Wilo Para A-Rated Underfloor Heating Pump and Mixing Unit – 3kW Output, 6m Head Circulator

Efficient Heating for Individual Rooms

Introduce comfortable, energy-efficient warmth into smaller areas of your home with this single-zone underfloor heating pump and mixing assembly. Supplied with the high-efficiency Wilo Para 25/6-43/SCU circulation pump, this compact unit provides a practical solution for extending water-based underfloor heating without the need for a major overhaul of your existing heating installation.

Designed for spaces such as bathrooms, home extensions, conservatories and other compact rooms, the unit can serve areas of up to 20m², subject to pipe spacing and heat demand. It connects to a compatible existing central heating circuit, allowing you to introduce underfloor heating while keeping installation work to a minimum.

The integrated Wilo Para circulator combines electronically controlled operation with low electricity consumption, operating within a power range of 3W to 43W and achieving an Energy Efficiency Index (EEI) of 0.20 or lower. A built-in thermostatic blending valve adjusts the water temperature supplied to the floor circuit, helping maintain comfortable heating conditions and reduce the risk of excessive floor temperatures.

Heating Capacity and Room Suitability

• Up to 20m²: Suitable for smaller rooms using underfloor heating pipes installed at 200mm centres.

• Up to 15m²: Appropriate for installations with 150mm pipe spacing, depending on the required heating output and system design.

• Rated heating output of 3kW: Provides a practical heating solution for individual rooms when supported by the available heat source and the property's heat-loss requirements.

This pump pack is particularly useful when installing underfloor heating in a single room, rather than investing in a complete property-wide system. It offers a targeted way to improve comfort in selected areas while retaining the existing heating infrastructure.

Main Product Features

High-Efficiency Wilo Circulation Technology

The assembly incorporates the Wilo Para 25/6-43/SCU circulator, featuring an electronically commutated motor and a glandless construction. This design supports efficient water circulation, reduced electrical consumption and quieter operation compared with many traditional circulation pumps.

Circulation Head of up to 6 Metres

The pump is designed for domestic heating applications requiring a nominal head of 6 metres, with the manufacturer's performance curve determining the actual operating head available under specific flow conditions. It is suitable for compatible underfloor heating circuits and manifold arrangements when correctly sized.

Adaptive Electrical Consumption

With a stated input power range of 3–43W, the circulator can adjust its operation to suit the demands of the heating circuit. This helps avoid unnecessary electricity consumption when full pump output is not required.

Multiple Operating and Control Settings

The pump offers electronic control options, including variable differential pressure (Δp-v), constant differential pressure (Δp-c) and selectable constant-speed settings. Its LED indicators and push-button interface allow the operating mode to be selected and monitored conveniently.

Integrated Thermostatic Water Mixing

The built-in thermostatic mixing valve combines hotter water from the primary heating circuit with cooler return water from the underfloor loop. This regulates the temperature entering the floor circuit, helping deliver consistent heat and protect against excessive supply temperatures when correctly adjusted and installed.

Compatible with a Range of Heat Sources

Subject to system design, temperature requirements and hydraulic compatibility, the pump pack can be incorporated into heating installations supplied by:

• Gas and oil-fired boilers.

• Wood-burning boilers and suitable solid-fuel heating systems.

• Air-source heat pumps.

• Ground-source heat pumps.

• Solar thermal systems used alongside an appropriate heat source.

• Other compatible renewable and low-temperature heating arrangements.

Compact Construction and Straightforward Installation

The space-saving assembly is designed to connect directly into suitable heating pipework, reducing the need for additional mounting hardware in compatible installations. Its compact format makes it particularly useful where installation space is restricted.

It may also be considered when upgrading certain older circulation pump installations, including compatible Wilo RS25/6 and Yonos PICO models. However, pipe dimensions, electrical connections, installation length and hydraulic requirements should be checked before selecting it as a replacement.

Economical Operation and Modern Heating Compatibility

Efficient circulation, adjustable pump performance and controlled underfloor water temperatures help support economical heating operation. The unit is also suitable for consideration in lower-temperature heating systems, provided the heat source, floor circuit and overall system configuration are compatible.

Temperature Regulation and Heating Management

The integrated thermostatic blending arrangement helps maintain an appropriate water temperature for the underfloor heating circuit, providing an additional level of control when connecting floor heating to a conventional radiator system or another compatible heat source.

Its principal functions include:

• Automatic water blending: Mixes primary heating water with cooler return water to achieve the selected mixed-water temperature.

• Controlled floor heating: Helps limit excessive water temperatures entering the underfloor circuit.

• More consistent heat distribution: Supports steady circulation throughout the connected floor-heating loop.

• Single-room zoning: Enables underfloor heating to be introduced into a specific area without converting the entire property.

• Reduced installation disruption: Makes use of a compatible existing heating system, subject to the required pipework and control arrangements.

For best results, the installation should be sized according to the room's heat loss, underfloor pipe layout, required flow rate and available pump performance. Appropriate temperature limits, independent safety controls where required, and compatible system components should also be provided to ensure safe and reliable operation.

An Ideal Solution for Small Underfloor Heating Projects

The Wilo Para A-Rated single-room pump and mixing pack combines efficient circulation, thermostatic water blending and compact installation into one practical assembly. It is designed for homeowners and installers seeking to add water-based underfloor heating to a smaller room while making effective use of an existing central heating system.