Rubber Heater Hose

EPDM Polyester Reinforced Weather Resistant

RRH016-ASH#1

£4.99

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Silicone Hose UK

HolmeBank Business Park, Station Road
Unit 5
Mirfield WF14 8NA
Vereinigtes Königreich

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Opening hours

Monday	07:00 – 19:00
Tuesday	07:00 – 19:00
Wednesday	07:00 – 18:00
Thursday	07:00 – 18:00
Friday	07:00 – 17:00
Saturday	07:00 – 13:00
Sunday	Closed

Bank holidays may affect our opening hours and delivery times.

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Rubber Heater Hose is a high-quality, heat-resistant hose designed for the transfer of hot water and coolant in automotive, agricultural, and industrial systems. Constructed with a smooth black EPDM inner tube, reinforced with high-tensile fibre yarn, and protected by a weather-resistant synthetic rubber outer layer, the hose delivers excellent flexibility, durability, and thermal stability. Conforming to SAEJ20R3 standards, Rubber Heater Hose provides reliable performance under continuous operating temperatures from -20°C to +100°C, with short-term peaks up to +120°C. Its robust design ensures efficient coolant circulation while resisting cracking, ozone, and ageing in harsh working conditions.

Key Features:

Material: Smooth heat-resistant EPDM inner tube with synthetic rubber outer layer.
Reinforcement: High-tensile fibre yarn for pressure strength and dimensional stability.
Operating Temperature: -20°C to +100°C (peak +120°C).
Working Pressure: 10 bar across all sizes.
Burst Pressure: 30 bar (3:1 safety factor).
Internal Diameter Range: 16 mm to 25 mm.
Wall Thickness: 4.5 mm to 5.5 mm depending on size.
Bending Radius: 150 mm to 216 mm depending on diameter.
Standard: SAEJ20R3 compliant.

The EPDM rubber construction provides excellent resistance to heat, coolant additives, and weathering, ensuring long-term durability in demanding environments. Its fibre reinforcement maintains stability under pressure while allowing flexibility for installation in confined spaces. The smooth bore design supports efficient coolant flow, reducing the risk of overheating or performance loss in engine and machinery systems. The outer synthetic rubber layer resists abrasion, ozone, and environmental wear, making the hose suitable for prolonged service life in both indoor and outdoor use.

Applications include engine cooling and heating systems, agricultural and construction machinery, marine engines, and general-purpose hot water or coolant transfer. Rubber Heater Hose is widely used in automotive, industrial, and agricultural sectors where reliability, heat resistance, and flexibility are critical for system efficiency and safety.

Specifications

Type: Heater Hose
Colour: Black
Standard: SAEJ20R3
Working Pressure: 10bar
Bursting Pressure: 30bar
Coil Length: 20m

Size Guide

Inside Diametermm	Outside Diametermm	Wall Thicknessmm	Bending Radiusmm	Coil Weightkg
16	25	4.5	150	8
19	29	5.0	174	10
22	32	5.0	192	12
25	36	5.5	216	14

Measurements are nominal and may vary slightly.

How to measure ID

1

Measure the pipe, not the old hose

Heat and age make a used hose swell and go out of round. Take your reading across the metal outlet the hose slides onto — that measurement is your ID.

2

Use vernier calipers

Set the outer jaws across the widest point of the pipe. A tape measure round a curve reads low by a millimetre or two — enough to buy the wrong size.

3

Take three readings, keep the largest

Rotate 60° between each. If they disagree the pipe is oval; size to the biggest figure so the hose still seals.

4

Round to the nearest listed bore

Never go up: a bore wider than the fitting will not grip, whatever the hose is made of. If you land between listed sizes take the smaller bore, and secure it with a clip.

Order by ID, always. Every hose on this site is listed by internal diameter. OD is given for clearance only — it changes with wall thickness and ply count, so it is never the ordering size. On reducers, quote both ends, largest first.

Construction

Outer cover

Smooth heat-resistant EPDM inner tube with synthetic rubber outer layer

Reinforcement

High-tensile fibre yarn

Pressure strength and dimensional stability · -20°C to +100°C (peak +120°C) · 10 bar across all sizes · 30 bar (3:1 safety factor)

Conforms to SAEJ20R3.

4 bore sizes16mm to 25mm internal diameter

30 bar burst10 bar working on the smallest bore

SAE J20 R3 built to standardthe automotive coolant hose standard

Rubber, done right. EPDM throughout.

Coolant-rated rubber for the jobs that do not need silicone money.

INTERNAL DIAMETERS

16mm to 25mm

RATED

−20°C to +100°C

WORKING PRESSURE

10 bar across all sizes

BUILT TO

SAE J20 R3

SOLD BY

The metre

Specification at a glance

Across the whole 16mm–25mm range.

16mm –25mm Inside diameter

25mm –36mm Outside diameter

4.5mm –5.5mm Wall thickness

150mm –216mm Bending radius

10bar Working pressure

30bar Bursting pressure

Inside diameter (mm)	Outside diameter (mm)	Wall thickness (mm)	Working pressure (bar)	Bursting pressure (bar)	Bending radius (mm)	Coil weight (kg)	Coil length (m)
16	25	4.5	10	30	150	8	20
19	29	5.0	10	30	174	10	20
22	32	5.0	10	30	192	12	20
25	36	5.5	10	30	216	14	20

Show all 4 sizes → Show fewer

How it's built

Two layers, each doing one job.

Two layers, from the outside in: smooth heat-resistant EPDM inner tube with synthetic rubber outer layer and high-tensile fibre yarn. Each one is doing a different job.

1

Outer cover

Smooth heat-resistant EPDM inner tube with synthetic rubber outer layer

2

Reinforcement

High-tensile fibre yarn

Pressure strength and dimensional stability-20°C to +100°C (peak +120°C)10 bar across all sizes30 bar (3:1 safety factor)

Product gallery

Frequently Asked Questions.

Answers to the questions we’re asked most about sizing, fitment and performance.

Still can't find your answer?

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What is it used for?

Carrying hot coolant from the engine to the cabin heater matrix and back, and hot water in agricultural and industrial systems.

What size and length do I order?

Order by internal diameter, matched to the outside diameter of the pipe stub or spigot it slides over. Measure the pipe with vernier callipers rather than the old hose, which stretches in service and reads large. Available in internal diameters from 16mm to 25mm, lengths from 1 Metre to 20 Metres (Full Coil). Full coils work out considerably better value per metre than cut lengths.

What standard is it built to?

It is manufactured to SAE J20 R3. Buying to a recognised standard matters here - it means the construction, pressure rating and performance have been benchmarked rather than simply described.

Can I use it for fuel or oil?

No - EPDM and general-purpose rubber have poor resistance to hydrocarbons and will soften, swell and eventually fail. For fuel and oil use our SAE J30 R6 rubber hose or a fluorosilicone-lined silicone hose.

How do I know when it needs replacing?

Squeeze it. Hard and brittle, or spongy and swollen, both mean it is done. Look for surface cracking when you flex it and crusty residue or staining round the clips, which indicates seepage. Replace on condition rather than waiting for a failure.

How should it be secured?

Proper hose clips, one at each end, positioned squarely over the barb or spigot. Support long runs with rubber-lined P-clips so the hose cannot chafe against a bracket, panel or wiring loom, and keep it clear of exhaust components.