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Old 26-03-2013, 09:15   #1
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Hose Adapters Engine to Water Heater

I'm installing a water heater and need to reduce the 7/8" Westerbeke 58 flow controller fittings to 5/8 Seaward hot water inlet. I've searched for a reducer/adapter/coupling without any luck. Does anyone have a lead on such an adapter or have suggestions for making this connection? The hose length will be 7' each. Seaward calls for non-collapsing heater hose so I'm planning to use Trident hardwall blue stripe 100-0780 or 100-0580 hose. Sound right?

Thanks
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Old 26-03-2013, 09:18   #2
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I've been searching for anything 7/8" hose for about two years............good luck
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Old 26-03-2013, 09:32   #3
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Re: hose adapters engine to water heater

Sailmonkey - Trident 7/8" hardwall flexhose blue stripe etc .. part number 100-0780 at Defender etc. Trident Engine Intake Water & Heater Hose - 7/8 Inch

Has anyone found a way to reduce from 7/8 to 5/8"?
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Old 26-03-2013, 09:38   #4
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Re: Hose Adapters Engine to Water Heater

sorry, I meant hose barbs. I've been looking for hose barbs.
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Old 26-03-2013, 09:57   #5
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Re: Hose Adapters Engine to Water Heater

Will a 3/4 to 1/2 (inside measurements) copper solder type reducer connect those two hose sizes....(non marine item) is that what you need..... a hose to hose connector? Or do you need a threaded on one end...???
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Old 26-03-2013, 20:11   #6
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Re: Hose Adapters Engine to Water Heater

Thanks Cheechako. Hose to hose - and that might do it. I had been toying with the idea of using a copper 1/2 nipple inside regular heater hose 5/8 - which has 7/8 OD, inside 7/8 ID. I'll look for a 3/4-1/2 reducer - should do the trick. Thanks! How long do you think the copper will last?
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Old 27-03-2013, 10:09   #7
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Re: Hose Adapters Engine to Water Heater

Not sure how long it should last, but copper should be good even in seawater. If not enough clamp length, you could solder together to make more length. I have used household copper in a pinch before. Not sure if they make fittings in type L (heavier wall) but if they do you might want to do that. The other option is to put a valve at the joint and a "thread to solder" adaptor on each side of the valve.... 1/2 one side and 3/4 on the other side....
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Old 29-03-2013, 20:00   #8
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Re: Hose Adapters Engine to Water Heater

Just out of curiosity, I searched McMaster, Grainger and Parker, eBay as well as a couple of smaller sites. Nothing for 7/8" barb at all. I suspect it is not manufactured. From my experience with them, it makes sense that Westerbeke would use that size.
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Old 29-03-2013, 20:25   #9
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Originally Posted by sanibel sailor View Post
Just out of curiosity, I searched McMaster, Grainger and Parker, eBay as well as a couple of smaller sites. Nothing for 7/8" barb at all. I suspect it is not manufactured. From my experience with them, it makes sense that Westerbeke would use that size.
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Old 29-03-2013, 22:06   #10
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Re: Hose Adapters Engine to Water Heater

i used copper pipe to connect 5/8" heater hoses .. you really have to clamp it down tight .. but it has been working for 5 years.
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Old 30-03-2013, 04:22   #11
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Re: Hose Adapters Engine to Water Heater

http://www.mcmaster.com/pdf/119/0292.pdf

5/8 barb is readily available, not so much for 7/8
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Old 30-03-2013, 05:11   #12
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Re: Hose Adapters Engine to Water Heater

If I had your problem, on this side of the "pond", I would use a piece 22mm hydraulic pipe (even 316 grade if necessary). This is close enough to 7/8". I would then use a hydraulic crimper to crimo one end down to16 mm (5/8"). Then use a JIC coning tool in each end to create a slight cone, to make sure the hose clamps doesn't come off. Use a hacksaw to roughen the pipe where the hose clamps will be fitted, for good measure.
To make a general 7/8" hose fitting, use a German style 22L cutting ring fitting, to make a 7/8" hose to 3/4" BSP or NPT thread. Hose end done as above.
Your nearest friendly hydraulic shop may be able to help you!
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Old 04-04-2013, 04:51   #13
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Re: Hose Adapters Engine to Water Heater

Goodyear rubber products in downtown saint petersburg has had anything Ive ever needed in the way of fittings and hoses of any type, it they dont have it nobody does.
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Old 04-04-2013, 06:59   #14
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Re: Hose Adapters Engine to Water Heater

There is a branch in Ft Myers as well. They sell Parker fittings. No 7/8" barbs in Parker catalog.
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