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Old 02-10-2012, 05:27 PM   #1
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Hydronic Heating System on Newmar Essex and King Aire

Do the Essex and King Aire motorhomes have a 2 zone hydronic heating system that has the ability to separately heat doemstic hot water and the anti freeze solution for the coach heating radiators? I understand that the "Precision Temp Jr." system is a single zone, which necessitates manually turning a valve for winter and summer season use. If the Essex and King have a 2 zone system then I assume that the thermostat inside the coach will then automatically control an electric valve on the antifreeze zone loop so that the heated solution will circulate only when the theromstat demands heat.
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Old 02-10-2012, 05:38 PM   #2
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Well they used to come with HydoHot, made by AquaHot, but now they come with Oasis (Spelling?) All are 3 zones plus continuious hot water. So there!


Peter
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Old 02-10-2012, 06:06 PM   #3
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Wow!! so thats why these guys cost so much! So I guess there are 3 or 4 control valves to break and replace when they go bad. Thanks for the info.

Bruce
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Old 02-10-2012, 06:17 PM   #4
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Look in the Quick Tips link all the info is there plus layouts of systems.
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Old 02-10-2012, 08:52 PM   #5
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Quote:
Originally Posted by BucketList View Post
Wow!! so thats why these guys cost so much! So I guess there are 3 or 4 control valves to break and replace when they go bad. Thanks for the info.

Bruce

Yep, even the toilet is expensive.

Sue
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Old 02-10-2012, 10:33 PM   #6
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The Oasis has 3 zones (Living Room, Bathroom, Bedroom) plus a "summer" loop, which supplies hot water. All the distribution plumbing is in a self-contained unit, separate from the actual burner unit.
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Old 02-11-2012, 06:19 PM   #7
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I'll make a correction to some of the above for the AH system and perhaps Roger Berke/others will chime in for the Oasis.

On the AH there are no "control valves" used at all. (Note there is a manual traditional domestic hot water mixing valve to reduce scalding.) Instead the AH heating zones toggle on/off the fans used behind each heat register in a given zone. It's basically a fan forced hot water type system. AH uses 2 circulation pumps to pump the heated coolant in two loops. Multiple heat registers AND multiple zones may be on each coolant loop. A demand for heat in a zone will trigger the fan(s) attached to the registers in that zone and the appropriate circulation pump. It's that simple.

Domestic hot water demand takes priority (via the control board and is easily overridden) and shuts off ALL heat zones while hot water is demanded. There is a also small "stir" pump that helps heat the domestic hot water loop.

If an engine pre-heat kit is installed that is a separate circulation pump for the engine coolant through a separate heat exchanger coil inside the AH.

A basement heater (register) is actually the AH 4th heating zone and resides on the same circulation loop as (usually) the rear 2 heat zones.

The circulation pumps in AH are magnetic drive and exceedingly rugged and dependable and very expensive ~$400 I think. In fact, the entire AH system is extremely rugged. The AH supplied registers are rock solid requiring zero maintenance. The burner assembly (made by Wabasto) is also exceedingly rugged.

Oasis originally came out of the marine industry and given that heritage infers the same, if not greater, durability.
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Old 02-12-2012, 11:32 AM   #8
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Thanks to all for the info and link to the Oasis system. Question to FlyingDiver and SayDiver...... Does the King Aire and Essex have a heated loop for the basement as well? "ottffss" states that the previous used AH systems may have had a loop for the basement.
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Old 02-12-2012, 11:53 AM   #9
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Yes, there's a heater unit in the water bay. I forget which loop it's on, but if you have the furnace on, the water bay will stay warm.

joe
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