Cheap ($18) hot water circulating pump -- anyone want to try using for aux pump? - PeachParts Mercedes-Benz Forum

renaissanceman · #1 05-19-2015, 05:04 PM

I was thinking on my eventual redneck solar/waste oil powered hot tub (

) and was looking up hot water circulators, and lo and behold:

Solar DC 12V 24V Hot Water Circulation Pump Brushless Motor Water Pump 1000L H | eBay

or:

http://www.ebay.com/itm/Solar-DC-12V-Hot-Water-Circulation-Pump-Brushless-Motor-Water-Pump/171357570920?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D29907%26meid%3Da179b363896a4661a8677e2328b7 537f%26pid%3D100005%26rk%3D1%26rkt%3D6%26mehot%3Dag%26sd%3D181722213253&rt=nc

Which got me thinking on the high cost of the aux pumps on these cars. It has 1/2 inch inlet/outlet fittings, so it will be just about a perfect fit.

jay_bob · #2 05-19-2015, 05:10 PM

It's only rated for 100 deg C water, and does not say it's good for glycol.

Not willing to chance my cooling water on this...

renaissanceman · #3 05-19-2015, 05:12 PM

Yeah, but if someone has a beater and wants a project...the coolant should not be over 100C often, right?

renaissanceman · #4 05-19-2015, 05:16 PM

The second one is made of PPS plastic, which according to this publication is completely compatible with ethylene glycol.

HappyHappy · #5 05-19-2015, 05:23 PM

Quote:

Originally Posted by renaissanceman

Yeah, but if someone has a beater and wants a project...the coolant should not be over 100C often, right?

What is the potential cost of a failure? Looks like you've got a OM603 with an alloy head, a no-name cheap plastic pump with a claimed 100C upper temp limit sounds like a quick way to a $2000 cylinder head overheating event, all to save not even a hundred dollars? Bosch 001-835-13-64, listed on Peach Parts for $90 and Amazon for $55 and up

Coolant temps can easily get over 100C in traffic, climbing a grade etc.

renaissanceman · #6 05-19-2015, 05:48 PM

Quote:

Originally Posted by HappyHappy

What is the potential cost of a failure? Looks like you've got a OM603 with an alloy head, a no-name cheap plastic pump with a claimed 100C upper temp limit sounds like a quick way to a $2000 cylinder head overheating event, all to save not even a hundred dollars? Bosch 001-835-13-64, listed on Peach Parts for $90 and Amazon for $55 and up

Coolant temps can easily get over 100C in traffic, climbing a grade etc.

Yeah, like I said, I have a brand new one in my car, and am not planning to use it. Just throwing out ideas. Didn't realize this would start a firestorm. Sorry I brought it up.

HappyHappy · #7 05-19-2015, 06:11 PM

Quote:

Originally Posted by renaissanceman

Yeah, like I said, I have a brand new one in my car, and am not planning to use it. Just throwing out ideas. Didn't realize this would start a firestorm. Sorry I brought it up.

I don't think it's a firestorm, just people responding to aspects that maybe weren't fully considered, that's all. Completely unrelated, but there are now a wide variety of DC powered small pumps that perform perfectly for irrigating clandestine medicinal crops using drip emitters though! A pump, a PWM controller, digital timer and the Li-ion 12 volt battery and great things can happen.

vstech · #8 05-20-2015, 08:19 AM

Another flaw with this pump as an aux pump would be pressure... The cooling system has over 20 psi on it until the cap burps... What is the cheap pump rated for? The garden hose connections make me think it's designed for lift use only... Could it work? Sure...

JamesDean · #9 05-20-2015, 12:39 PM

I think I paid $60 for the new one in my 91 300D...They aren't that expensive...unless they've gone up in price..

I have seen Bosch aux water pumps for Audi's in that price rage...looked awfully lot like the MB variant.

renaissanceman · #10 07-22-2015, 03:30 AM

I picked one up to play with for the solar hot tub. It is surprisingly well made, actually.

Zacharias · #11 07-22-2015, 10:26 AM

Quote:

Originally Posted by JamesDean

I think I paid $60 for the new one in my 91 300D...They aren't that expensive...unless they've gone up in price.

On PP, you currently have a choice of MTC for $81.25 or OE for $678 (cough, gag).

Given the MTC track record on the monovalve inserts, I wouldn't be excited about this choice....

m1tch · #12 07-22-2015, 07:34 AM

Fit a Davis Craig pump.

Zulfiqar · #13 07-22-2015, 10:31 AM

Quote:

Originally Posted by m1tch

Fit a Davis Craig pump.

that would overwhelm all the hoses in the system..

dude99 · #14 07-22-2015, 10:36 AM

Quote:

I don't know why there is no pump on the 240s

I always assumed it had to do with the manual climate controls. Maybe the manual valve the 240's use is less of a restriction than the monovalve so it requires less pressure to flow the same amount of water. Just a theory though.

crazy4diesel · #15 07-22-2015, 11:28 AM

Do I even need an AUX pump? I've fitted a manual climate system from a Euro spec 300TD into my car.