Wilo Yonos PICO 25/1-8 180 High-Efficiency Glandless Heating Circulator Pump
The Wilo Yonos PICO 25/1-8 180 is the highest-head version of the Yonos PICO range (article number 4215517) — a high-efficiency glandless circulator delivering up to 8 m head and 4.4 m³/h flow for larger sealed heating systems, multi-zone underfloor manifolds and properties with long pipe runs. The ECM synchronous motor draws from 4 W to a maximum of 75 W, with EEI ≤ 0.20.
Built on the same cast-iron pump body and intuitive green-button interface as the rest of the range, the 25/1-8 specifies a 180 mm port-to-port length for installations originally designed around the longer commercial-style footprint. Control modes cover Δp-c, Δp-v and three fixed-speed curves; the LED display shows live setpoint, watts, m³/h flow and fault codes. Ports are 1½" BSP, the body is rated to 10 bar at 110 °C.
8 m maximum head and 4.4 m³/h flow handle higher-resistance circuits — long pipe runs, multi-zone UFH manifolds, plate-heat-exchanger secondaries — without forcing constant-speed operation at the top of the curve.
The 180 mm port-to-port length matches legacy commercial-style and certain larger-domestic circulators — ideal where the original pipework was set out for a 180 mm body.
Δp-c for UFH manifolds, 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 on a larger system.
A blocking-current-proof motor with automatic deblocking restart minimises the risk of seasonal seize-up on systems left dormant over the warmer months.
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 25/1-8 180 |
| Article number (MPN) | 4215517 |
| Pump type | Glandless wet-rotor circulator with ECM motor |
| Max. delivery head | 8 m |
| Max. flow rate (Q max.) | 4.4 m³/h |
| Energy Efficiency Index (EEI) | ≤ 0.20 |
| Power consumption P1 | 4 – 75 W |
| Mains connection | 1~230 V AC, 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 | 180 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. 2.3 kg |
| Conformity | ErP 2015 / EU 641/2009; EN 61800-3 EMC |
When should I choose the 25/1-8 over the 25/1-6?
Pick the 25/1-8 when the system has high circuit resistance — long pipe runs, multiple UFH manifolds with long flow loops, plate-heat-exchanger secondaries, or larger properties on more than one floor. If a heat-loss / pipework calculation puts the duty point beyond about 5 m head at design flow, step up to the 8-metre version.
Is it a drop-in replacement for a 180 mm Wilo Star-RS 25/8 or Grundfos UPS 25/80?
Yes — the 180 mm port-to-port length and 1½" BSP unions match the legacy commercial-style 180 mm footprint. Existing union nuts usually transfer over; only the electrical connection needs re-making.
Δp-c or Δp-v — which mode should I use?
Δp-v (variable) for radiator circuits with TRVs; Δp-c (constant) for UFH manifolds with thermal actuators. The three fixed-speed curves are available if the system designer or boiler manufacturer specifies a fixed-speed setting.
Will it work with antifreeze and inhibitors?
Yes — approved for water and water-glycol mixtures up to 1:1. Above 20% glycol the duty point should be re-checked against the published curves to allow for higher viscosity. Use a sealed-system inhibitor compatible with grey cast iron, PP-GF impeller and stainless-steel shaft.
Original: $226.74
-65%$226.74
$79.36Wilo Yonos PICO 25/1-8 180 High-Efficiency Glandless Heating Circulator Pump
The Wilo Yonos PICO 25/1-8 180 is the highest-head version of the Yonos PICO range (article number 4215517) — a high-efficiency glandless circulator delivering up to 8 m head and 4.4 m³/h flow for larger sealed heating systems, multi-zone underfloor manifolds and properties with long pipe runs. The ECM synchronous motor draws from 4 W to a maximum of 75 W, with EEI ≤ 0.20.
Built on the same cast-iron pump body and intuitive green-button interface as the rest of the range, the 25/1-8 specifies a 180 mm port-to-port length for installations originally designed around the longer commercial-style footprint. Control modes cover Δp-c, Δp-v and three fixed-speed curves; the LED display shows live setpoint, watts, m³/h flow and fault codes. Ports are 1½" BSP, the body is rated to 10 bar at 110 °C.
8 m maximum head and 4.4 m³/h flow handle higher-resistance circuits — long pipe runs, multi-zone UFH manifolds, plate-heat-exchanger secondaries — without forcing constant-speed operation at the top of the curve.
The 180 mm port-to-port length matches legacy commercial-style and certain larger-domestic circulators — ideal where the original pipework was set out for a 180 mm body.
Δp-c for UFH manifolds, 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 on a larger system.
A blocking-current-proof motor with automatic deblocking restart minimises the risk of seasonal seize-up on systems left dormant over the warmer months.
