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Old 05-31-2011, 01:44 PM   #1
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Any hot water pumps out there?

I'm searching for a water pump that can pump the hot water out of a heater tank (approx 140 degrees). The pump seals must be able to handle some sort of antifreeze. Have'nt decided on what type yet. My theory is to use a hot water tank from a MH that has the engine heat option. I'll be using these ports to run a radiant heat for the TT. Radiators & fans have already been worked out.
So far I've been looking at remote water pumps for auto engines. I know they'll handle automotive type antifreeze that will help in transmitting the heat. Any thoughts, comment, parts suggestions would be appreciated. Feel free to run with this idea for your own use, jut fill me in on any details you have worked out.

Ricky
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Old 05-31-2011, 02:05 PM   #2
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Originally Posted by 3 Dog Nite View Post
I'm searching for a water pump that can pump the hot water out of a heater tank (approx 140 degrees). The pump seals must be able to handle some sort of antifreeze. Have'nt decided on what type yet. My theory is to use a hot water tank from a MH that has the engine heat option. I'll be using these ports to run a radiant heat for the TT. Radiators & fans have already been worked out.
So far I've been looking at remote water pumps for auto engines. I know they'll handle automotive type antifreeze that will help in transmitting the heat. Any thoughts, comment, parts suggestions would be appreciated. Feel free to run with this idea for your own use, jut fill me in on any details you have worked out.

Ricky
Grundfos and Taco are commonly used pumps in radiand heat systems. They are normally 110V but they probably have them in 12V but may be a special order type of thing.

Good luck.
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Old 05-31-2011, 02:57 PM   #3
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Ricky,

12v or 120v?

For 120v the best choice is probably one of the wet-rotor pumps Smartstream mentions. They are unavailable in 12v because the design inherently requires alternating current to work.

For 12v, go through the search results for "solar 12v circulating pump" and you'll find lots of choices. "El sid" seems to be a popular maker but I don't have any firsthand experience with them.

Most water pump seals have good compatibility with the propylene glycol antifreeze sold for radiant heat and solar energy uses.
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Old 05-31-2011, 03:16 PM   #4
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March pump - ". March pumps are centrifugal low pressure, no valves or diaphragm to wear out. Water contact parts are brass. No shaft coupling or seal to leak because magnets couple the motor to impeller right through the solid brass housing. Fluids can be as hot as 250 degrees F. PRE-2009 models M809 motor brushes last 10,000 hours.The M809HS motor brushes last 7500 hours. As of 2009, these March pump motors NO LONGER have replaceable brushes. The motor manufacturer claims the new motors should last 30,000-40,000 hours. Just to be clear, these motors DO have brushes but the brushes cannot be replaced.

Ivan Labs: EL-SID pumps use March pump-head with direct electromagnetic drive, no shaft, bearings, brushes, or seals. 10-20 watts. Solar direct Ivan 10 recommends 20 watt solar module; Ivan 20 recommends 30 watt solar module. "
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Old 05-31-2011, 03:20 PM   #5
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I used one of these pumps and two permacool cores to make a heat exchanger once

http://www.meziere.com/displaycatego...id=244,352,372
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Old 05-31-2011, 04:32 PM   #6
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The wet-rotor AC pumps, which are among the most reliable, can't be counted upon to last more than 10 years in typical hydronic applications. At around 3,000 hours a year that would be 30,000 hours.
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Old 06-01-2011, 01:36 AM   #7
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Thanks for all of the quick replies. At first I was thinking of 12 volts only. But hey, wait a minute..... If I opt for the 120 volt AC electric element/ quick recovery on the tank, I would need to be plugged in for heat. This power would be free at campgrounds as I don't anticipate any boondocking. Using this power for heater & pump wouldn't be any less taxing on my electric service then the AC in the summer....Hmmm.....
But if I had a 12 volt DC pump, I could have heat using the propane portion of the tank heater when 120 volts are not available. Can you say inverter?

Karma to you all.

Ricky
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Old 06-19-2011, 11:27 PM   #8
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I am using this pump...

I am using one of these hot water pumps in my radiant heating system in my Airstream installation:

East Coast Solar :: Laing D5 VARIO Bronze PV-Direct Circulating Pump $179.90

It runs on 12 volt but is interesting in that you set the flow you want and the internal electronics tries to maintain that flow even with voltage fluctuations such as ones that you might get with a solar panel.

Malcolm
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Old 06-20-2011, 05:37 AM   #9
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Radiant heat is a great idea. From what I remember looking at my water heater the heat exchanger is nothing more than a 6" piece of tubing welded to the side of the tank. The surface area is adaquate for transfering heat from the engine coolant to the water in the tank over a few hour drive. I'm not sure you would get enough heat transfer to satisify any modest heating requirements. You might consider using the domestic hot water instead.
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Old 06-20-2011, 07:44 AM   #10
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Radiant heat is a great idea. From what I remember looking at my water heater the heat exchanger is nothing more than a 6" piece of tubing welded to the side of the tank. The surface area is adaquate for transfering heat from the engine coolant to the water in the tank over a few hour drive. I'm not sure you would get enough heat transfer to satisify any modest heating requirements. You might consider using the domestic hot water instead.
Have you figured out how many btu's you would need? I doubt that it would be enough for either the 25 or the 34, just the loss from the windows would be too much in a northern climate. Std heaters use 25,000 btu from propane with a large exchange area.
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Old 06-20-2011, 08:57 AM   #11
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How about using the sun

http://cgi.ebay.com/Solar-Hot-Water-...QQcmdZViewItem

http://www.sunmaxxsolar.com/evacuate...collectors.php

http://sunmaxxsolar.com/images/vhp.jpg
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Old 07-02-2011, 08:13 PM   #12
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Have you figured out how many btu's you would need? I doubt that it would be enough for either the 25 or the 34, just the loss from the windows would be too much in a northern climate. Std heaters use 25,000 btu from propane with a large exchange area.
The heat generated would only be used to chase the chill in a 24' TT. It doesn't get that cold here in TN during spring & fall. At least while I would be using it. I'd still be living in the MH throughout the winter.
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Old 07-02-2011, 11:46 PM   #13
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Speak to the guys at EMP they are a great bunch and may have something for your application.

Engineered Machined Products

I'm sure they have both 12 and 24 volt pumps that will handle 140 degrees (I assume that is degrees F not degrees C).
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Old 07-03-2011, 01:04 AM   #14
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Hey Ricky,

Just a thought on the antifreeze type. Both Precision Temp and Aqua Hot require propylene glycol based ďboilerĒ type antifreeze (GRAS) FDA approved in there Hyronic Heating systems. Safer and carries heat better.
http://www.aqua-hot.com/eSource/ecom...Owner_RevA.pdf

Dennis
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