DIY External Heater (56k!) - Page 5 - The Planted Tank Forum

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post #61 of 108 (permalink) Old 02-08-2008, 09:09 PM
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tried to get free samples last night they are unavalible any help anyone???
ps only asked for 2
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post #62 of 108 (permalink) Old 02-08-2008, 10:05 PM
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Quote:
Originally Posted by rat49f6 View Post
tried to get free samples last night they are unavalible any help anyone???
ps only asked for 2

They have gray ones and black ones. They told me that one of them is not available as a sample but the other is. Don't remember which and the email was at work. Try ordering the other color as a sample.

Edit: Or you can order them from www.mouser.com (but not for free).
Jim
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post #63 of 108 (permalink) Old 02-09-2008, 01:29 AM
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I picked up one of these mixing valves off eBay:



For combining the hot and cold water. The lower range is 85 degrees F, about the temp I wanted. It's a thermostatic valve that mixes the water to keep the output at the set temperature.
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post #64 of 108 (permalink) Old 02-09-2008, 01:36 AM
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they make mixing "computers" for darkroom water supplies that have digital temperature readouts that output exact temperatures all the time. but those are a bit pricey.. hehe.

Wouldn't 85 degrees and it being non-digital cause problems? Cause the water flow initially will be colder until the pipe is purged with new water from the tank...
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post #65 of 108 (permalink) Old 02-09-2008, 04:22 AM
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Wouldn't 85 degrees and it being non-digital cause problems? Cause the water flow initially will be colder until the pipe is purged with new water from the tank...
Well, this'll be a discus tank so the warm water is OK. Plus, it'll lose some heat travelling from the water source downstairs, the 30 ft or so to where the tank is.

I'll set it up to dump the first 30 seconds or so of water directly into the drain.
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post #66 of 108 (permalink) Old 02-09-2008, 08:07 PM
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Just order as many as you want from www.mouser.com ; they're not expensive.
I have all the parts needed except for the Cord Grip... and decided i'm going to order it from them? The problem is i'm not sure which one to order...i'm gonna be using an eheim jager 150 watts.... help please
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post #67 of 108 (permalink) Old 02-10-2008, 03:15 PM
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Originally Posted by lemuj View Post
I have all the parts needed except for the Cord Grip... and decided i'm going to order it from them? The problem is i'm not sure which one to order...i'm gonna be using an eheim jager 150 watts.... help please
Try getting free ones first....

If that fails you can buy them here:

http://www.mouser.com/Search/Product...DuemVfoA%3d%3d
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post #68 of 108 (permalink) Old 02-11-2008, 08:59 PM
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I've put together an external heater very similar to the design here. I used a heyco fitting to attach the heater. I tightened it down all the way and it seems to be very snug on the heater. It is leaking pretty good around the heater. I think I just used the fitting one size too big. I have the next size down as well, but they don't have the same thread size. Has anybody had an issue like this?
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post #69 of 108 (permalink) Old 02-12-2008, 02:58 AM
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you use the heater listed in this thread? maybe your heater is skinnier?
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post #70 of 108 (permalink) Old 02-12-2008, 12:40 PM
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No, I used a different heater, but it has a 7/8" diameter which I think is about the same as most heaters. I think the cord grip fitting I used is bigger. What size did you use?
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post #71 of 108 (permalink) Old 02-12-2008, 02:34 PM
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the one we use is the largest they make? up to .59" to 1", maybe you didn't tighten it enough? or maybe you need to use some plumbers goop or Teflon tape around the heater to get a better seal? Or maybe your cord grip is defective?
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post #72 of 108 (permalink) Old 02-12-2008, 02:38 PM
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I am pretty sure the one I used is bigger than that. Not sure though. I tried using some teflon tape but it didn't make much difference. I am going to try the smaller cord grip, the problem is getting an adapter for the different thread size of the two cordgrips. The one I have has 1 1/4" threads and the smaller one looks about one inch. I am assuming I can find a reducer that will work.
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post #73 of 108 (permalink) Old 02-12-2008, 02:53 PM
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http://pvcfittings.com/

I've used that place before, tons of selection of hard to find fittings. And mouser carriers the whole Heyco line

http://www.mouser.com/Search/Product...vhusiXyg%3d%3d

is the next smallest at .450" to .709" and it says its 3/4" NPT so you'd need a 1 Spigot x .75 FPT reducer bushing found here:

http://www.flexpvc.com/cart/agora.cg...r-Bushings-FPT
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post #74 of 108 (permalink) Old 02-12-2008, 06:21 PM
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I don't think I explained myself well. I used the heyco cord grip at .865" to 1.260". It must be just a hair to big. I have the next size down already, but the problem is the bushing for the large cordgrip has already been glued in, so it is either start the project over or find a fitting that can reduce the thread size of the existing bushing. I found something at Home Depot this afternoon that I think will work as long as my guess on the new thread size is right. I assumed 1" since the fitting is at home. I hope that is right and I hope that fixes it.
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post #75 of 108 (permalink) Old 02-13-2008, 02:47 AM
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ahh, yes. The one we have linked and talk about in this thread is the .59" to 1" with 1" NPT fitting.
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