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Old 05-15-2021, 01:46 PM   #1
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Coolant/hot water recirculation pumps - recommendations?

Hi All

I need some help choosing recirculating pumps.

I'm designing my hydronic heat system around a central thermally isolated coolant (heatant?) repository, which I will transfer heat into from multiple sources (diesel heat, PV load dump, later possibly engine heat or direct solar).

I'll extract heat for water, recirculating shower heat loss supplement, floor heating and water-to-air heat exchangers. Later possibly also for engine heat.

The coolant itself will be a regular glycol based fluid.

So, ideally I'd like to have a low power, low pressure, low voltage (12 or 24VDC) pump that is coolant resistant. I could spring for 120V if I had to, but I prefer a system that requires no AC to be always on.

On Amazon you can buy a regular household recirculating pump for $60 or so, and that would probably work, but I have no idea if the seals would be coolant resistant. For example this one: https://www.amazon.com/BOKYWOX-Circu...1&rps=1&sr=8-5

Also, I'll be running quite a few circuits, so I would need a valve system, or, several smaller pumps. The latter has my preference. But I am reluctant to buy a series of these plastic (and plastic-y) and expose them to 200F glycol 24/7 only to learn that they break down into a puddle of goo at the most inconvenient moment.

Even though some of them are listed as 100 degrees C compliant:
https://www.ebay.com/itm/29407796258...cAAOSwwXBgWB1x

So... Anyone with hot water/hot coolant pumps (electric ones with hose or thread adapters, a water pump from a car isn't really an option).

Thanks!

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Old 05-15-2021, 01:57 PM   #2
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Coolant booster pump

Used on buses. 12v and 24v. Can be purchased from many sources.

William
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Old 05-15-2021, 06:31 PM   #3
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I have used Toyota Prius magnetic coupled coolant pumps..
Why no automotive pump??
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Old 05-15-2021, 09:48 PM   #4
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Thanks guys for your recommendations. I meant not a belt driven water pump, like so:

https://www.kbb.com/car-advice/does-...ew-water-pump/

I wasnít aware of pumps like these:

https://www.google.com/aclk?sa=l&ai=...ww8InAc&adurl=

Iím going to try to find a couple of these, thanks for the great tips!

Bert
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Old 05-15-2021, 10:16 PM   #5
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Yes there are two versions.. I think the older one was slightly handier but forgot why..they do not handle running dry.

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Old 05-16-2021, 07:25 PM   #6
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Thanks for the info. I calculated that I need 11 PSI (around 5ft hd) at 2.2 GPM for my primary circuit, and 2 PSI at 1.1 GPM for the second.

I had a hard time finding pumps that actually have their specs published. I found some data on Bosch pumps:

http://212.113.105.12/library/BOOKS/CAR/BOSH-pumps.pdf

They have the flow, but the pressure delta is only 100 mBar, i.e. 1.45 PSI. Well, it is not a static number, the PAD version starts off at 200 mBar, and does 150 at 500 l/h.

So I bought one of these to experiment with (the Topsflo TL-B10-B24-0905):

https://www.ebay.com/itm/202315860343

Based on the spec, it should do pretty much exactly 2GPM at 1.5m i.e. 5ft of head. It is also rated at for 105C, and Topsflo seems to be a company that actually exists:

http://www.topsflo.com/brushless-dc-...s-dc-pump.html

It could still be a knockoff, who knows. MMMV.

If it works, I'm going to buy 5 or so in total. I was going to buy also one of the prius pumps, but I can't find any specs and I'd like to keep as much as possible at 24V.
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Old 05-20-2021, 08:02 PM   #7
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Okay, this little guy arrived. I donít think he has the oomph but letís give him a shot...
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Old 05-20-2021, 11:41 PM   #8
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Quote:
Originally Posted by Bert06840 View Post
Attachment 57679

Okay, this little guy arrived. I donít think he has the oomph but letís give him a shot...
I think I have the exact same pump. Be very careful not to torque the fitting, apparently they snap off easily.
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Old 05-30-2021, 12:57 AM   #9
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Quote:
Originally Posted by Bert06840 View Post
Hi All

I need some help choosing recirculating pumps.

I'm designing my hydronic heat system around a central thermally isolated coolant (heatant?) repository, which I will transfer heat into from multiple sources (diesel heat, PV load dump, later possibly engine heat or direct solar).

I'll extract heat for water, recirculating shower heat loss supplement, floor heating and water-to-air heat exchangers. Later possibly also for engine heat.

The coolant itself will be a regular glycol based fluid.

So, ideally I'd like to have a low power, low pressure, low voltage (12 or 24VDC) pump that is coolant resistant. I could spring for 120V if I had to, but I prefer a system that requires no AC to be always on.

On Amazon you can buy a regular household recirculating pump for $60 or so, and that would probably work, but I have no idea if the seals would be coolant resistant. For example this one: https://www.amazon.com/BOKYWOX-Circu...1&rps=1&sr=8-5

Also, I'll be running quite a few circuits, so I would need a valve system, or, several smaller pumps. The latter has my preference. But I am reluctant to buy a series of these plastic (and plastic-y) and expose them to 200F glycol 24/7 only to learn that they break down into a puddle of goo at the most inconvenient moment.

Even though some of them are listed as 100 degrees C compliant:
https://www.ebay.com/itm/29407796258...cAAOSwwXBgWB1x

So... Anyone with hot water/hot coolant pumps (electric ones with hose or thread adapters, a water pump from a car isn't really an option).

Thanks!

Check out a solar site. I'm talking pre PV. Hot water pumps were a hot item back in the day (1960s thru 1990s, "solar" pretty much meant hot water or hot air, still does to some people)
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Old 05-30-2021, 10:43 AM   #10
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I use multiple Davies Craig pumps . Quiet , magnetic, and dont pull too much juice. My bus also has its original heater pump in it as well
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