EVIL ENERGY 3/4" Heater Hose 20ft – 3/4in ID EPDM Coolant Line, SAE 20R3, 100 PSI Working

EVIL ENERGY 3/4" Heater Hose 20FT is a durable EPDM coolant hose built to SAE 20R3 standards for radiator, heater, and overflow connections.

This 20-foot length of 3/4" (19mm) inner-diameter hose is engineered for engine cooling and hot water heater uses where a reliable, flexible coolant line is needed. Constructed from EPDM rubber and rated for continuous service from -40°F to 257°F, the hose combines temperature resilience with chemical compatibility for antifreeze, water, and coolant blends. It is designed to meet SAE 20R3 Standard Wall Class D-2 requirements, offering robust working and burst pressure margins for automotive and industrial cooling circuits.

How tough is this hose for everyday engine cooling?

The EVIL ENERGY heater hose delivers dependable mechanical strength with a 100 psi working pressure and a 300 psi burst pressure, giving margin for common pressure spikes in cooling systems. EPDM construction resists heat, steam and many coolant additives, maintaining flexibility and service life across a wide temperature band.

• Working pressure: 100 psi for continuous system use.
• Burst pressure: 300 psi safety margin for transient spikes.
• Temperature range: -40°F to 257°F for cold starts and high-heat conditions.
• Material: EPDM rubber resists steam, heat and common coolant chemicals.

Will this hose fit my vehicle or heater setup?

The hose has an inner diameter of 3/4" (19mm) with an outer diameter of 1.10" (28mm), tolerances provided to help ensure compatibility with standard clamps and fittings. With a 20-foot spool length you can cut to custom runs for radiator-to-overflow, heater core connections, or replacement sections in tight engine bays.

• ID: 3/4" (19mm) with ±0.6mm tolerance for accurate fitting.
• OD: 1.10" (28mm) with ±0.8mm tolerance for clamp sizing.
• Length: 20 feet to cover long runs or multiple cuts.
• Min bending radius: 152mm for routing without kinks.

What fluids and conditions can this hose handle?

Designed for coolant system service, the EVIL ENERGY hose is compatible with water, antifreeze mixtures and many coolant formulations typically used in automotive and industrial equipment. Its EPDM composition tolerates the thermal cycling and chemical exposures common in radiator and heater applications without rapid degradation.

• Compatible media: coolant, antifreeze, water, and similar fluids.
• Resists heat, steam and typical coolant additives.
• Meets SAE 20R3 Standard Wall Class D-2 for coolant hose performance.

How easy is it to install and route this hose?

The hose’s flexibility and defined minimum bending radius make routing straightforward in cramped engine compartments and heater enclosures. Cut to length with a sharp blade or hose cutter, secure with standard clamps, and use the tolerance specifications to choose matching fittings for leak-free joins.

• Cut-to-fit 20 ft spool for custom installations.
• Min bending radius: 152mm to prevent kinks and maintain flow.
• Use standard worm-drive or crimp clamps sized for 1.10" OD.

Who this is for: EVIL ENERGY’s 3/4" Heater Hose is suited for mechanics, DIY vehicle owners, fleet maintenance teams and HVAC technicians who need a reliable, flexible coolant line for radiator, heater core, overflow, or hot-water heater connections. If you require an SAE 20R3-compliant hose with broad temperature tolerance and chemical compatibility for antifreeze/water mixtures, this hose is built to provide a long-lasting replacement or custom routing solution.