EVIL ENERGY 3/4" Silicone Heater Hose 10FT – SAE 20R3, 60 psi working, -67°F to 356°F

EVIL ENERGY 3/4" Silicone Heater Hose is a durable 10-foot coolant and heater line built to SAE 20R3 Class A standards, handling -67°F to 356°F and rated to 60 psi working pressure.

This silicone heater hose combines braided polyester reinforcement with inner and outer silicone layers to deliver extended temperature tolerance and long service life compared with conventional EPDM hoses. It is designed for coolant and heating-system circulation, water transport, steam, and mild chemical service where compatibility allows. The hose is supplied as a 10-foot length with tight dimensional tolerances to simplify cutting and fitting for automotive, marine, or HVAC repairs and custom installations.

What are the exact dimensions and tolerances for this hose?

The hose has a nominal inner diameter of 3/4" (19 mm) and an outer diameter of approximately 1-1/16" (27 mm), with ID and OD tolerances of ±0.4 mm. A 10-foot length is provided to cover most routing needs, and the minimum bend radius is 95 mm to guide routing without kinking.

• Inner diameter: 3/4" (19 mm) ±0.4 mm
• Outer diameter: 1-1/16" (27 mm) ±0.4 mm
• Length: 10 feet (3.05 m)
• Minimum bend radius: 95 mm

How does it perform under pressure and temperature extremes?

This hose is rated for a 60 psi working pressure and has a burst pressure around 203 psi, offering a wide safety margin for typical coolant and heater system use. Its silicone construction maintains integrity across a broad temperature band, making it suitable for both very cold starts and sustained high-heat conditions.

• Working pressure: 60 psi
• Burst pressure: ~203 psi
• Temperature range: -67°F to 356°F (-55°C to 180°C)

What materials are used and what fluids are appropriate?

The hose features braided polyester reinforcement sandwiched between silicone inner and outer layers, which increases longevity and temperature resistance compared with EPDM-based hoses. It is suitable for water, coolant, steam, transport air, and weak acidic or alkaline fluids; however, it is not compatible with alcohols, fuels, engine oil, or lubricants.

• Reinforcement: braided polyester fiber
• Inner/outer: silicone compound
• Compatible with: water, coolant, steam, mild acids/alkalis
• Not for: alcohol, fuel, engine oil, lubricants

How easy is it to install and maintain?

The hose comes as a continuous 10-foot length that can be trimmed to fit with standard hose-cutting tools; its dimensional tolerances and braided construction help ensure reliable clamp seals. Routine inspection for abrasion or chemical damage is recommended, and the silicone outer layer resists cracking and UV degradation better than many rubber alternatives.

• Supplied as 10-foot continuous length for custom cuts
• Trim with proper hose cutters for clean ends
• Use standard hose clamps rated for coolant systems
• Inspect periodically for abrasion or incompatible chemical exposure

Who is this for: The EVIL ENERGY 3/4" Silicone Heater Hose is aimed at vehicle owners, mechanics, restorers, and HVAC or marine technicians who need a reliable replacement or custom hose for coolant and heating circuits. If you need a hose with broad temperature resilience, polyester reinforcement, and precise dimensions for clamp sealing—without compatibility for fuels or oils—this silicone line offers a long-lasting, flexible solution.