The supply is hotter and less dense, the water shrinks going through the heater core.

Peter

On May 26, 2012, at 8:31 PM, Brian Toscano wrote:

Wouldn't that support the theory that the return hose should be larger?

The return hose is 5/8 and the supply is 11/16.


On Sat, May 26, 2012 at 7:27 PM, Fmiser <fmi...@gmail.com> wrote:

Brian Toscano wrote:

I tried using a length of Gates heater hose, but because of
the bends, the hose either kinks or narrows by the heater
core.  I could plumb in a 45 degree fitting, I but found the
dealer part numbers for these hoses.  I will just pay for the
dealer hoses and eliminate the extra fitting.  I also noticed
that the return line is 5/8" but the supply line is 11/16".
I'm not sure why they made the return line 1/16" bigger.

After the resistance of flowing through the heater core, a lower
resistance hose allows it to flow at the same rate as the higher
pressure inlet hose.

--   Philip



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