{"product_id":"wilo-yonos-pico-25-1-8-180-high-efficiency-glandless-heating-circulator-pump","title":"Wilo Yonos PICO 25\/1-8 180 High-Efficiency Glandless Heating Circulator Pump","description":"\u003cdiv style=\"font-size: 16px; line-height: 1.6; color: #1a1a1a; max-width: 900px; margin: 0 auto; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\"\u003e\n\u003cp style=\"font-size: 17px; line-height: 1.65; margin: 0 0 18px 0;\"\u003eThe \u003cstrong\u003eWilo Yonos PICO 25\/1-8 180\u003c\/strong\u003e is the \u003cstrong\u003ehighest-head version\u003c\/strong\u003e of the Yonos PICO range (article number 4215517) — a high-efficiency glandless circulator delivering up to \u003cstrong\u003e8 m head\u003c\/strong\u003e and \u003cstrong\u003e4.4 m³\/h flow\u003c\/strong\u003e for larger sealed heating systems, multi-zone underfloor manifolds and properties with long pipe runs. The \u003cstrong\u003eECM synchronous motor\u003c\/strong\u003e draws from \u003cstrong\u003e4 W to a maximum of 75 W\u003c\/strong\u003e, with \u003cstrong\u003eEEI ≤ 0.20\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"font-size: 17px; line-height: 1.65; margin: 0 0 22px 0;\"\u003eBuilt on the same \u003cstrong\u003ecast-iron pump body\u003c\/strong\u003e and intuitive \u003cstrong\u003egreen-button interface\u003c\/strong\u003e as the rest of the range, the 25\/1-8 specifies a \u003cstrong\u003e180 mm port-to-port length\u003c\/strong\u003e for installations originally designed around the longer commercial-style footprint. Control modes cover \u003cstrong\u003eΔp-c, Δp-v\u003c\/strong\u003e and three fixed-speed curves; the \u003cstrong\u003eLED display\u003c\/strong\u003e shows live setpoint, watts, m³\/h flow and fault codes. Ports are \u003cstrong\u003e1½\" BSP\u003c\/strong\u003e, the body is rated to \u003cstrong\u003e10 bar at 110 °C\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv style=\"margin: 0 0 24px 0;\"\u003e\n\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eEEI ≤ 0.20\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003eECM Motor\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003e8 m Max Head\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003e4.4 m³\/h Flow\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003e180 mm Length\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003e1½\" BSP\u003c\/span\u003e\u003cspan style=\"display: inline-block; background: #008377CF; color: #fff; padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin: 0 6px 8px 0;\"\u003e230 V\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); gap: 12px; margin: 0 0 26px 0;\"\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e8 m\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eMAX DELIVERY HEAD\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e4.4\u003cspan style=\"font-size: 16px;\"\u003e m³\/h\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eMAX FLOW\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e4 – 75\u003cspan style=\"font-size: 16px;\"\u003e W\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003ePOWER RANGE\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e180 mm\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003ePORT-TO-PORT\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 16px 12px; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 26px; font-weight: bold; color: #005c54; line-height: 1;\"\u003e10 bar\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px; color: #4a5a5a; margin-top: 6px; font-weight: 600; letter-spacing: 0.3px;\"\u003eMAX OPERATING PR.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff5f5; border-left: 4px solid #d32f2f; padding: 12px 18px; margin: 0 0 14px 0; border-radius: 4px;\"\u003e\n\u003cstrong style=\"color: #b71c1c;\"\u003eProfessional installation required.\u003c\/strong\u003e \u003cspan style=\"color: #3a3a3a;\"\u003eA 230 V AC mains-powered device — must be installed by a qualified electrician. \u003cstrong\u003eNot ATEX-rated\u003c\/strong\u003e; do not install in explosive atmospheres or use to circulate flammable fluids.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff8e1; border-left: 4px solid #f57c00; padding: 12px 18px; margin: 0 0 14px 0; border-radius: 4px;\"\u003e\n\u003cstrong style=\"color: #e65100;\"\u003eHeating circuits only.\u003c\/strong\u003e \u003cspan style=\"color: #3a3a3a;\"\u003e\u003cstrong\u003eCast-iron-bodied heating circulator\u003c\/strong\u003e — \u003cstrong\u003enot\u003c\/strong\u003e approved for potable \/ domestic hot water secondary return loops. For DHW circulation use the stainless-steel-bodied \u003cstrong\u003eYonos PICO-Z\u003c\/strong\u003e instead.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #e6f4f3; border-left: 4px solid #008377; padding: 12px 18px; margin: 0 0 26px 0; border-radius: 4px;\"\u003e\n\u003cstrong style=\"color: #005c54;\"\u003eTypical application.\u003c\/strong\u003e \u003cspan style=\"color: #3a3a3a;\"\u003eLarger sealed heating systems with high circuit resistance — multi-zone UFH manifolds, three-storey properties, long pipe runs, and replacement of legacy 180 mm commercial-style circulators on light-commercial and large-domestic installs.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 12px 20px; margin: 28px 0 16px 0; border-radius: 6px; font-size: 18px; font-weight: bold; letter-spacing: 0.3px;\"\u003eKey Features\u003c\/div\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(260px,1fr)); gap: 14px; margin: 0 0 28px 0;\"\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003e8 m High-Head Performance\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003e\u003cstrong\u003e8 m maximum head\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003e180 mm Replacement Footprint\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eThe \u003cstrong\u003e180 mm port-to-port length\u003c\/strong\u003e matches legacy commercial-style and certain larger-domestic circulators — ideal where the original pipework was set out for a 180 mm body.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eThree Modes Plus 3 Fixed Speeds\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003e\u003cstrong\u003eΔp-c\u003c\/strong\u003e for UFH manifolds, \u003cstrong\u003eΔp-v\u003c\/strong\u003e for TRV radiator circuits, or one of three \u003cstrong\u003econstant-speed curves\u003c\/strong\u003e if the boiler manufacturer specifies a fixed setting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eLive Flow \u0026amp; Power Readout\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eThe on-pump \u003cstrong\u003eLED window\u003c\/strong\u003e shows live \u003cstrong\u003eflow in m³\/h\u003c\/strong\u003e as well as power in watts — invaluable for verifying balancing and confirming the duty point on a larger system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eAutomatic Deblocking\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003eA \u003cstrong\u003eblocking-current-proof motor\u003c\/strong\u003e with automatic deblocking restart minimises the risk of seasonal seize-up on systems left dormant over the warmer months.