200A and 202 reproduction
frames back
in stock.

Lhoffm4coleman
Greetings Programs
Im working on a Coleman Hot Water On Demand unit.  Its heating so well, it started to melt the venting slats at the top.  However, I cannot get it to pull water from the jug.  

1.  How do I tone down the heat so it does not want to melt its own housing?

2.  Am I looking to break free an impeller in the pump head?  If so, how does one go about opening it?

3.  Whats the secret to cracking open the unit housing?  I have removed the screws holding the side on, but cannot massage the side off.  I dont want to crack or break it.

4.  Is there a troubleshooting guide or repair manual out there?  I really like the concept, but for the infrequent use camp appliance, it seems quite finicky.  

5.  Is it practical to replace the 6v battery with a 12v system?  Is there a hack?  

I know I can just boil water over a stove, but Id like this to work too!

Thanks in advance...
Quote
Kansas John
@arryk spent some time working on the older green version, I think.  He might be of assistance if I’m remembering who I sold my broken one to.
John M. Lawrence, KS
ICCC #1431

Looking for a 214 kero and REI single burner anniversary stove as well as any Coleman born on date 10/77, 1/80
Quote
Lhoffm4coleman
Kansas John wrote:
@arryk spent some time working on the older green version, I think.  He might be of assistance if I’m remembering who I sold my broken one to.
 

Thanks John, I will reach out.
Quote
arryk
Greetings Programs
Im working on a Coleman Hot Water On Demand unit.  Its heating so well, it started to melt the venting slats at the top.  However, I cannot get it to pull water from the jug.  

1.  How do I tone down the heat so it does not want to melt its own housing?

2.  Am I looking to break free an impeller in the pump head?  If so, how does one go about opening it?

3.  Whats the secret to cracking open the unit housing?  I have removed the screws holding the side on, but cannot massage the side off.  I dont want to crack or break it.

4.  Is there a troubleshooting guide or repair manual out there?  I really like the concept, but for the infrequent use camp appliance, it seems quite finicky.  

5.  Is it practical to replace the 6v battery with a 12v system?  Is there a hack?  

I know I can just boil water over a stove, but Id like this to work too!

Thanks in advance...


Sorry I missed this, life has been...hectic. 

If it's that hot, I'm inclined, considering that it isn't pulling water, to think that your pump is getting weak. It should shut off automatically after a moment or two if it isn't moving water at all, so that could be another issue, 

My unit has a weak original pump right now (trying to get the most out of it before I swap to a new one), and I can't run the unit on a table with the 5 gallon collapsible on the ground below it. The worn pump wont push the water that high at correct output, which gives water inside more time with which to absorb heat inside the exchanger. In that state, you have to run them dialed very low. With the jug at table height along with the unit, correct volume and operation are restored.

That would be the first thing I'd test in your situation.


If you think your impeller needs breaking free, or think that it needs cleaned, you can take the end off of the pump and have a look. Locate the end of the pump with the threaded  collar that attaches to the water jug, slide the collar back as close to the pump as it will go, and then look at the pump end on. On that end, you'll note 4 half moon cuts in the part that protrudes inside your water jug when you connect it up. Lay a screwdriver or an appropriate sized drill bit across those half moon cuts, apply pressure, and unscrew, and that whole end will unscrew from the pump, exposing part of the impeller.

As to the unit housing. There are screws in the side of the case, those have to come out. Some units have a single screw in the bottom of the case, some do not. Some units have a single screw on the face of the unit below the control knob with the control sticker over the top of it. All units have 4 screws in the compartment that the propane bottle fits in, 2 to the left and 2 to the right, the units with the single screw on the bottom screw into the insert that these 4 screws hold in.

If you're going to crack a unit open, be patient, take your time, and be gentle with the original control decal, it you peel it carefully and stick it to a brand new plastic bag and stash it until you need it, it can be reused. Set it in the sun a bit and get it hot if need be.

There is no troubleshooting guide out there at all, beyond experience and youtube/the internet. Coleman didn't even service them. If you had one stop working under warranty, they'd tell you to take detailed pictures of the unit and then smash it and retake photos and send them to coleman, and they'd send you a brand new unit.

The 12v/6v thing is a pain to a degree. I camp 12v everything. What I've found is it pays to have multiple ways to charge and power the unit. I carry a pair of batteries with me at all times. I use the 6v gamefeeder batteries from wallyworld, label them, and replace them every couple years. 

I have a 6v wall charger for direct charging the batteries, the 12v auto plugin charger that comes with the unit, and the 12v wal wart charger for the unit. Also, if you put the batteries in series, you can recharge them with a 12v sealed lead acid battery charger. I did that a couple times over the years and it works fine.

If you have 12v, your best bet is to just recharge the unit from 12v when the battery goes low, or replace it with a second charged battery. All your other options are more of a pain.

One thing also to note, sealed lead acid batteries seem to be a bit temperature sensative, more so the older they are, and can cause your water heater to misbehave when cold. Keep a battery somewhere relatively warm overnite, or the unit itself. When that misbehavior begins to happen at 55 degrees F or so its time to replace those batteries,
Arryk: Newbie but learning
Quote


...
...
Welcome to the Coleman Collectors Forum, an international forum of Coleman enthusiast and collectors, as such people from all over the world come here to read about Coleman collecting, repair, and to meet and make friends. The pages contained here are intended for the use of amateur collectors and people interested in Coleman collecting, restoration and repair as a hobby. It goes without saying to refrain from political posts, personal attacks and inflammatory posts.

Please note, all postings are the personal opinions of the members posting, the owner, administrators and moderators of the forum do not warrant the accuracy of posted information or endorse the safety of such.