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Old 05-29-2023, 05:51 PM   #1
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Older water heaters

Hi I am new here and recently purchased my first RV which is a 95 holiday rambler Endeaver LE. I am in the process of replacing the water heater which besides the Pex in and out lines it had two black rubber hoses connecting to ports on tank. The new tank does not have ports or connections for these hoses. Wondering what they are for???
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Old 05-29-2023, 05:57 PM   #2
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The hoses are most likely the cold water in and hot water out. There has to be these on the new tank. Model number of old and new and pictures please.

Edit: possibly for your coolant system to heat water while driving?
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Old 05-29-2023, 06:27 PM   #3
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What you have is a "motor aid" tank. Those extra hoses run engine coolant thru a pipe welded on the exterior of the tank so that the tank is heated by hot engine coolant. This way you have hot water when you get to where you are going. You can splice the hoses together if your new tank doesn't have that option
2002 Country Coach Intrigue
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Old 05-29-2023, 08:24 PM   #4
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We had that on our boat, tied to the Stbd main. It was a great feature that gives you hot water on demand all the time! It was great when we were doing the crossing home on Sunday's as we would usually leave first thing in the morning for better seas, and would take showers enroute on the way home. The stbd main ran about 10 degrees cooler than the port with this set up, probably due to excess coolant moving through the system. I may try to add this to my RV.
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Old 05-30-2023, 02:35 PM   #5
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As Don said, your coach & its original heater had the Motoraid feature, but your replacement does not. Either return the new one and get a Motoraid compatible in its place, or splice the two hoses together and do without the Motoraid feature. It's a nice convenience to arrive at your site with already heated water, but hardly a necessity.
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
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Old 05-30-2023, 03:21 PM   #6
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Agree with other posters
If you already disconnected black hoses to you should have seen engine coolant to confirm
Be ready to plug if you have not yet!!

Oh and welcome to the forum...lots of knowledgeable folks here

Greg and Vicki R.
2004 Country Coach Intrigue "Sweet Serenade"
40' Tag Axle Quad slide CCI #11811
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heat, heater, water, water heater

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