Wilo Wilo-TOP-SD
Wilo twin circulation pumps, glandless, with manually stepped speed control, for heating, air conditioning and closed cooling circuits.
Wilo-TOP-SD is a twin glandless circulation pump: two motor-pump units work in the same casing, in duty/standby mode or in parallel, and the double changeover flap is integrated in the pump casing. The speed is selected manually, in steps, and the casing has a cathodic electrocoating (KTL) that protects it from corrosion caused by condensate. The pump is used in hot water heating systems, industrial circulation circuits, air conditioning systems and closed cooling circuits.
The code has the form TOP-SD 40/7: 40 is the nominal diameter of the connection, and 7 is the nominal head, in metres, at zero flow. TOP-SD 30/5 has a threaded connection, the other sizes have a flange, from DN 32 to DN 80; the supply is 1~230 V or 3~400 V, depending on the type. For a quotation we need the code from the nameplate, the supply voltage and the operating pressure of the installation. When the item is available locally or at the supplier, delivery takes 24–72 h, and on order usually 1–4 weeks.
Models and codes
| Code | Note |
|---|---|
| TOP-SD 30/5 | G 2 threaded connection, PN 10, 1~230 V and 3~400 V variants. |
| TOP-SD 32/7 | DN 32 combined flange, PN 6/10, 1~230 V and 3~400 V variants. |
| TOP-SD 40/7 | DN 40 combined flange, PN 6/10, 1~230 V and 3~400 V variants. |
| TOP-SD 50/10 | DN 50 combined flange, PN 6/10; the 1~230 V variant has 2 speed steps, and a 3~400 V variant also exists. |
| TOP-SD 65/13 | DN 65 combined flange, PN 6/10, 3~400 V only. |
| TOP-SD 80/20 | DN 80 flange, PN 6 or PN 10, 3~400 V; liquid up to +110 °C. |
Key specifications
| Liquid temperature | -20…+130 °C, for short periods (2 h) up to +140 °C; TOP-SD 80/15 and 80/20: -20…+110 °C |
|---|---|
| Power supply | 1~230 V, 50 Hz (depending on type); 3~230 V, 50 Hz (with optional switching plug); 3~400 V, 50 Hz |
| Connections | threaded (TOP-SD 30/5) or DN 32–DN 80 flange |
| Flanges | standard version: DN 32–DN 65, combined PN 6/10 flange; DN 80, PN 6 flange, designed for PN 16 (EN 1092-2) |
| Maximum operating pressure | 6/10 bar or 6 bar in the standard version; 10 bar in the special version |
| Materials | grey cast iron casing, plastic impeller, stainless steel shaft, metal-impregnated carbon bearing |
| Protection class | IP X4D |
| Motor protection | internal winding protection at P2 ≤ 180 W; WSK thermal contact at P2 ≥ 180 W, with optional SK 602N/SK 622N trip unit |
Wilo lists the series with variants from TOP-SD 30/5 to TOP-SD 80/20, with no withdrawal announcement.
Frequently asked questions
Does Wilo-TOP-SD switch to the standby pump by itself?
No. The pump has two motor-pump units and the changeover flap in the casing, but automatic switching on failure and alternating operation at intervals require a separately mounted control panel in the installation.
What does 40/7 mean in the code TOP-SD 40/7?
40 is the nominal diameter of the connection, and 7 is the nominal head, in metres, at zero flow.
What data do you need for a quotation for a TOP-SD pump?
The code from the nameplate (for example TOP-SD 40/7), the supply voltage (1~230 V or 3~400 V) and the operating pressure of the installation. If you are replacing another twin pump, the flow, the head and the connection diameter help us propose the suitable variant.
Other Wilo series
We do not size the installation hydraulically and we do not install the pump; we quote the TOP-SD variant by code or by the nameplate data of the existing pump.
Updated: 2026-11-12