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; color: #005c54; padding-bottom: 6px; border-bottom: 2px solid #008377; display: inline-block; margin-bottom: 10px;\"\u003eRobust Materials\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 14.5px; line-height: 1.55; color: #2a2a2a;\"\u003e\u003cstrong\u003eGrey cast-iron body\u003c\/strong\u003e rated to 10 bar with a \u003cstrong\u003ePP-GF40 impeller\u003c\/strong\u003e, stainless-steel shaft and metal-impregnated carbon bearings — built for long sealed-system service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 12px 20px; margin: 28px 0 16px 0; border-radius: 6px; font-size: 18px; font-weight: bold; letter-spacing: 0.3px;\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 0 0 28px 0; font-size: 14.5px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eManufacturer \/ brand\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eWilo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eYonos PICO 25\/1-8 180\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eArticle number (MPN)\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e4215517\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003ePump type\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eGlandless wet-rotor circulator with ECM motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMax. delivery head\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e8 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMax. flow rate (Q max.)\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e4.4 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eEnergy Efficiency Index (EEI)\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e≤ 0.20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003ePower consumption P1\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e4 – 75 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMains connection\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e1~230 V AC, 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eSpeed range\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e800 – 4,200 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eControl modes\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eΔp-c, Δp-v, 3 fixed-speed curves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eThreaded pipe union\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eRp 1\" (G 1½ thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003ePort-to-port length\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e180 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMax. operating pressure\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e10 bar (PN10)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eFluid temperature range\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e−10 °C to +110 °C (95 °C at 40 °C ambient)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eMin. inlet head at 50 \/ 95 \/ 110 °C\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003e0.5 \/ 3 \/ 10 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003ePump housing\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eGrey cast iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eImpeller \/ shaft \/ bearings\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003ePP-GF40 \/ stainless steel \/ carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eProtection class\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eIPX2D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eWeight (net)\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eApprox. 2.3 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f0faf9;\"\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3; font-weight: 600; width: 45%;\"\u003eConformity\u003c\/td\u003e\n\u003ctd style=\"padding: 11px 14px; border: 1px solid #c8e6e3;\"\u003eErP 2015 \/ EU 641\/2009; EN 61800-3 EMC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 12px 20px; margin: 28px 0 16px 0; border-radius: 6px; font-size: 18px; font-weight: bold; letter-spacing: 0.3px;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 10px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eWhen should I choose the 25\/1-8 over the 25\/1-6?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003ePick the 25\/1-8 when the system has \u003cstrong\u003ehigh circuit resistance\u003c\/strong\u003e — 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 10px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eIs it a drop-in replacement for a 180 mm Wilo Star-RS 25\/8 or Grundfos UPS 25\/80?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003eYes — the \u003cstrong\u003e180 mm port-to-port length and 1½\" BSP unions\u003c\/strong\u003e match the legacy commercial-style 180 mm footprint. Existing union nuts usually transfer over; only the electrical connection needs re-making.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 10px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eΔp-c or Δp-v — which mode should I use?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003e\u003cstrong\u003eΔp-v (variable)\u003c\/strong\u003e for radiator circuits with TRVs; \u003cstrong\u003eΔp-c (constant)\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 6px; padding: 14px 18px; margin: 0 0 26px 0;\"\u003e\n\u003csummary style=\"font-weight: 600; color: #005c54; cursor: pointer; font-size: 15.5px;\"\u003eWill it work with antifreeze and inhibitors?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; font-size: 14.5px; line-height: 1.6;\"\u003eYes — approved for \u003cstrong\u003ewater and water-glycol mixtures up to 1:1\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 16px 22px; border-radius: 6px; margin: 30px 0 0 0; text-align: center;\"\u003e\n\u003cdiv style=\"font-size: 16px; font-weight: bold; margin-bottom: 6px;\"\u003ePair It With\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; opacity: 0.95;\"\u003eGenuine Wilo gate valves, isolation unions and an inline magnetic system filter — all available from Quality Heating to complete a clean, low-maintenance circulator install.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Wilo","offers":[{"title":"Default Title","offer_id":64534868230493,"sku":"4215517","price":147.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/WiloYonosPICO251-8180CirculatingPump4215517.webp?v=1777288510","url":"https:\/\/qualityheating.co.uk\/products\/wilo-yonos-pico-25-1-8-180-high-efficiency-glandless-heating-circulator-pump","provider":"AIZO Quality Heating","version":"1.0","type":"link"}