Stuart Turner ST 25/80-180 Heating Circulator | 47075 | 8 m Head

Description

The Stuart Turner ST 25/80-180 (47075) is a high-head central heating circulator delivering up to 8 m head and 4.5 m³/h with an EEI of 0.20. It is designed for closed-loop systems that need more pressure than a standard 6 m pump can provide.

The 180 mm port-to-port length suits larger domestic heating circuits and replacement of older 180 mm pumps, and it is backed by a 5-year warranty. Proportional-pressure control keeps performance matched to demand.

8 m

Maximum head

4.5 m³/h

Maximum flow

57 W

Maximum power

EEI 0.20

Energy efficiency

180 mm

Port-to-port length

5 years

Warranty

More head for larger systems

With 8 m maximum head, the ST 25/80 suits longer pipe runs and higher-resistance circuits where a 5.8 m pump falls short.

Closed heating systems only

The ST 25/80 has a cast iron body and is designed for closed-loop central heating circuits. Match the 180 mm port-to-port length to your existing pump.

Safety

Isolate the electrical supply before any work. The motor casing and pump body get very hot in normal use. Installation must be carried out by a qualified person, with the pump earthed via its supply cord, and a 30 mA RCD is recommended in the supply circuit. Never run the pump dry.

Key features

High-efficiency ECM motor

Permanent magnet ECM technology with an EEI of 0.20 keeps running costs low and complies with EuP/ErP requirements.

Proportional pressure control

Choose from three preset proportional-pressure curves or three constant-power curves. The system-pressure control adapts pump performance to demand.

One-button settings

A single illuminated button on the terminal box cover selects the setting: blue for lowest, green for medium and yellow for highest.

Automatic venting cycle

An automatic venting cycle helps clear trapped air at start-up. Any remaining air can be cleared by stopping and restarting the pump.

Reliable construction

Canned-rotor design with ceramic bearings, a Noryl impeller and continuous (S1) duty rating for long service.

Higher output

Up to 8 m head and 4.5 m³/h with a maximum power of 57 W, and a 5-year warranty.

Specification

General

Brand

Stuart Turner

Model

ST 25/80 (180) Circulator

Manufacturer part number

47075

Application

Closed-loop central heating circulation, high head

Warranty

5 years

Hydraulic

Pump connections

1½ in.

Port-to-port length

180 mm

Maximum head (closed valve)

8 m

Maximum flow

4.5 m³/h

Water temperature

-10 to +110 °C

Maximum working pressure

10 bar

Electrical

Supply

230 V, single phase, 50 Hz

Maximum power P1

57 W

Full-load current

0.5 A

Fuse rating

5 A

Insulation class

F

Enclosure protection

IP44

Construction and operation

Pump type

Centrifugal, canned rotor

Pump body

Cast iron

Impeller

Noryl

Bearings

Ceramic

Duty rating

Continuous (S1)

Typical noise

43 dB(A)

Maximum ambient air temperature

40 °C

Weight

2.4 kg

Conformity

UKCA and CE

Frequently asked questions

When should I choose the ST 25/80 over the ST 15/60?

Choose the ST 25/80 when the system needs more than 5.8 m head, for example long pipe runs or high-resistance circuits. It also has a 180 mm port-to-port length.

Which way up can it be fitted?

The motor shaft must be horizontal. The flow through the inlet and outlet can be vertical or horizontal, and the terminal box can be repositioned if access is limited.

How do I change the pump setting?

Press the button on the terminal box cover to step through the three curves: blue is lowest, green is medium and yellow is highest. Hold it for over 5 seconds to switch between proportional-pressure and constant-power modes.

What fluid can it pump?

Clean water, or clean water mixed with antifreeze suitable for central heating systems. The liquid must not contain aggressive or explosive additives, mineral oils or solid or long-fibre content.

How long is the warranty?

The ST 25/80 carries a 5-year warranty.

BTU Calculator

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Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

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