuit to a multi-zone UFH manifold. The on-pump LED display shows setpoint, live watts and m³/h flow, plus fault codes. With 1½" BSP unions, 130 mm port-to-port and a cast-iron body rated to 10 bar / 110 °C, it is a direct swap for older Wilo Star-RS, Grundfos UPS or Alpha 2 circulators.
An electronically commutated synchronous motor with built-in frequency converter delivers EEI ≤ 0.20 — the benchmark for the most efficient circulators.
Δp-c for UFH, Δp-v for TRV radiator circuits, or one of three constant-speed curves if the boiler manufacturer specifies a fixed setting.
The on-pump LED window shows live flow in m³/h as well as power in watts — invaluable for verifying balancing and confirming the duty point during commissioning.
The motor is blocking-current proof, so no external motor protection is required — the controller attempts an automatic deblocking restart if the rotor jams.
A manual venting routine clears trapped air from the rotor chamber on commissioning, and the manual restart button overrides a fault state once the underlying cause is resolved.
Grey cast-iron body rated to 10 bar with a PP-GF40 impeller, stainless-steel shaft and metal-impregnated carbon bearings — built for long sealed-system service life.
| Manufacturer / brand | Wilo |
| Model | Yonos PICO 25/1-6 130 |
| Article number (MPN) | 4215516 |
| EAN | 4048482758480 |
| Pump type | Glandless wet-rotor circulator with ECM motor |
| Max. delivery head | 6 m |
| Max. flow rate (Q max.) | 3.6 m³/h |
| Energy Efficiency Index (EEI) | ≤ 0.20 |
| Power consumption P1 | 4.0 – 40.0 W |
| Mains connection | 1~230 V AC ±10%, 50/60 Hz |
| Speed range | 800 – 4,200 rpm |
| Control modes | Δp-c, Δp-v, 3 fixed-speed curves |
| Threaded pipe union | Rp 1" (G 1½ thread) |
| Port-to-port length | 130 mm |
| Max. operating pressure | 10 bar (PN10) |
| Fluid temperature range | −10 °C to +110 °C (95 °C at 40 °C ambient) |
| Min. inlet head at 50 / 95 / 110 °C | 0.5 / 3 / 10 m |
| Pump housing | Grey cast iron |
| Impeller / shaft / bearings | PP-GF40 / stainless steel / carbon |
| Protection class | IPX2D |
| Weight (net) | Approx. 2.0 kg |
| Conformity | ErP 2015 / EU 641/2009; EN 61800-3 EMC |
Will the 25/1-6 replace my existing pump?
Almost certainly. The 130 mm port-to-port length and 1½" BSP unions are the industry-standard footprint shared by the Wilo Star-RS, Grundfos UPS, UPS2 and Alpha 2 ranges. Existing union nuts usually transfer over without pipework changes.
Δp-c or Δp-v — which mode should I use?
Use Δp-v (variable) for radiator systems with TRVs: the pump reduces head as TRVs close, saving energy and reducing flow noise. Use Δp-c (constant) for UFH manifolds with thermal actuators that switch zones fully on or off — this maintains a steady head across the valves regardless of how many zones are calling.
Is it compatible with heat pumps?
Yes, on the secondary side. Many heat-pump installations use a low-loss header or buffer tank, with the Yonos PICO as the secondary circulator feeding the emitter circuit. Confirm with the heat-pump manufacturer that a wet-rotor ECM circulator on the secondary side is acceptable, and check duty against the published curves.
How much energy will it save?
Compared with a typical older 3-speed pump averaging 60–90 W, the 25/1-6 typically runs at 5–25 W in normal heating operation — in the order of £40–£80 in electricity savings per UK heating season.
