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Old 29-12-2014, 08:08   #1
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Raw Water Hose

Merry Christmas, everyone. All of my raw water hose from the hull to/from pump and into heat exchanger needs to be replaced. The existing hose appears to be wet exhaust hose. If my research is correct, the ABY stipulates wet exhaust hose for discharge from HX into exhaust mixing elbow. My question is whether or not "wet exhaust" grade hose is needed or recommended between raw water intake and HX. As ya'll know, wet exhaust hose ain't cheap (~$10/ft). I don't mind the cost if that is what is needed; however, I don't want to arbitrarily burn money for a system that is over engineered if I can help it.

Is wet exhaust hose the standard or is there a recommended alternative that is more reasonably priced but won't keep me up at night?

For reference, I have a Universal M3-20b that is freshwater cooled. The Parts manual only specifies 5/8" hose (Westerbeke part # 299823).

Thanks!
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Old 29-12-2014, 08:29   #2
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Re: Raw Water Hose

All the suction lines need to be wire reinforced, so that should be wet exhaust. I would never use anything but wet exhaust hose on any raw water lines. Piece of mind and the risk of flood damage makes the extra cost worth it.


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Old 29-12-2014, 08:38   #3
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Re: Raw Water Hose

Yes it should be wire reinforced for suction, but does it need to be exhaust grade?. I replaced my 1988 inward hoses with high grade "see through"hose and have been happy with that.
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Old 29-12-2014, 08:59   #4
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Re: Raw Water Hose

Don't use clear vinyl. You can use heavy duty heater hose. Double clamp with non-perforated all-stainless (Awab) clamps. No requirement to use wire-reinforced, but use your head in selecting something that won't collapse.
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Old 29-12-2014, 09:26   #5
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Re: Raw Water Hose

Thank you for the input. Definitely not trying to skimp, just want to make sure I'm not overspending!
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