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Most heater hose I've seen is rated to 275 F. As Weeder mentioned, I put some thermal sleeving on mine where they run close to the block or exhaust - just as a precaution.
If you use silicone hose the temp rating bumps up to something like 350 F.
In addition, I picked up a molded 5/8" silicone 90 degree "L" to make the transition from the exit of the Forester/WRX coolant pipe to the OEM heater hose cleaner.
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Slow is smooth, and smooth is fast
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