EVIL ENERGY 3/4" Silicone Heater Hose 10ft — SAE J20R3 Class-A, 60 PSI, High-Temp Durable

EVIL ENERGY's 3/4" silicone heater hose is a 10-foot, SAE J20R3 Class-A coolant and heater line built for high-temperature durability and reliable 60 psi working pressure.

This premium silicone hose combines braided polyester reinforcement with inner and outer silicone layers to handle demanding temperature swings, resist aging, and extend service life compared with standard EPDM hoses. Sized at a 3/4" inside diameter (approximately 19 mm) with a 1-1/16" outside diameter, the hose is supplied in a continuous 10-foot length and meets SAE J20R3 Class A specifications for heater applications.

What temperatures and pressures can this heater hose handle?

The EVIL ENERGY silicone heater hose is engineered for extreme environments, performing from -67°F to 356°F (-55°C to 180°C). It supports a working pressure of 60 psi with a burst pressure around 203 psi, offering a secure margin for typical automotive and heating-system use.

• Temperature range: -67°F to 356°F (-55°C to 180°C)
• Working pressure: 60 psi
• Burst pressure: approximately 203 psi
• Minimum bend radius: 95 mm to avoid kinking

Which fluids and systems is this hose suitable for?

Designed primarily for heater and coolant lines, this silicone hose safely transports water, coolant, steam, transport air, and mild acids and alkalis. It is ideal for automotive cooling systems, residential or commercial heating piping, and water heater connections.

• Compatible: coolant, water, steam, transport air, weak acids and alkalis
• Not for use with: alcohol, fuels, engine oil, or lubricants
• Typical applications: radiator heater lines, HVAC heater cores, water heaters

How is the hose constructed and how does that improve performance?

This hose uses braided polyester reinforcement sandwiched between silicone inner and outer layers. The silicone resists hardening, cracking and thermal degradation better than many EPDM alternatives, which helps preserve flexibility and sealing performance over long service life.

• Inner and outer silicone layers resist heat and aging
• Braided polyester provides reinforcement and pressure resistance
• Manufactured to SAE J20R3 Class A standards for heater hoses

What are the hose dimensions and installation tips?

The hose ID is 3/4" (19 mm) with a standard tolerance of ±0.4 mm and an OD near 1-1/16" (27 mm). Supplied as a 10-foot continuous length, cut to fit and use compatible clamps rated for silicone hoses; avoid over-tightening to prevent deformation.

• Inner diameter: 3/4" (19 mm), tolerance ±0.4 mm
• Outer diameter: ~1-1/16" (27 mm), tolerance ±0.4 mm
• Length: 10 feet, cut-to-fit installation
• Minimum bend radius: 95 mm; use clamps designed for silicone hose

Who is this for? EVIL ENERGY's 3/4" silicone heater hose suits mechanics, DIY car enthusiasts, HVAC professionals, and installers who need a long-lasting, high-temperature hose for coolant and heater lines. If you require a flexible, heat-resistant replacement for factory heater hoses or a robust line for heating appliances, this hose offers reliable performance and clear installation guidance. Note that it’s not intended for fuel, oil, or alcohol service—choose application-appropriate materials for those fluids.