How often should rubber heater hoses be replaced?

[Joe Camper]

If your going to be crawling around under your bus check your rubber brake hoses too.

Another rubber component that is often overlooked is the 2 rubber eyelet ends of the ride height valve linkage. I see lots of these bent and dry and failing. 15 bucks and the new linkage does not come with a new ride height valve. Don't overlook this.

I never put any heater hose of any dimension on anything I plan to keep that is not silicone.

Rubber components.....................IMO 10 yr service interval is an aggressive maintenance cycle for rubber stuff.

I would not want anything older than 12 or 14 yr on mine.

[belfert]

I have decided for this year to not replace the heater hoses.  I already have a ball valve on one side and I'll either add another ball valve on the other side or just bring some parts to plug the line if necessary.

Cost is a consideration, but so is time to figure out how to replumb everything properly.  This is something I need to start in the spring when I have more than 6 weeks of working time left before I leave on a trip.  I also have another project that must be done before I leave, and I just bought a trailer that needs some work.

[Dave5Cs]

Brian,
I have copper 3/4" in 20 foot lengths connected by green silicon hoses for couplers at he ends and copper fittings for turn etc. It goes all the way to the front from the back but there is only 2 for in and out. The 3rd one you have may be an old line or one that used to go to heat exchanger for hot water heater.  I checked out Pex 3/4 and 1 inch and it is 1/2 the price but will take heat up to 200 degrees and can't find out if antifreeze would effect it.
That is all I got, Dave 

[JohnEd]

Does anyone know off hand if PVC yellow(for hot water) stuff will stand up to coolant?  I know that this stuff might be rated for 200 degrees but that is most certainly linked with the expected 90 psi for water systems and ours is 15 psi max.  I doubt you are going to lose all of the structural strength going from 200 degrees to 215.  And I am not trying to play roulette with this.  The metal connectors on pex might give me pause for a over temp  situation given the discrepancy that must exist in the two's coefficients of expansion.  Hose clamped to silicone tubing or glued joints might overcome some of the problem.  MIGHT!  But at these prices being inventive becomes more important than usual.

Anyone?

Thanks,

John