Wilo

Wilo was founded in 1872 in Dortmund, Germany, by Caspar Ludwig Opländer, originally as a copper and brassware factory producing distillation equipment before shifting toward pump and building technology as German cities expanded.

Five generations later, Wilo has grown into a multinational technology group with more than 90 production and sales companies worldwide and around 9,000 employees, with global headquarters still based in Dortmund.

Product Lines

Wilo's circulator pump offerings span the Stratos family, covering compact residential models such as the Stratos PICO and ECO through commercial-grade Stratos MAXO units built for HVAC systems, along with stainless steel MAXO-Z and ZD variants suited to drinking water and twin-pump setups.

The Star and Star-S series round out the residential and light commercial range, offered in cast iron construction for hot water heating, industrial circulation, cold water, and air conditioning systems, and in bronze construction for domestic hot water applications, while higher-capacity Stratos GIGA in-line pumps serve larger-scale installations.

Why Contractors Specify Wilo

HVAC and plumbing contractors specify Wilo circulators for the range of variable-speed, electronically commutated motor technology built into the Stratos line, which lets a pump adjust output to actual system demand rather than running at a fixed speed.

A broad model range, from compact residential circulators to high-capacity commercial in-line pumps, lets contractors stay with one manufacturer across hydronic heating, cooling, and domestic hot water recirculation projects of different scales, simplifying parts familiarity from job to job.

How to Choose Wilo Products

Selecting a circulator starts with matching flow rate and head requirements to the hydronic system being served, then deciding between a fixed-speed Star or Star-S model for straightforward applications or a variable-speed Stratos model where energy savings and automatic load matching are priorities.

Material choice matters for the application: bronze construction suits domestic hot water circuits, cast iron is appropriate for closed heating, cooling, and industrial circulation loops, and stainless steel MAXO-Z and ZD configurations are worth considering on drinking water systems or where pump redundancy is a priority.

Frequently Asked Questions

What is the difference between Wilo Star and Stratos circulator pumps?

Star series pumps run at fixed speeds and suit straightforward heating or cooling circuits, while Stratos pumps use variable-speed electronically commutated motor technology to automatically adjust output to system demand, often reducing energy use.

Can a Wilo circulator be used for domestic hot water?

Yes, certain models, including bronze Star pumps and stainless steel Stratos MAXO-Z and ZD variants, are built specifically for domestic hot water and drinking water applications.

What does ECM mean on a Wilo pump spec sheet?

ECM stands for electronically commutated motor, a brushless motor design that lets the pump vary speed efficiently in response to system load.

Are Wilo pumps suited to large commercial systems?

Yes, the Stratos MAXO and GIGA lines are built for commercial HVAC and large-scale installations, with GIGA models designed for higher-capacity in-line applications.

What construction material should be chosen for a Wilo circulator?

Material choice depends on the fluid circuit: cast iron units fit closed heating, cooling, and industrial loops, while bronze or stainless steel models are intended for domestic hot water or drinking water systems where corrosion resistance matters.