Onyx 6m 130mm High Efficiency Circulating Pump

Description

The Onyx CEH25-60/130 is a high-efficiency, variable-frequency central heating circulator built for the job most UK domestic systems need doing: moving hot water from the boiler or heat source out to radiators and underfloor heating circuits and back again, quietly and without wasting electricity.

Its model code tells you exactly how it fits. The 25 is the pump connection size, the 60 is a 6 metre maximum head, and the 130 is the 130 mm port-to-port installation length — the standard domestic format, which makes it a straightforward like-for-like replacement for tired fixed-speed pumps of the same size.

6 m

Maximum head

130 mm

Port-to-port length

25

Connection size

230 V

Single-phase supply

Variable

Frequency-controlled speed

1.95 kg

Approx. weight

Good to Know

Reading the model code: CEH25-60/130 = 25 connection size · 60 decimetres (6 m) maximum head · 130 mm installation length. Match the last number to the pump you are replacing and the pipework will not need altering.

Check Before You Buy

Before ordering, measure the port-to-port length of your existing pump (it must be 130 mm) and check that your system does not need more than 6 m of head. Onyx does not publish a full performance curve online, so for larger or high-resistance systems we recommend confirming duty requirements with us before you buy.

Safety & Regulations

Electrical connection must be carried out by a competent person in accordance with BS 7671. Isolate the electrical supply and close the pump isolating valves before removing an existing pump — system water can be hot and under pressure. Heating systems should be cleaned and protected with inhibitor in line with BS 7593 to protect the new pump.

Key Features

6 m maximum head

A 6 metre head covers the pressure demand of the vast majority of domestic radiator and underfloor heating systems.

130 mm drop-in length

The standard 130 mm installation length means it slots straight into the space left by an old pump of the same size — no pipework changes.

Variable-frequency control

Intelligent variable-frequency operation adjusts pump speed rather than running flat out, cutting electricity use compared with older fixed-speed circulators.

Quiet running

Designed for ultra-low noise operation, so it will not announce itself from an airing cupboard or kitchen boiler cupboard.

Radiators & underfloor heating

Suitable for central heating radiator circuits and underfloor heating systems, in new installations or as a replacement.

Durable construction

Temperature-resistant design and durable motor bearings for dependable, long-term operation in continuously running heating systems.

Technical Specifications

Identification

Brand

Onyx

Model

CEH25-60/130

Manufacturer part number

CEH25-6-130

Pump type

Variable-frequency central heating circulator

Hydraulic

Maximum head

6 m

Installation length (port-to-port)

130 mm

Connection size

25

Electrical & Physical

Power supply

230 V single-phase

Weight

Approx. 1.95 kg

Application

Suitable for

Domestic central heating (radiators) and underfloor heating

Installation

New systems and like-for-like replacement of 130 mm, 6 m pumps

Frequently Asked Questions

What does 25-60/130 mean?

25 is the connection size, 60 is the maximum head in decimetres (6 m) and 130 is the installation length in millimetres. The installation length is the key dimension when replacing an existing pump.

Will it replace my old central heating pump?

If your existing pump has a 130 mm port-to-port length and your system is served by a 6 m head pump, it is a direct swap using your existing pump valves. Always fit new union washers when changing a pump.

Can I use it for underfloor heating?

Yes. It is suitable for underfloor heating circuits as well as radiator systems. On larger UFH installations check the required flow and head against the manifold design before ordering.

Is it suitable for domestic hot water (secondary) circulation?

It is sold as a central heating circulator. For secondary hot water return loops on potable water, choose a pump specifically rated for drinking water, typically with a bronze or stainless steel body.

Who should install it?

Plumbing work can be carried out by a competent heating engineer; the electrical connection must comply with BS 7671. The system should be cleaned and inhibited to BS 7593 to maximise pump life.

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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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Required Heating

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