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 25/1-8 180 |
| Article number (MPN) | 4215517 |
| Pump type | Glandless wet-rotor circulator with ECM motor |
| Max. delivery head | 8 m |
| Max. flow rate (Q max.) | 4.4 m³/h |
| Energy Efficiency Index (EEI) | ≤ 0.20 |
| Power consumption P1 | 4 – 75 W |
| Mains connection | 1~230 V AC, 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 | 180 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. 2.3 kg |
| Conformity | ErP 2015 / EU 641/2009; EN 61800-3 EMC |
When should I choose the 25/1-8 over the 25/1-6?
Pick the 25/1-8 when the system has high circuit resistance — long pipe runs, multiple UFH manifolds with long flow loops, plate-heat-exchanger secondaries, or larger properties on more than one floor. If a heat-loss / pipework calculation puts the duty point beyond about 5 m head at design flow, step up to the 8-metre version.
Is it a drop-in replacement for a 180 mm Wilo Star-RS 25/8 or Grundfos UPS 25/80?
Yes — the 180 mm port-to-port length and 1½" BSP unions match the legacy commercial-style 180 mm footprint. Existing union nuts usually transfer over; only the electrical connection needs re-making.
Δp-c or Δp-v — which mode should I use?
Δp-v (variable) for radiator circuits with TRVs; Δp-c (constant) for UFH manifolds with thermal actuators. The three fixed-speed curves are available if the system designer or boiler manufacturer specifies a fixed-speed setting.
Will it work with antifreeze and inhibitors?
Yes — approved for water and water-glycol mixtures up to 1:1. Above 20% glycol the duty point should be re-checked against the published curves to allow for higher viscosity. Use a sealed-system inhibitor compatible with grey cast iron, PP-GF impeller and stainless-steel shaft.
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Product Information
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Description
The Wilo Yonos PICO 25/1-8 180 is the highest-head version of the Yonos PICO range (article number 4215517) — a high-efficiency glandless circulator delivering up to 8 m head and 4.4 m³/h flow for larger sealed heating systems, multi-zone underfloor manifolds and properties with long pipe runs. The ECM synchronous motor draws from 4 W to a maximum of 75 W, with EEI ≤ 0.20.
Built on the same cast-iron pump body and intuitive green-button interface as the rest of the range, the 25/1-8 specifies a 180 mm port-to-port length for installations originally designed around the longer commercial-style footprint. Control modes cover Δp-c, Δp-v and three fixed-speed curves; the LED display shows live setpoint, watts, m³/h flow and fault codes. Ports are 1½" BSP, the body is rated to 10 bar at 110 °C.
8 m maximum head and 4.4 m³/h flow handle higher-resistance circuits — long pipe runs, multi-zone UFH manifolds, plate-heat-exchanger secondaries — without forcing constant-speed operation at the top of the curve.
The 180 mm port-to-port length matches legacy commercial-style and certain larger-domestic circulators — ideal where the original pipework was set out for a 180 mm body.
Δp-c for UFH manifolds, 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 on a larger system.
A blocking-current-proof motor with automatic deblocking restart minimises the risk of seasonal seize-up on systems left dormant over the warmer months.
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 25/1-8 180 |
| Article number (MPN) | 4215517 |
| Pump type | Glandless wet-rotor circulator with ECM motor |
| Max. delivery head | 8 m |
| Max. flow rate (Q max.) | 4.4 m³/h |
| Energy Efficiency Index (EEI) | ≤ 0.20 |
| Power consumption P1 | 4 – 75 W |
| Mains connection | 1~230 V AC, 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 | 180 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. 2.3 kg |
| Conformity | ErP 2015 / EU 641/2009; EN 61800-3 EMC |
When should I choose the 25/1-8 over the 25/1-6?
Pick the 25/1-8 when the system has high circuit resistance — long pipe runs, multiple UFH manifolds with long flow loops, plate-heat-exchanger secondaries, or larger properties on more than one floor. If a heat-loss / pipework calculation puts the duty point beyond about 5 m head at design flow, step up to the 8-metre version.
Is it a drop-in replacement for a 180 mm Wilo Star-RS 25/8 or Grundfos UPS 25/80?
Yes — the 180 mm port-to-port length and 1½" BSP unions match the legacy commercial-style 180 mm footprint. Existing union nuts usually transfer over; only the electrical connection needs re-making.
Δp-c or Δp-v — which mode should I use?
Δp-v (variable) for radiator circuits with TRVs; Δp-c (constant) for UFH manifolds with thermal actuators. The three fixed-speed curves are available if the system designer or boiler manufacturer specifies a fixed-speed setting.
Will it work with antifreeze and inhibitors?
Yes — approved for water and water-glycol mixtures up to 1:1. Above 20% glycol the duty point should be re-checked against the published curves to allow for higher viscosity. Use a sealed-system inhibitor compatible with grey cast iron, PP-GF impeller and stainless-steel shaft.
